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pkorzeniewski 23 hours ago [-]
Voyager 1 & 2 is one of my favourite human science achievements, not even so much from technology standpoint, as it's relatively simple compared to what we have now (although that's one of the charms), but just the fact that it's so far away, it still more or less works long after the scheduled mission end time, we can communicate with it and despite all the modern technology progress, it would take decades to catch up. Absolutely amazing and inspiring!
zitterbewegung 22 hours ago [-]
A large amount of Voyager 1 & 2 's success isn't just technological it is the ability to take advantage of a specific planetary alignment for a gravity assist [1] that can only occur every 175 years [2] .
Every 20 years, Jupiter and Saturn are in position for a gravity assist, which allows you to reach half the outer solar system. In the 1970s, Uranus, Neptune and Pluto were all in the right half.
brador 7 hours ago [-]
I wonder what the optimal most fastest speed out of the solar system gravity assist path ever possible is and when that occurs?
joe_mamba 22 hours ago [-]
Fingers crossed, if we manage not to blow each other up until then, we have 126 years to go till we can try again.
mememememememo 18 hours ago [-]
Ideally cattle not pets. We are continually shooting stuff out and in 126 years it'll be as nerveracking and watching a train departure, but still exciting knowing the train is going further.
gus_massa 4 hours ago [-]
Good idea, but it's hard to get funding for cattle, people pay more for pets perks.
From another comment Jupiter and Saturn align every 20 years, so we have 5 rehearsal windows before the big one. What fancy projects can we do in them to get funding? Is it too late for the first one? Can we ask Elon to pay for the first two?
toomuchtodo 19 hours ago [-]
You might enjoy "A Canticle for Leibowitz" on this topic.
Don't forget that the mission planners figured out the "Grand Tour", calculating orbits and trajectories to slingshot around the Solar System. All with 1960s technology.
And scrambled to get two machines ready for the small window we had to take advantage of it.
jgalt212 20 hours ago [-]
Voyager, Apollo, and Hubble. Everything else NASA has done is a distant 4th place. And it's not like 4th place is trash, it's just that the big 3 are just so impressive.
pja 19 hours ago [-]
James Webb Telescope is up there with Hubble.
hparadiz 18 hours ago [-]
The rovers on Mars as well and New Horizons that went to Pluto. That is also at escape velocity so it will leave this solar system and most likely no human will ever lay eyes on it again. Voy 1 and 2 are still faster but hey they're all going in different directions so it's not exactly a race.
It was sent to Mars with a plan for 5 flights and a total of 7 or 8 minutes flight time. It ended up flying for over 2 hours in 72 seperate flights before it damaged itself with a bad landing. Not quite the "this thing is still doing science almost 50 years later" that Voyager can claim, but impressively engineered so it lasted way beyond it's initial mission plan.
Valakas_ 11 hours ago [-]
Never is a long period of time. Most likely we will, unless we go extinct.
throwaway27448 17 hours ago [-]
I don't think Apollo was very interesting or useful beyond cold war propaganda. Yes, we're capable of amazing things—but putting a man on the moon pales in comparison to basic healthcare funding. Why must we insist on wasting billions on histrionic braggadocio when we can't perform the basics of a modern society?
There's better things to dump instead of Apollo if you want a basically functioning society. Pick your couple of least favorite wars of choice in America's recent history. Apollo at least gave the country hope and showed that we could accomplish big ideas.
throwaway27448 9 hours ago [-]
But—we clearly can't accomplish basic things. That's my point
bdamm 2 hours ago [-]
No country has eliminated homelessness.
But only one country landed a man on the moon.
What is progress exactly?
salawat 7 hours ago [-]
And the reason why is those things must be profitable, and once you accept everything must be profitable, there is no ceiling to exploitation. Whereas with big things like Apollo, we didn't do it because it would make money. We did it because we decided it was the right thing to do.
Stop being a capitalist hellhole, and maybe try being a country that happens to operate under bounded capitalism, and just maybe, maybe, you can see some of that progress.
But what am I saying, cmon, that'll never happen.
lclc 6 hours ago [-]
The US in the 1960s was more capitalist than it is now (by governement size, spending, taxation, regulation and economic freeodm, too-big-to-fail, etc.).
There has to be profit first to be able to fund big things like Apollo. Profit is good.
13 hours ago [-]
mikkupikku 4 hours ago [-]
> ""useful"
Fuck all of it is useful besides satellites. Even the HST is only marginally useful; useful for fields of research which will almost certainly never have tangible benefits for life on Earth, built to satisfy our curiosity about phenomena too large and far from Earth to ever be put into use here on Earth.
Nonetheless, interesting? You're bonkers if a system like the Apollo program and all associated hardware isn't at least interesting.
saidnooneever 3 hours ago [-]
who wants to spend billions on peace and food for everyone if you can have pretty pictures of a barren wasteland millions of miles away. simple logic.
just be happy there's no cats in space to take pictures of otherwise all would be lost.
mikkupikku 1 hours ago [-]
Do you really believe we'd have "peace and food for everyone" if not for Apollo? Really?
Or is this an unserious argument you can use to nitpick anything? Why is my local government building another playground when they could be feeding African orphans??
GuB-42 5 hours ago [-]
I hate this argument. Every time there is some big and expensive technical achievement, someone is going to say that the poor are dying somewhere in the world. As if not going to the moon would have saved them.
I would argue that a healthy population is what allows great things like Apollo to happen. For such a program to succeed, we need lots of highly skilled people. Scientists, engineers, astronauts, tradesmen, managers, etc... Everyone needs to be at the top of their game. Such talent doesn't develop when you are struggling for your life, you need good conditions like health, confort and stability to be able to focus on your craft.
If we use life expectancy as a proxy, we could say that the US had a healthier population during the cold war than the USSR, and they are the ones who succeeded on the most ambitious project in the space race, despite the USSR having a head start. To me, it is not a coincidence.
Also, the cold war era was not just about space, it is also a time of major advance when it comes to medicine, life expectancy has seen a dramatic improvement, so we can put men on the moon and keep a population heathy.
alnwlsn 43 minutes ago [-]
I cannot take anyone making this argument seriously unless they are similarly furious at the expenditure on arts, humanities, historical preservation, luxury goods, entertainment, or other similar vanity projects.
Why is is that science and technology exploration ventures are held to a much higher scrutiny?
aorloff 17 hours ago [-]
Which country do you think got basic healthcare funding right ?
throwaway27448 17 hours ago [-]
Relative to what, the US? I'd say the thirty wealthiest countries on the planet... except us.
indecisive_user 12 hours ago [-]
How do you define wealthiest countries?
Picking from top GDP per capita, I'm not sure that UAE or Qatar are countries to look up to.
Gud 11 hours ago [-]
At least they have a better healthcare system
eru 9 hours ago [-]
You only asked about healthcare.
GuB-42 5 hours ago [-]
Since we are talking about the cold war: USSR.
They had pretty good results post WW2. The problem is that they ended up lagging behind the western bloc because of a lack of resources and innovation. Basic healthcare doesn't mean much if you don't have good treatment in the first place. It is a common problem with communist countries, they usually have good access to healthcare, but they don't have the resources to give proper treatment.
skilled 13 hours ago [-]
Norway
stx5 15 hours ago [-]
China
andai 23 hours ago [-]
>despite all the modern technology progress, it would take decades to catch up.
Could you elaborate on this?
wongarsu 22 hours ago [-]
Take decades to catch up to the location of either voyager probe. The probes have be traveling for a long time. They have also taken advantage of a rare planetary alignment that allowed them to visit a lot of planets and get gravity assists from them (converting a tiny portion of the planet's angular momentum into orbital speed for the spacecraft)
anovikov 20 hours ago [-]
Won't ion engines power by something like Kilopower reactor let us do better?
bragr 19 hours ago [-]
Bunch of napkin math: you'd need something like 10 kilowatts and 140 km/s detla-v to catch up to Voyager in a decade, assuming a New Horizons equivalent Earth escape velocity. The amount of xenon is technically possible, however even assuming impressive 8000 Isp thrusters, your fuel mass fraction ends up being 90+% fuel which doesn't leave a lot of mass for that reactor and radiators.
A 20 year intercept would be pretty reasonable though. It needs about 15 km/s delta v after that NH style escape, about a kilowatt of power, and maybe a 25% fuel mass fraction at 6000 Isp. That's all very reasonable by current standards.
jandrese 16 hours ago [-]
Is that including a Jupiter/Saturn assist?
bragr 16 hours ago [-]
No, that's more than napkin math but I feel the numbers stand for themselves that we can't really do better than decades. A few km/s won't change that.
anovikov 12 hours ago [-]
I understand that celestial mechanics are involved, because "stuff in space do not fly on straight lines", but why is the delta V budget 10x smaller for 2x more time? That feels counterintuitive :/
cedilla 22 hours ago [-]
Voyager 1 and 2 are 25 and 21 billion kilometres away, respectively.
Even if we built a rocket just designed to get stuff as far away as quickly away as possible, it would take decades to catch up to where they are now.
Narishma 22 hours ago [-]
Could we even catch up to them at all with the current propulsion technology? Not only did they have decades of head start but they took advantage of a unique planetary alignment that I don't think will come back around anytime soon.
vikingerik 22 hours ago [-]
Yes, easily. The alignment doesn't really matter for that. Almost all your speed gain comes from just Jupiter. Saturn is 30% the mass and 2/3 of the orbital velocity, so your gain from Saturn is only 20% of what you can get from Jupiter (and also your potential gain is limited by a minimum approach distance greater than the rings, or you'd hit them.) And the ice giants are slower and smaller yet; Voyager barely gained from Uranus and actually slowed from Neptune since it wasn't routed to gain speed there.
New Horizons achieved 80% of Voyager's velocity with just Jupiter, and it wasn't really trying to optimize for speed, it approached Jupiter only to 10 million km (over 100x greater than the planet's radius.) A probe dedicated to a fast slingshot past Jupiter could easily overtake Voyager. We haven't had any need to try, unless one of the missions to specifically study the heliopause-interstellar area happens. It would still take a while to catch up to Voyager's head start, but it's doable.
The alignment for Voyager was captivating, but it really wasn't as important as people typically think. Jupiter alone can get you anywhere and launch windows for it come every 12 years. If the four-planet alignment hadn't happened then, realistically we would have just done separate Jupiter-Uranus and Jupiter-Neptune missions.
gautamcgoel 22 hours ago [-]
I assume OP means that a probe launched today would take decades to exit the solar system.
22 hours ago [-]
whatrocks 16 hours ago [-]
Yes, yes! I got really into the Voyager-inspiration vibes for a while and wrote this little short story about a secret "Voyager 3" mission - thought you might enjoy it: https://f52.charlieharrington.com/stories/voyager-3/
trvz 22 hours ago [-]
They are dangerous and reckless. They were also done in the name of humanity, but without humanity’s consent.
I despise the naive scientists who did them as much as those who brought the damocletian sword of nuclear weapons on us.
fanatic2pope 22 hours ago [-]
Earth's "radio bubble" is well over 100 light years across now. If there are aliens out there, they are probably already on their way to ask us in person why Ross, the largest Friend, doesn't simply eat the others.
dcanelhas 12 hours ago [-]
After the transition to digital TV our broadcasted signals mostly look like noise, though. Maybe an outside observer would assume that our civilization ended sometime in 2010.
eru 9 hours ago [-]
You can still see from far away that our planet's atmosphere has a very unusual chemical composition that's far out of equilibrium.
We are already using spectroscopy to gain insights into the chemical composition of exo-planets, and we have barely begun doing this kind of research. In even just a few decades we'll be massively better at this.
krapp 22 hours ago [-]
Radio signals do weaken and dissipate over time and space. Broadcast signals could fade into the cosmic microwave background in a few light years depending on their strength. The sci-fi trope of aliens picking up Earth tv and radio just isn't plausible.
dheera 10 hours ago [-]
Imagine how far technology has come in 100 years. Then imagine if the alien had just a 1 million year head start to technology. 1 million years is less than 1/1000 of the age of the universe earlier.
We have literally no idea what technology the alien could have.
mrguyorama 1 hours ago [-]
The aliens have the same physics we do. Science isn't magic. Without quite literally having to replace everything we have known or discovered in the past 250 years from entropy to electromagnetic theory to gravity to motion with brand new theories that somehow equally explain all known phenomenon while also allowing lots of outright magic, no, the aliens are not able to collect radio waves from below the noise floor.
TheSpiceIsLife 8 minutes ago [-]
[dead]
krapp 6 hours ago [-]
Maybe there are aliens out there so advanced that they could be reading our screens right now in realtime from across the galaxy using some weird post-quantum silly sauce we can't even comprehend. But it doesn't seem likely given what we do know and observe, at least not to me (based mostly on the Fermi Paradox and thermodynamics) that there is someone 100 light years away teasing I Love Lucy from the CMB. It seems less likely that they would be able to pinpoint our location based on that, and try to annihilate us.
exe34 21 hours ago [-]
And in that light, you're worried two blocks the size of a small car will get picked up on the alien's hyperspace scanners?
bananamogul 20 hours ago [-]
Yet we spend tax dollars trying to do the same thing.
kibwen 20 hours ago [-]
No, we don't. If you're talking about SETI, that's looking at radio signals. If you're talking about killer asteroid early-warning detection, we generally don't have the capacity to reliably detect voyager-sized asteroids even in our own solar system, let alone in interstellar space.
krapp 21 hours ago [-]
I'm not, but other people seem to think it's a problem worth worrying about.
dcminter 20 hours ago [-]
I think you're not appreciating how big space is. They're not going to be near any star for thousands of years - and near here is still very distant. If we're still around then, we'll probably be able to look after ourselves.
jacquesm 15 hours ago [-]
The chances of either Voyager ending up in the hands of intelligent aliens are remote compared to the chances of us blowing ourselves up. Be happy that there is at least a tiny possibility of a tombstone for a race which once upon a time aeons ago showed some promise. Personally I think they should have stuck a mummy in there.
They're not even wrong about both their complaints. The "damocletian sword of nuclear weapons" is actually what's been keeping humanity from setting the planet on fire for the past 60+ years.
mikkupikku 4 hours ago [-]
There is zero empirical evidence that aliens actually exist. All the arguments for why they should exist despite this lack of evidence are borderline theology.
wongarsu 22 hours ago [-]
I assume you are against them due to the silent forest hypothesis? Better not announce ourselves, because anything out there might not be friendly to us?
cyberax 22 hours ago [-]
The dark forest hypothesis assumes that it's easy to travel between stars, so interstellar conquests are possible. But it doesn't seem to be the case.
There are no material goods that can justify the material and energetic expense of any interstellar travel. You'd be far better off just using a particle accelerator to forge any chemical element and then assemble them into molecules using nano-replicators.
The best you can do is to send information, possibly with the help of gravitational lensing.
Sci-fi mode on: given that the potential galactic civilization is going to be information-based, who's to say the Earth is not already under attack? An interstellar fleet of large invasion ships with soldiers is not feasible, but a small drone with an AI that connects to terrestrial networks and steers the civilization towards collapse is possible. I'd start investigating if TikTok algorithm developers got some nudges from a weirdly knowledgeable source.
TeMPOraL 10 hours ago [-]
> The dark forest hypothesis assumes that it's easy to travel between stars, so interstellar conquests are possible. But it doesn't seem to be the case.
Wrong. Dark Forest isn't about conquest, it's about preemptive strikes.
The Dark Forest hypothesis assumes that travel between stars is hard - more importantly, that even communications at those distances is hard - specifically, that it takes a long time, which prevents building trust. This, combined with one other assumption: that technological progress makes unpredictable jumps ahead, makes the conclusion fall out straight from basic game theory.
So per the Dark Forest hypothesis, if you spot a primitive agrarian society sending a "hello" to you with smoke signals, you're better off lobbing a nuke at them in response - because otherwise, should you send a friendly "hello back" instead, you may discover that while that message was in flight, they underwent a triple industrial revolution, and shot a magic proton bomb at you.
Why would they do that, you ask? Because from their POV, at any moment you can have a sudden technological breakthrough and start dragging black holes at them or whatever. Point being, it's best for them to get rid of you, while they still can.
(People get too fixated on the forest metaphor XOR the sci-fi parts, but it's really neither; the second book of the trilogy pretty much spelled out the whole rationale like a math textbook, in case anyone missed it after half of first book making analogies to it with ants and history of modern China and such.)
(ETA: what's the justification for "sudden technological jumps" assumption? History. Humanity had ~all the ingredients for the industrial revolution for centuries, and it's not clear why it happened when it did, and not a century or two earlier (or later). Then it happened, but the outcome wasn't "evenly distributed". Then the 20th century saw several large nations jumping all the way from pre-industrial agrarian societies to post-industrial peer superpowers, in a span of merely a few decades. The author writes extensively about living through that transition in the first book.)
cyberax 8 hours ago [-]
The ability to strike itself assumes easy interstellar travel. After all, if you can _destroy_ whole planets and stars, why not just send colonists immediately?
Or maybe pre-emptively sterilize everything to make sure your eventual expansion encounters no issues.
Moreover, if your first instinct is to strike while hiding, then your equilibrium state would be a civilization that is the most successful at wiping out everything around it, spread all over the habitable universe. Dark Forest just doesn't work from the game-theoretical perspective.
dbacar 21 hours ago [-]
That sounds like an invisible malevolent force trying to destroy us, himm, sounds familiar :).
IncreasePosts 17 hours ago [-]
That's why I never understood sci Fi nerds obsession with outer space, as opposed to inner space. Humans sit about half way between the biggest and smallest things in the universe. Instead of exploring the cosmos, which takes tons of energy and is almost entirely empty, we could be exploring the space between atoms and building worlds without our own world. It is also almost entirely empty, but the energy costs to construct anything would be close to zero.
TeMPOraL 10 hours ago [-]
Observe that ~all sci-fi stories happening in outer space actually don't happen in deep space - there's always a warp drive or a stargate or such used to skip the boring, empty parts, and jump straight to habitable planets and peculiar space phenomena.
It's the same as with sailing stories and reality - the interesting parts are everything that isn't the open blue sea.
defrost 9 hours ago [-]
~all is ambitious.
Dark Star is one film that directly addresses the long voyage insanity of deep space;
Similarly with sailing films, particularly documentaries, there are films that focus more on the journey than the endpoints. eg: (IIRC) the Kon-Tiki (1950) doco had a lot of mid ocean time.
the_af 15 hours ago [-]
> That's why I never understood sci Fi nerds obsession with outer space
I'm sure you do understand it. I mean, sure, the other things you mention are also interesting, but mankind has been awed by a starry night's sky since we were able to look up. We gave names to the arrangements of bright things in the skies and imagined gods in them, and navigated by them. The are awe-inspiring.
It's really a human thing, not a scifi nerd's. It's impossible not to look at the stars and wonder. It's human nature.
TeMPOraL 10 hours ago [-]
> It's really a human thing, not a scifi nerd's. It's impossible not to look at the stars and wonder. It's human nature.
Judging by social media, half the population has an unhealthy obsession about travel and tourism. It's not hard to connect dreams of space to interests of most people here: most stars you look at have planets around them, now imagine some of those are like Earth, and now suddenly this is a place to on a cruise to, to have new pictures to post to Instagram.
gambiting 21 hours ago [-]
>>There are no material goods that can justify the material and energetic expense of any interstellar travel.
Material, no. but we know with absolute certainty that Earth will stop being habitable for humans at some point. So assuming any intelligent race, human descendent or otherwise, still exists on this planet, it will have to eventually move. It's just pure luck that we evolved when we did. But there are valid reasons for interstellar travel(other than you know, pure curiosity).
kibwen 20 hours ago [-]
I wouldn't characterize it as "moving". Any excursion outside of the solar system will not be done by anything resembling a modern human, full stop. It may be plausible to send some sort of robot with some sort of nanomachine hoo-hah off in the direction of a nearby star, to seed life there. But no living human will ever leave the heliosphere.
the_af 15 hours ago [-]
Even if leaving the solar system, or whatever system a sentient race exists, were possible, going to war with another sentience in their home turf (which, remember, must first overcome the near impossible hurdles of getting there to begin with) is so unlikely it makes invasion fears absurd. I think the dark forest theory is groundless paranoia.
Scifi usually bypasses this by breaking the laws of physics, for the sake of storytelling.
TeMPOraL 10 hours ago [-]
People don't get dark forest at all.
Dark Forest isn't about hiding from invasion. It's about hiding from getting preemptively sniped by someone else, worried that one day you may find a reason and a way to snipe them.
For this to work out you don't need interstellar colonization to be plausible - merely the ability to accelerate a rock to a significant fraction of the speed of light is enough, and that's definitely much closer to science than fiction.
the_af 6 hours ago [-]
It's still very impractical though. Sniping everywhere that intelligent life might exist is very low probability, low stakes, and for what reason? You don't have any reason to kill anyone you're unlikely to ever meet. And with a weapon which, by the time it arrives, your civilization might be gone. And for what? You cannot compete for resources you cannot reach. War doesn't work like this, it requires anger and an adversary that you can meet in your lifetime.
Dark Forest also assumes aliens aren't curious and thrilled about other life existing out there. The one civilization we are familiar with wouldn't react like this. And we're talking about a very warlike civilization!
cyberax 15 hours ago [-]
It's a catch 22. If you want to preserve the Earth's biosphere or even biological humans, then you would need to move at least a ship the size of a small planetoid. That will support life for millenia that will be required for interstellar travel.
And if you can do that, then why bother with the interstellar travel? Just move to a higher orbit to survive the red giant stage. And then move closer to the stellar remnant, white dwarves will provide plenty of energy for trillions of years.
And if you manage to transcribe yourself into some kind of computing-based device, then why bother at all?
gambiting 7 hours ago [-]
I think moving a small planetoid and moving a planet are not really comparable technical challenges, are they? Even a small moon like Deimos you could probably move by attaching giant rockets to a side and pushing(absolutely absurd, but let's go with it). How would you move the earth with its atmosphere still intact? Is your rocket stretching out the entire way from the surface to the edge of space?
exe34 21 hours ago [-]
[flagged]
whattheheckheck 22 hours ago [-]
The vast space of everything seems to me that any intelligent life eventually discovers physics to get out of this dimension. Dune space feudalism is unlikely
ravenstine 20 hours ago [-]
Good thing those gold plates give aliens the wrong directions to Earth anyway.
16 hours ago [-]
dbacar 21 hours ago [-]
For some good portion of the earth's population, I dont think things would go worse than it is even if there were an alian invasion.
thegrim33 22 hours ago [-]
I'm firmly against METI, but the Voyagers aren't evenly remotely METI / risky.
srean 22 hours ago [-]
Elaborate please.
jonplackett 21 hours ago [-]
They read The Three Body problem
giantrobot 20 hours ago [-]
They read the Three Body Problem but forgot that light exists. For aliens with interferometers looking at Earth there's little question there's some sort of interesting active chemistry (life) here.
Theres no hiding that fact. If they're within about 100 light years they'll be watching the effects of the Industrial Revolution on the atmosphere. Even if they're don't know the exact cause the spectra of pollutants and rates of change will give hints the changes are unlikely to be from random natural processes.
Outside of 100 light years but pretty much anywhere in the galaxy (assuming interferometers capable of getting spectra of Earth) will know there's some sort of life here. Even if you want to assume some aliens don't recognize life as we understand it they'll at least see extremely interesting and varied chemistry.
The idea you're going to hide Earth's biosignatures is silly. Trying to hide our technology signatures is pointless. At about 70 light years any interested aliens will start seeing isotopes resulting from above ground nuclear testing.
kibwen 20 hours ago [-]
Telescopes aren't magic, and space is big. There are 100 billion+ stars in the galaxy. Within a 100 light-year radius, there are 27 ( https://en.wikipedia.org/wiki/List_of_star_systems_within_95... ). Nobody's looking at Earth. If any hypothetical civilization were to find our system, it would be by blanketing the entire galaxy in 100 billion drones and checking every single star, in which case the dark forest doesn't matter anyway.
giantrobot 15 hours ago [-]
First that's just star systems within 100 lightyears of Earth, systems with one of more gravitationally bound stars in them. There are thousands of stars within 100 light years of Earth. Most are red dwarfs but there's about a thousand F, G, and K class stars.[0]
While telescopes indeed are not magic, an alien species at least as advanced as us could have telescopes capable of not only finding Earth but gathering spectra from it. It's certainly no guarantee Earth would be found but there's no hiding from anyone looking. There's no masking the chemistry of life on Earth and likewise no masting techno-signatures in the atmosphere.
If they are at our current tech level, to "see" Earth, then Earth would need to pass in front of the Sun from their point of view. That means they would need to be somewhere in the same pane as the Earth's orbit.
giantrobot 3 hours ago [-]
That's a transiting detection, there's other detection methods for exoplanets. Even a coarse grained survey with a ground based traditional telescope can find our solar system thanks to Jupiter's gravitational influence on the Sun. Doppler shift's in the Sun's spectra come from Jupiter tugging at it gravitationally. With interferometry and coronagraphy spectra of planets in our system can be gathered without needing to see our system edge-on. Then of course for aliens on the ecliptic there's transiting spectra of Earth.
The number of techniques for detecting exoplanets makes the Dark Forest concept silly. There's no hiding our solar system from alien observation. For dedicated observers (at the right distances) there's no hiding the existence of life, the Industrial Revolution, or above ground nuclear testing.
saadn92 1 days ago [-]
The thruster fix is the part that gets me. They sent a command that would either revive thrusters dead since 2004 or cause a catastrophic explosion, then waited 46 hours for the round trip with zero ability to intervene. That's a production deployment with no rollback, no monitoring dashboard, and a 23-hour latency on your logs. They nailed it.
hnthrowaway0315 24 hours ago [-]
I'd argue that once you have a very well defined requirement doc that mostly kicks humans out of the picture, as well as a patient boss who doesn't want anything ASAP or "Tomorrow morning first thing", engineering is not that hard, and is almost...enjoyment.
KellyCriterion 22 hours ago [-]
> ASAP or "Tomorrow morning first thing"
like in "fast pacing environments" with "flat hierarchies" and "agile mindset"? :-D
prymitive 21 hours ago [-]
As ASAP As Possible
theGeatZhopa 20 hours ago [-]
As asap as possible or you can say rip in peace to yourself
armanj 23 hours ago [-]
A well defined doc evolves over time. it gets sharper with real-world scenarios, incidents, and experiments. Before Voyager 1, we didn’t have that kind of experience. You can’t predict everything upfront.
> Theory only takes you so far
y1n0 23 hours ago [-]
I’d argue that you must not be working on interesting problems if you think that “engineering is not that hard”
SpaceNoodled 23 hours ago [-]
I think their point is that the challenge becomes more enjoyable than tedious.
TeMPOraL 10 hours ago [-]
Most of us are working on problems that are boring and tedious, not hard.
hnthrowaway0315 20 hours ago [-]
That's the point. I haven't but I would like to, and I realize that the so called "engineering" problems I work on is NOT real engineering.
OK I was probably wrong about that "not hard" though.
trgn 23 hours ago [-]
Would sending voyager have been a real definite deadline?
wongarsu 22 hours ago [-]
Visiting this many planets was only possible due to a very rare alignment. It's a once a century event. That's why we sent two probes, not just one
reaperducer 23 hours ago [-]
Absolutely. You could wait decades or centuries for a useful planetary alignment.
vikingerik 21 hours ago [-]
Not really. Jupiter alone is good enough. Its huge mass accounts for almost all of the gain you get from any such slingshot. Launch windows from Jupiter to anywhere occur every 12 years. Voyager's alignment was captivating, but realistically if it hadn't happened, we would have just done separate Jupiter-Uranus and Jupiter-Neptune missions instead.
zerd 19 hours ago [-]
Based on the communication fix, they also didn't have a simulator, or tests, or complete source code, on a custom instruction set that wasn't well documented, so they had to reverse engineer how it worked. https://www.youtube.com/watch?v=YcUycQoz0zg&t=2366s
quotemstr 21 hours ago [-]
That was ballsy! But, sadly, it was a temporary hack. Both Voyager have degrading, unfixable thrusters. The rubber diaphragms in the hydrazine fuel tanks are degrading, shedding silicon dioxide (i.e. sand) microparticles into the thruster fuel. These particles are gradually clogging the thruster nozzles and reducing their thrust. Eventually, thrust will decline to the point that they could fire the thrusters all day long and still not impart enough momentum to point the probes at Earth. Once that happens, we'll lose contact with the probes.
They'd switched away from the primary thrusters in 2004 due to this degradation. Now the backups are so degraded that the primary thrusters are better again in comparison.
Thruster clogging will kill Voyagers in about five years if nothing else gets them first. The least degraded thrusters nozzles are down to 2% of their diameter --- 0.035mm of free-flow area remaining.
The Voyagers will probably celebrate their 50th anniversary, but not much beyond that. :-(
Kind of ignominious to be done in not by the inexorable decline of radioactivity but by an everyday materials science error of the sort we make on earth all the time. In the 1970s, we knew how to make hydrazine-compatible rubber. We just didn't use it for the Voyagers.
gpvos 11 hours ago [-]
They're still functioning after ten times of the Voyager's projected lifetime, I can't call that an error.
seanc 4 hours ago [-]
Upvoted. Sooner or later the Grim Reaper comes for us all.
bazzert 1 days ago [-]
There is a terrific documentary, 'Its quieter in the twilight', about the aging and dwindling team that still runs both Voyager missions
https://www.youtube.com/watch?v=F6L9Du_IFmI
pan69 23 hours ago [-]
> Video unavailable
> The uploader has not made this video available in your country
I'd love to watch this but unfortunately. My country being AU.
I think I watched it on Amazon Prime in the USA. I don't know if Oz has Prime or what rights they have.
I checked the usual sites on the high seas and it is available for instant download there too :)
chistev 23 hours ago [-]
Why do some uploaders make it unavailable in certain countries?
spike021 22 hours ago [-]
licensing probably
pbhjpbhj 21 hours ago [-]
But for an advert?
You can rent videos from YouTube, wouldn't you just make the video available but charge for it?
HugoTea 7 hours ago [-]
Licensing rarely makes sense
pramsey 23 hours ago [-]
Such a wonderful meditation on career and meaning and fellowship and purpose. I loved it.
manytimesaway 1 days ago [-]
Very depressing to see this next to the "LinkedIn uses 2.4GB of RAM" post.
divbzero 1 days ago [-]
Any website that uses more memory than Voyager 1 should be considered bloated.
amiga-workbench 24 hours ago [-]
There's almost certainly less than 69KB of useful human-readable information on any given page.
tombert 23 hours ago [-]
I was actually a bit curious how much HN uses, since it's probably the lightest site that I frequent.
According to Brave's dev tools, looks like just shy of about 90kb on this comment page as of the time of this writing.
Obviously some of that is going to be CSS rules, a small amount of JS (I think for the upvotes and the comment-collapse), but I don't think anyone here called HN "bloated". Even that one page wouldn't fit on Voyager.
Huh, fair enough. I was looking at the network console in the browser and it said 89KB.
Almost certainly my fault...sorry!
basilikum 20 hours ago [-]
Our comments don't really contradict each other. The page size without any linked documents like an external style sheet grew to 140KB after your comment. But just the text is 30KB.
winnie_ua 19 hours ago [-]
That's only HTML but when it is loaded in chromr it is more than 40 MiB.
halapro 5 hours ago [-]
Downloaded data != memory usage
You're comparing apples to apple trees
rkagerer 23 hours ago [-]
There is more information in a typical, single page of comments here than there is on the average webpage. And I'd say a far higher signal to noise ratio (though depending on the topic discussed some will disagree).
ksymph 21 hours ago [-]
This page is only ~30kb. I wonder where the extra ~60kb you're seeing is coming from?
reaperducer 23 hours ago [-]
I was actually a bit curious how much HN uses, since it's probably the lightest site that I frequent.
I use an iPhone 5 as an iPod. HN is one of the few web sites that still works with iOS 10.
1718627440 2 hours ago [-]
HN used to work fine on an Nokia classic phone until last year. Sadly it doesn't any more, since they switched the CA to something that is not in the OS root trust. If HN wouldn't enforce HTTPS, it would still work fine.
qingcharles 15 hours ago [-]
The SSL certs are probably going to be a problem before HN changes its rendering.
jprd 23 hours ago [-]
Nice. Do you just use your 5 as a stationary iPod, or do you dual-carry with a modern device as well? Curious on if you also use it to wi-fi the web on your local LAN periodically too, of it that was just a periodic test to check if HN worked.
reaperducer 22 hours ago [-]
I use it around the house to Airplay music to various devices.
A number of things don't work, or work in unexpected ways, mostly because Apple doesn't allow me to log in to iCloud with such an old phone.
I can't control lights with the Home app. But Airplay works fine. The phone doesn't know what a HomePod is, but it shows up with a regular generic speaker icon, like the AirMac I have hooked up to my stereo.
Sometimes I have a few minutes to kill, and I pick it up to look at HN. The New York Times web site starts to work, but the login page doesn't load at all. WSJ blocks me at a "verifying the device" screen. WaPo half works. eBay works some, but no pictures. Ditto for Wikipedia.
There's a lot of things you take for granted on a new phone that you only realize when you're using an old phone. Like you didn't used to be able to quickly scroll an entire web page it's only a screen at a time in iOS 10. You can't grab the scroll bar on the side and move it, either.
And 99.9999% of people don't realize the genius of the camera island. It makes it so much easier to pick up the phone if one end is elevated a bit. With a completely flat phone, you end up dragging/scraping it along the table in order to grip it, which scuffs the surface. And if the table is really smooth, it's surprisingly difficult to lift the phone straight up.
Any development team larger than Apollo programming team of 350 is overstaffed.
22 hours ago [-]
reaperducer 23 hours ago [-]
Any development team larger than Apollo programming team of 350 is overstaffed
We put a man on the moon mostly with pencils and slide rules.
Today we have massive data centers full of "AI" supercomputers, and we get… TikTok?
qingcharles 15 hours ago [-]
Surprising fact I just noticed about the next Moon landing attempt -- it'll take up to 22 launches to get everything into space needed for the attempt.
TeMPOraL 10 hours ago [-]
That's good, actually. We need to develop the capability to stage/assemble in-orbit, as this would relax a lot of hard constraints on size and complexity of the missions.
jacquesm 15 hours ago [-]
Vindication, finally.
jagged-chisel 1 days ago [-]
Takes a lot of resources to track your users rather than just cruising through space
kermatt 22 hours ago [-]
Voyager only needs to track itself. Plus, no ads.
echelon 24 hours ago [-]
It takes a lot to deliver value at velocity with a team of engineers that couldn't give a damn about the product and just want to get a paycheck, move up the ladder, etc.
LinkedIn is not a fun problem.
The UI, the design, the dark patterns - all of it sucks.
It's a job. Nobody particularly wants to be there. There's nothing sacred about the product. Engineers don't worship it.
It isn't a place you'd take a pay cut for the opportunity to work there.
Hence the bloat.
flykespice 24 hours ago [-]
""just""
tape_measure 20 hours ago [-]
Seems that both of these articles are written by LLMs.
layer8 19 hours ago [-]
You have to spin it positively: LinkedIn is 350.000 x Voyager.
winnie_ua 19 hours ago [-]
To be fair. this HN thread useees 40-70 MB of ram in Chrome.
Reminded me of the anecdote mentioned in the classic "Real Programmer Don't Use Pascal"
> Some of the most awesome Real Programmers of all work at the Jet Propulsion Laboratory in California. Many of them know the entire operating system of the Pioneer and Voyager spacecraft by heart. With a combination of large ground-based FORTRAN programs and small spacecraft-based assembly language programs, they are able to do incredible feats of navigation and improvisation -- hitting ten-kilometer wide windows at Saturn after six years in space, repairing or bypassing damaged sensor platforms, radios, and batteries. Allegedly, one Real Programmer managed to tuck a pattern-matching program into a few hundred bytes of unused memory in a Voyager spacecraft that searched for, located, and photographed a new moon of Jupiter.
> The current plan for the Galileo spacecraft is to use a gravity assist trajectory past Mars on the way to Jupiter. This trajectory passes within 80 +/-3 kilometers of the surface of Mars. Nobody is going to trust a PASCAL program (or a PASCAL programmer) for navigation to these tolerances.
The article is satirical so I am not sure how true is this, but over its history, the maintainers of these probes have done truly remarkable stuff like this.
> "Many of them know the entire operating system of the Pioneer and Voyager spacecraft by heart"
is that actually true? During the voyager memory problems of 2023, I seem to recall that there were significant issues uploading entirely new programs to it because there was so little documentation around the internal workings of the hardware and software, and creating a virtual machine to actually test on was a significant achievement
bradley13 5 hours ago [-]
Amazing engineering. Today's software development: Write a program running on a framework (of which you need 1%, but get it all), that framework depends on dozens of libraries (but again, you only needed 1% of them), which in turn depends on dozens more.
Result: Your starter program takes 1GB of memory and needs 6 cores to display "Hello, World!"
We waste resources, because Moore's Law gave us resources to waste.
ramon156 7 hours ago [-]
> The phone in your pocket has roughly one million times more memory than the computer running Voyager 1.
I know both things are almost entirely unrelated, but I sometimes wonder how much more perf you could squeeze out of a phone if Android wasn't doing so much stuff in the background. Granted I do not know enough about the inner workings.
grishka 7 hours ago [-]
Android does a lot less stuff in the background than it used to.
Initially there were no limitations at all, your app could just do whatever, you ask to start a service, the system runs it for you no questions asked, only kills it if a foreground app needs memory, and then restarts it whenever possible.
Modern Android is very strict about this sort of thing in comparison. You only run something in the background if you have a good reason to, and you better display a notification while it's running. Background processes that try to do stuff in the background without telling the system are killed and throttled aggressively.
1718627440 2 hours ago [-]
I think he was referring to things the OS does, rather than apps running in the background. My computer is under nearly full load when I start MS Windows and let it be "idle". (I run 10 IoT Enterprise so there is less bloat than typically, I also already tried to disable stuff I could find.) When I start my GNU/Linux OS it is truly idle and I can do video processing or compile stuff with hundreds of translation units in parallel.
There’s a lot of LLM text in that article. It’s very offputting.
armadsen 21 hours ago [-]
Yeah, it’s really starting to depress me how much text published to the web is written using an LLM now. Things that seem interesting at first glance become much less appealing when they have that telltale LLM quality to them, and I also start questioning whether they’re full of factual errors (“hallucinations”). I don’t know why I should spend my time reading something the author couldn’t even be bothered to spend time writing.
sbinnee 18 hours ago [-]
Indeed. I also had this weird feeling while reading through the article. It got hooked up in the beginning. And then at some point, my brain just noticed that it was LLM-generated. I wonder how this article was written. Did the author accidentally find about Voyager 1's tiny memory and its primitive tape technology while reading something else, or did he just ask LLMs to write something interesting that he could publish with a few prompts.
stared 1 days ago [-]
Good they launched Voyager 1 before invention of Docker, Electron and NPM projects with thousands of padLefts.
gitaarik 12 hours ago [-]
As long as it doesn't auto-update it should be fine right? Just don't let those Aliens see that source code
jacquesm 7 hours ago [-]
One alien sysop to another: so, you're telling me we got hacked by some other civilization because of a supply chain attack?
tkocmathla 1 days ago [-]
It's very distracting to have every sentence in this article be its own paragraph.
branon 23 hours ago [-]
It's LLM slop unfortunately, bears the hallmarks at least :(
LorenDB 1 days ago [-]
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caxco93 4 hours ago [-]
sadly had to stop reading at
```
The tape recorder did not fail.
The power supply simply could no longer spare the energy to run it.
That distinction matters.
```
TyrunDemeg101 2 hours ago [-]
Same, holy shit immediately knew this was written by an LLM.
gdubs 22 hours ago [-]
One of my favorite stories about the Voyager mission was how they wanted to grab photos of the outer planets but the click of the tape drive was enough to ruin the long exposures. I made a YouTube short about it a while back:
I enjoyed your video and it is well done. Unfortunately, I don't think it's true. The Voyager tape drives were similar (if not largely identical) to the earlier Viking Orbiters' DTRs. The Voyager engineers were certainly familiar pre-launch with the motions imparted to the spacecraft by the mechanical movements of the tape drive. The Voyager DTRs were specifically mounted to minimize the effects on the roll axis.
Potential problem were expected and planned for with Voyager 2's flybys of Uranus and Neptune. Because of the long exposures required for these more distant planets, like you pointed out, the engineers had to account for the attitude effects of both (i) the DTR movements and (ii) panning the cameras to keep them focused on a single point while the spacecraft was moving past at high speed. This was especially a problem at Uranus, which is tilted on its side. Voyager 2 was approaching at its north pole; with the plane of the moon's orbits perpendicular to the ecliptic - like an arrow flying into an archery target. As a result of this configuration and Voyager 2's high speed, the high-resolution observations of Uranus and its moons were compressed into a 6-hour period.
These engineering efforts are described in detail in a 1985 paper, "Voyager Flight Engineering: Preparing for Uranus", by W.I. McLaughlin and D.M. Wolff. Abstract: https://arc.aiaa.org/doi/abs/10.2514/6.1985-287 (The full paper can be found online with some effort; doi:10.2514/6.1985-287) Here's a quote from the paper (AACS is the attitude control computer and CCS is the command computer):
"The DTR is mounted on the spacecraft such that its angular momentum is introduced into the yaw and pitch axes of the spacecraft with almost none going into the roll axis. DSSCAN was first programmed to introduce cancelling momentum in the yaw axis only. The modification to the AACS and CCS software took place in an environment of a scarcity of available memory so that, from a programming point of view, it had to be carefully fit in. The "patch" was carefully tested in the Voyager Capability Demonstration Laboratory (CDL) before loading onboard Voyager 1. (The AACS and CCS programs were modified without being reassembled as is the case with all AACS and CCS changes since launch.) The CDL is a digital/analog simulation of many of the spacecraft capabilities. Modifications or tests of any degree of complexity are done first, whenever possible, on Voyager 1 before implementation on Voyager 2, a reflection of the fact that Voyager 2 still has two planetary encounters scheduled while Voyager 1 has none."
gdubs 19 hours ago [-]
Thanks! My primary source for this was Carl Sagan's book "A Pale Blue Dot" IIRC — don't have the folder in front of me to double check, but fairly certain.
Edit: found it!
Here's the excerpt. According to Sagan they sent these instructions up. Given his details on what had to be done to boost the signal upload, it sounds like this really did happen:
"...while taking a photograph of a street scene from a moving car.
This may sound easy, but it's not: You have to neutralize the most innocent of motions. At zero gravity, the mere start and stop of the on-board tape recorder can jiggle the spacecraft enough to smear the picture.
This problem was solved by sending up commands to the spacecraft's little rocket engines (called thrusters), machines of exquisite sensitivity. With a little puff of gas at the start and stop of each data-taking sequence, the thrusters compensated for the tape-recorder jiggle by turning the entire spacecraft just a little.
To deal with the low radio power received at Earth, the engineers devised a new and more efficient way to record and transmit the data, and the radio telescopes on Earth were electronically linked together with others to increase their sensitivity. Overall, the imaging system worked, by many criteria, better at Uranus..."
mek6800d2 15 hours ago [-]
Thanks for the excerpt. I read a couple of Sagan's other books many years ago and I really should read APBD sometime.
Interesting to me, Sagan's "little puff of gas" was borne out in the paper I referenced (not that Sagan needed being borne out!) and that the resulting "imaging system worked ... better at Uranus" was something I hadn't thought of. Per the paper, the Voyagers originally had minimum thruster pulse lengths of 10 ms. In the lab and then on Voyager 1, the Voyager engineers figured out that they could reduce the pulses to 5 ms, thus allowing finer control of Voyager 2's attitude at Uranus (and later Neptune) and probably better image quality than at Jupiter and Saturn. Very interesting - I really should read Sagan's book!
gdubs 1 hours ago [-]
I really enjoyed it! Actually read it to my kids as a bedtime book, and although it was pretty advanced for them, they really stayed with it. Really too bad he's not around anymore.
vmilner 9 hours ago [-]
The estimable (inestimable?) Daniel Estevez wrote excellent blogs on the Voyager comms protocols.
Wow! Reading this after watching PHM I almost cried...again.
Now, this is what impressed me the most: ""... and wrote software flexible enough to be updated from Earth decades after launch.."
OTA patches where invented in the 70's :)
Quitschquat 23 hours ago [-]
What's PHM
ethmarks 23 hours ago [-]
Project Hail Mary. It's a sci-fi novel by Andy Weir (author of The Martian) that was adapted into a movie that released in theaters a couple weeks ago. It's fantastic and you should totally read/watch it.
hakunin 1 days ago [-]
I’ve been looking at emulation for the first time in a long time, and it also blows my mind that entire big detailed games that we played for many hours take 100-400kb total (NES) or 2-4mb (Genesis).
masfuerte 1 days ago [-]
My first computer had 32KB. Reading the headline there's still a part of my brain that went "69KB? Luxury!".
zimpenfish 23 hours ago [-]
> My first computer had 32KB.
1KB for me[0]. Then another 1KB[1] expanded to 16KB via my father's electronic wizardry. Then an official 16KB[2] and ever upwards from there.
Still amazed how much fun it is to play a 36KB Stargate Defender!
lnsru 24 hours ago [-]
Welcome to the world of embedded systems. They often do not have more resources that that. Even as completely new development (of pool control system or electricity meter).
praveen9920 8 hours ago [-]
I wonder if we can build a series of probes sent one after the other, which can communicate with relay network. Im sure we can reduce the power requirements for radio for each probe.
I have a feeling this feat is all about the budget requirements rather than technical feasibility.
Waterluvian 24 hours ago [-]
Nice. I’ve done some of my best learning by trying to do things with very artificially low resource constraints. The struggle I have at times is to properly calibrate my brain to the right resource scope. Ie. “No, stop optimizing these enums as integers instead of strings… this isn’t the game boy emulator this is a web browser. It’s fine.”
nxobject 15 hours ago [-]
Man, I'd love to play around with an emulator for that.
vmilner 9 hours ago [-]
Edwin Berlekamp significantly reduced (by half I think) the number of transistors required for the Reed-Solomon error correcting code by telling them to use a non-standard 'primitive element'
ftkftk 22 hours ago [-]
Voyager is an awesome mission. But the AI fingerprint in the piece is a turn off.
phreeza 23 hours ago [-]
What really gets me is that the time between windows 95 and now is more than between voyager launching and Windows 95. Same for the moon landings for that matter.
Egonex 9 hours ago [-]
Totally get it. We work on compact binary alerts for constrained links. We have the same obsession with bytes.
We are so detached from the software "engineering" in our jobs that we are amazed when we see it.
abhishekayu 12 hours ago [-]
Voyager is proof that when requirements are stable and systems are simple, longevity follows. We rarely get that luxury today.
bombcar 22 hours ago [-]
Given the LLM on a PDP-11 which had 32KB of RAM, we should be able to install an LLM on this thing.
scottlawson 21 hours ago [-]
the legacy of Voyager 1 is crazy, this spacecraft launched decades before I was born and yet I see it regularly talked about even today. Seeing posts about how the Voyager 1 was leaving the solar system led to me learning about the heliosphere. Hearing about the Pioneer anomaly https://en.wikipedia.org/wiki/Pioneer_anomaly led me down a rabbit hole of learning about thermal radiation and radiation pressure (granted this is not Voyager). Then I learn about how it is powered by radioisotopes, its kind of cool how many things I've learned from these "ancient" spacecraft.
mkrd 20 hours ago [-]
A phone only has roughly 1 million times the memory, as I am roughly 20 meters tall
hellzbellz123 5 hours ago [-]
its the 'ol honda' of spacecraft. definitely one of my favorite human achievements
pickleglitch 4 hours ago [-]
Could it run Doom tho?
thomasgeelens 22 hours ago [-]
I know it makes no sense about what I'm going to say but: whenever I lose a 'simple 5G phone call' connection I remind myself that the Voyager 1 runs on 69kb of memory and there's a robot on Mars.
aag 21 hours ago [-]
This makes me nostalgic for my 4K TRS-80 Model I with cassette tape. There was something beautiful about having control over everything, and even the tight constraints were sometimes fun.
ginkgotree 17 hours ago [-]
Compared to LinkedIn, which consumes GBs of memory.
trgn 23 hours ago [-]
Wish javascript devs would read this. If the web is slow, its because of them
2 hours ago [-]
netcoyote 15 hours ago [-]
Kudos to those NASA engineers for managing to pack React into such a small footprint.
djb-at-durable 22 hours ago [-]
I feel like that's also what's running the backend of Spirit Airlines, but somehow it feels more impressive in the context of Voyager 1.
jiveturkey 2 hours ago [-]
surely, the security protocols and radio modulation techniques of the day did not consider a modern-day internet threat landscape. i'm a bit surprised no one has sent their own command signals to Voyager. i'm guessing massive transmit power must be required.
tom-blk 24 hours ago [-]
Very cool, first time reading about the specifics of voyager 1, this is super impressive!
setnone 12 hours ago [-]
i wonder was there a hot debate on whether or not to include Golden record
JKCalhoun 19 hours ago [-]
Voyager 1 and 2 communicate by CB radio.
<jk>
jmclnx 1 days ago [-]
I knew about the memory, but an 8-track tape ? That is a surprise. But when you think of it, what else could you use for this in 1977.
What amazes me is the tape lasted almost 30 years. I knew tapes back then could last a while, 30 years being bombarded with cosmic rays ? inconceivable :)
duskwuff 22 hours ago [-]
A tape with eight tracks, yes. But not the audio cartridge format commonly known as "8-track"; that wouldn't have been suitable to the task. Here's a photo:
An old 1970's arcade game, Quiz Show, used an 8-track tape to store the questions and answers. There's a YouTube video about it, and audio dumps of the 8-track on archive.org I think.
reaperducer 23 hours ago [-]
What amazes me is the tape lasted almost 30 years
Yesterday I loaded a program on tape bought at Radio Shack in 1985 into my TRS-80.
That's 41 years ago.
I suspect the key is using commercial-grade recorders and thick tape.
PepperdineG 22 hours ago [-]
I suspect the key was you used Dr Emmett Brown to tune up the equipment then plugged your electric guitar into his amplifier.
dev_l1x_be 22 hours ago [-]
How could they achieve this with much abstraction?
geor9e 16 hours ago [-]
"That moment was not just a milestone in mission terms. It was a fundamental scientific event."
Come on people. This article is straight out of ChatGPT.
I'm just going to repost stuff from my blog about the Voyager space probes. I've posted this here before -
The two Voyager spacecraft are the greatest love letters humanity has ever sent into the void.
Voyager 2 actually launched first, on August 20, 1977, followed by Voyager 1 on September 5, 1977. Because Voyager 1 was on a faster, shorter trajectory (it used a rare alignment to slingshot past both Jupiter and Saturn quicker), it overtook its twin and became the farther, faster probe. As of 2025, Voyager 1 is the most distant human-made object ever, more than 24 billion kilometers away, still whispering data home at 160 bits per second.
Each spacecraft carries an identical 12-inch gold-plated copper phonograph record.
The contents:
- Greetings in 55 human languages.
- A message from UN Secretary-General at the time and one from U.S. President Jimmy Carter.
- 115 analog images encoded in the record’s grooves: how to build the stylus and play the record, the solar system’s location using 14 pulsars as galactic GPS, diagrams of human DNA, photos of a supermarket, a sunset, a fetus, people eating, licking ice cream, and dancing
The record is encased in an aluminum jacket with instructions etched on the cover: a map of the pulsars, the hydrogen atom diagram so aliens can decode the time units, and a tiny sample of uranium-238 so they can carbon-date how old the record is when they find it.
Sagan wanted the record to be a message in a bottle for a billion years. The spacecraft themselves are expected to outlive Earth. In a billion years, when the Sun swells into a red giant and maybe swallows Earth, the Voyagers will still be cruising the Milky Way, silent gold disks carrying blind, naked humans waving hello to a universe that may never wave back.
And it was Sagan who, in 1989, when Voyager 1 was already beyond Neptune and its cameras were scheduled to be turned off forever to save power, begged NASA for one last maneuver. On Valentine’s Day 1990, the spacecraft turned around, took 60 final images, and captured Earth as a single pale blue pixel floating in a scattered beam of sunlight — the photograph that gives the book its name and its soul.
It was the photograph that inspired this famous quote -
"Look again at that dot. That's here. That's home. That's us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives. The aggregate of our joy and suffering, thousands of confident religions, ideologies, and economic doctrines, every hunter and forager, every hero and coward, every creator and destroyer of civilization, every king and peasant, every young couple in love, every mother and father, hopeful child, inventor and explorer, every teacher of morals, every corrupt politician, every "superstar," every "supreme leader," every saint and sinner in the history of our species lived there-on a mote of dust suspended in a sunbeam.
The Earth is a very small stage in a vast cosmic arena. Think of the endless cruelties visited by the inhabitants of one corner of this pixel on the scarcely distinguishable inhabitants of some other corner, how frequent their misunderstandings, how eager they are to kill one another, how fervent their hatreds. Think of the rivers of blood spilled by all those generals and emperors so that, in glory and triumph, they could become the momentary masters of a fraction of a dot.
Our posturings, our imagined self-importance, the delusion that we have some privileged position in the Universe, are challenged by this point of pale light. Our planet is a lonely speck in the great enveloping cosmic dark. In our obscurity, in all this vastness, there is no hint that help will come from elsewhere to save us from ourselves.
The Earth is the only world known so far to harbor life. There is nowhere else, at least in the near future, to which our species could migrate. Visit, yes. Settle, not yet. Like it or not, for the moment the Earth is where we make our stand.
It has been said that astronomy is a humbling and character-building experience. There is perhaps no better demonstration of the folly of human conceits than this distant image of our tiny world. To me, it underscores our responsibility to deal more kindly with one another, and to preserve and cherish the pale blue dot, the only home we've ever known. "
That picture almost didn’t happen. NASA said it was pointless, the cameras were old, the images would be useless. Sagan argued it would be the first time any human ever saw our world from outside the solar system. He won. The cameras were powered up one last time, the portrait was taken, and then they were shut down forever.
We need a new round of voyager probes with modern technology. We should be at least trying to reach another solar system.
sergiotapia 21 hours ago [-]
What happens when hydrazine tanks run out and it can't stabilize anymore to shoot data back to earth? it's over?
PearlRiver 22 hours ago [-]
I watched a documentary about Voyager once. It was fascinating seeing all these men and women huddled around a tiny little screen and a telex printer to see all their theories about Saturn become real.
It was the Neil Armstrong moment for astronomy.
elvis70 23 hours ago [-]
> For the first time in the history of the universe, as far as we know, an object built by a living species had left the protective bubble of its home star system...
Seriously?
wongarsu 22 hours ago [-]
An easy claim to make if you only check with species from one star system
krapp 22 hours ago [-]
Which other species in what other star systems do you suggest we check with?
palmotea 1 days ago [-]
Decommission. It's not AI ready.
hedgehog 1 days ago [-]
If we wait long enough someone out there will upgrade it and send it back to us.
bravoetch 1 days ago [-]
For those unaware (spoiler follows) this is the reveal in the plot of 'Star Trek - The Motion Picture'.
temp0826 1 days ago [-]
I implore you to read 17776
thebeardredis 21 hours ago [-]
More resources than AOC has.
vpribish 16 hours ago [-]
nice
shevy-java 8 hours ago [-]
Back then they were efficient.
Today we have the slops instead - microslop, autoslop, all-the-slop.
robthebrew 1 days ago [-]
but can it play Doom?
ill_ion 21 hours ago [-]
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uwagar 1 days ago [-]
so unbelievable that makes you wonder if its all fake.
hybrid_study 1 days ago [-]
Oh c’mon! Do you really believe we actually sent space probes ~15.0 billion miles from earth?
Next you’ll tell me that the message from humanity was read by someone later linked to Nazi-era activities (though not a confirmed war criminal in the legal sense).
amelius 1 days ago [-]
And what did we get from this space innovation?
Not the cheap prosumer high density backup tape drives that we should be able to buy in the stores now.
[1] https://en.wikipedia.org/wiki/Gravity_assist [2] https://en.wikipedia.org/wiki/Voyager_1#/media/File:Voyager_...
From another comment Jupiter and Saturn align every 20 years, so we have 5 rehearsal windows before the big one. What fancy projects can we do in them to get funding? Is it too late for the first one? Can we ask Elon to pay for the first two?
https://en.wikipedia.org/wiki/A_Canticle_for_Leibowitz | https://openlibrary.org/works/OL2626638W/A_Canticle_for_Leib...
https://en.wikipedia.org/wiki/Grand_Tour_program
https://en.wikipedia.org/wiki/Ingenuity_(helicopter)
It was sent to Mars with a plan for 5 flights and a total of 7 or 8 minutes flight time. It ended up flying for over 2 hours in 72 seperate flights before it damaged itself with a bad landing. Not quite the "this thing is still doing science almost 50 years later" that Voyager can claim, but impressively engineered so it lasted way beyond it's initial mission plan.
https://youtu.be/otwkXZ0SmTs?si=DqEyklYpEbUO69HL
But only one country landed a man on the moon.
What is progress exactly?
Stop being a capitalist hellhole, and maybe try being a country that happens to operate under bounded capitalism, and just maybe, maybe, you can see some of that progress.
But what am I saying, cmon, that'll never happen.
There has to be profit first to be able to fund big things like Apollo. Profit is good.
Fuck all of it is useful besides satellites. Even the HST is only marginally useful; useful for fields of research which will almost certainly never have tangible benefits for life on Earth, built to satisfy our curiosity about phenomena too large and far from Earth to ever be put into use here on Earth.
Nonetheless, interesting? You're bonkers if a system like the Apollo program and all associated hardware isn't at least interesting.
just be happy there's no cats in space to take pictures of otherwise all would be lost.
Or is this an unserious argument you can use to nitpick anything? Why is my local government building another playground when they could be feeding African orphans??
I would argue that a healthy population is what allows great things like Apollo to happen. For such a program to succeed, we need lots of highly skilled people. Scientists, engineers, astronauts, tradesmen, managers, etc... Everyone needs to be at the top of their game. Such talent doesn't develop when you are struggling for your life, you need good conditions like health, confort and stability to be able to focus on your craft.
If we use life expectancy as a proxy, we could say that the US had a healthier population during the cold war than the USSR, and they are the ones who succeeded on the most ambitious project in the space race, despite the USSR having a head start. To me, it is not a coincidence.
Also, the cold war era was not just about space, it is also a time of major advance when it comes to medicine, life expectancy has seen a dramatic improvement, so we can put men on the moon and keep a population heathy.
Why is is that science and technology exploration ventures are held to a much higher scrutiny?
Picking from top GDP per capita, I'm not sure that UAE or Qatar are countries to look up to.
They had pretty good results post WW2. The problem is that they ended up lagging behind the western bloc because of a lack of resources and innovation. Basic healthcare doesn't mean much if you don't have good treatment in the first place. It is a common problem with communist countries, they usually have good access to healthcare, but they don't have the resources to give proper treatment.
Could you elaborate on this?
A 20 year intercept would be pretty reasonable though. It needs about 15 km/s delta v after that NH style escape, about a kilowatt of power, and maybe a 25% fuel mass fraction at 6000 Isp. That's all very reasonable by current standards.
Even if we built a rocket just designed to get stuff as far away as quickly away as possible, it would take decades to catch up to where they are now.
New Horizons achieved 80% of Voyager's velocity with just Jupiter, and it wasn't really trying to optimize for speed, it approached Jupiter only to 10 million km (over 100x greater than the planet's radius.) A probe dedicated to a fast slingshot past Jupiter could easily overtake Voyager. We haven't had any need to try, unless one of the missions to specifically study the heliopause-interstellar area happens. It would still take a while to catch up to Voyager's head start, but it's doable.
The alignment for Voyager was captivating, but it really wasn't as important as people typically think. Jupiter alone can get you anywhere and launch windows for it come every 12 years. If the four-planet alignment hadn't happened then, realistically we would have just done separate Jupiter-Uranus and Jupiter-Neptune missions.
I despise the naive scientists who did them as much as those who brought the damocletian sword of nuclear weapons on us.
We are already using spectroscopy to gain insights into the chemical composition of exo-planets, and we have barely begun doing this kind of research. In even just a few decades we'll be massively better at this.
We have literally no idea what technology the alien could have.
There are no material goods that can justify the material and energetic expense of any interstellar travel. You'd be far better off just using a particle accelerator to forge any chemical element and then assemble them into molecules using nano-replicators.
The best you can do is to send information, possibly with the help of gravitational lensing.
Sci-fi mode on: given that the potential galactic civilization is going to be information-based, who's to say the Earth is not already under attack? An interstellar fleet of large invasion ships with soldiers is not feasible, but a small drone with an AI that connects to terrestrial networks and steers the civilization towards collapse is possible. I'd start investigating if TikTok algorithm developers got some nudges from a weirdly knowledgeable source.
Wrong. Dark Forest isn't about conquest, it's about preemptive strikes.
The Dark Forest hypothesis assumes that travel between stars is hard - more importantly, that even communications at those distances is hard - specifically, that it takes a long time, which prevents building trust. This, combined with one other assumption: that technological progress makes unpredictable jumps ahead, makes the conclusion fall out straight from basic game theory.
So per the Dark Forest hypothesis, if you spot a primitive agrarian society sending a "hello" to you with smoke signals, you're better off lobbing a nuke at them in response - because otherwise, should you send a friendly "hello back" instead, you may discover that while that message was in flight, they underwent a triple industrial revolution, and shot a magic proton bomb at you.
Why would they do that, you ask? Because from their POV, at any moment you can have a sudden technological breakthrough and start dragging black holes at them or whatever. Point being, it's best for them to get rid of you, while they still can.
(People get too fixated on the forest metaphor XOR the sci-fi parts, but it's really neither; the second book of the trilogy pretty much spelled out the whole rationale like a math textbook, in case anyone missed it after half of first book making analogies to it with ants and history of modern China and such.)
(ETA: what's the justification for "sudden technological jumps" assumption? History. Humanity had ~all the ingredients for the industrial revolution for centuries, and it's not clear why it happened when it did, and not a century or two earlier (or later). Then it happened, but the outcome wasn't "evenly distributed". Then the 20th century saw several large nations jumping all the way from pre-industrial agrarian societies to post-industrial peer superpowers, in a span of merely a few decades. The author writes extensively about living through that transition in the first book.)
Or maybe pre-emptively sterilize everything to make sure your eventual expansion encounters no issues.
Moreover, if your first instinct is to strike while hiding, then your equilibrium state would be a civilization that is the most successful at wiping out everything around it, spread all over the habitable universe. Dark Forest just doesn't work from the game-theoretical perspective.
It's the same as with sailing stories and reality - the interesting parts are everything that isn't the open blue sea.
Dark Star is one film that directly addresses the long voyage insanity of deep space;
* https://en.wikipedia.org/wiki/Dark_Star_(film)
Similarly with sailing films, particularly documentaries, there are films that focus more on the journey than the endpoints. eg: (IIRC) the Kon-Tiki (1950) doco had a lot of mid ocean time.
I'm sure you do understand it. I mean, sure, the other things you mention are also interesting, but mankind has been awed by a starry night's sky since we were able to look up. We gave names to the arrangements of bright things in the skies and imagined gods in them, and navigated by them. The are awe-inspiring.
It's really a human thing, not a scifi nerd's. It's impossible not to look at the stars and wonder. It's human nature.
Judging by social media, half the population has an unhealthy obsession about travel and tourism. It's not hard to connect dreams of space to interests of most people here: most stars you look at have planets around them, now imagine some of those are like Earth, and now suddenly this is a place to on a cruise to, to have new pictures to post to Instagram.
Material, no. but we know with absolute certainty that Earth will stop being habitable for humans at some point. So assuming any intelligent race, human descendent or otherwise, still exists on this planet, it will have to eventually move. It's just pure luck that we evolved when we did. But there are valid reasons for interstellar travel(other than you know, pure curiosity).
Scifi usually bypasses this by breaking the laws of physics, for the sake of storytelling.
Dark Forest isn't about hiding from invasion. It's about hiding from getting preemptively sniped by someone else, worried that one day you may find a reason and a way to snipe them.
For this to work out you don't need interstellar colonization to be plausible - merely the ability to accelerate a rock to a significant fraction of the speed of light is enough, and that's definitely much closer to science than fiction.
Dark Forest also assumes aliens aren't curious and thrilled about other life existing out there. The one civilization we are familiar with wouldn't react like this. And we're talking about a very warlike civilization!
And if you can do that, then why bother with the interstellar travel? Just move to a higher orbit to survive the red giant stage. And then move closer to the stellar remnant, white dwarves will provide plenty of energy for trillions of years.
And if you manage to transcribe yourself into some kind of computing-based device, then why bother at all?
Theres no hiding that fact. If they're within about 100 light years they'll be watching the effects of the Industrial Revolution on the atmosphere. Even if they're don't know the exact cause the spectra of pollutants and rates of change will give hints the changes are unlikely to be from random natural processes.
Outside of 100 light years but pretty much anywhere in the galaxy (assuming interferometers capable of getting spectra of Earth) will know there's some sort of life here. Even if you want to assume some aliens don't recognize life as we understand it they'll at least see extremely interesting and varied chemistry.
The idea you're going to hide Earth's biosignatures is silly. Trying to hide our technology signatures is pointless. At about 70 light years any interested aliens will start seeing isotopes resulting from above ground nuclear testing.
While telescopes indeed are not magic, an alien species at least as advanced as us could have telescopes capable of not only finding Earth but gathering spectra from it. It's certainly no guarantee Earth would be found but there's no hiding from anyone looking. There's no masking the chemistry of life on Earth and likewise no masting techno-signatures in the atmosphere.
[0] https://chview.nova.org/solcom/stars.htm
The number of techniques for detecting exoplanets makes the Dark Forest concept silly. There's no hiding our solar system from alien observation. For dedicated observers (at the right distances) there's no hiding the existence of life, the Industrial Revolution, or above ground nuclear testing.
like in "fast pacing environments" with "flat hierarchies" and "agile mindset"? :-D
> Theory only takes you so far
OK I was probably wrong about that "not hard" though.
They'd switched away from the primary thrusters in 2004 due to this degradation. Now the backups are so degraded that the primary thrusters are better again in comparison.
Thruster clogging will kill Voyagers in about five years if nothing else gets them first. The least degraded thrusters nozzles are down to 2% of their diameter --- 0.035mm of free-flow area remaining.
The Voyagers will probably celebrate their 50th anniversary, but not much beyond that. :-(
Kind of ignominious to be done in not by the inexorable decline of radioactivity but by an everyday materials science error of the sort we make on earth all the time. In the 1970s, we knew how to make hydrazine-compatible rubber. We just didn't use it for the Voyagers.
I'd love to watch this but unfortunately. My country being AU.
If that doesn't work, try using a VPN set to the US as country.
I checked the usual sites on the high seas and it is available for instant download there too :)
You can rent videos from YouTube, wouldn't you just make the video available but charge for it?
According to Brave's dev tools, looks like just shy of about 90kb on this comment page as of the time of this writing.
Obviously some of that is going to be CSS rules, a small amount of JS (I think for the upvotes and the comment-collapse), but I don't think anyone here called HN "bloated". Even that one page wouldn't fit on Voyager.
Almost certainly my fault...sorry!
You're comparing apples to apple trees
I use an iPhone 5 as an iPod. HN is one of the few web sites that still works with iOS 10.
A number of things don't work, or work in unexpected ways, mostly because Apple doesn't allow me to log in to iCloud with such an old phone.
I can't control lights with the Home app. But Airplay works fine. The phone doesn't know what a HomePod is, but it shows up with a regular generic speaker icon, like the AirMac I have hooked up to my stereo.
Sometimes I have a few minutes to kill, and I pick it up to look at HN. The New York Times web site starts to work, but the login page doesn't load at all. WSJ blocks me at a "verifying the device" screen. WaPo half works. eBay works some, but no pictures. Ditto for Wikipedia.
There's a lot of things you take for granted on a new phone that you only realize when you're using an old phone. Like you didn't used to be able to quickly scroll an entire web page it's only a screen at a time in iOS 10. You can't grab the scroll bar on the side and move it, either.
And 99.9999% of people don't realize the genius of the camera island. It makes it so much easier to pick up the phone if one end is elevated a bit. With a completely flat phone, you end up dragging/scraping it along the table in order to grip it, which scuffs the surface. And if the table is really smooth, it's surprisingly difficult to lift the phone straight up.
https://news.ycombinator.com/item?id=18120477
We put a man on the moon mostly with pencils and slide rules.
Today we have massive data centers full of "AI" supercomputers, and we get… TikTok?
LinkedIn is not a fun problem.
The UI, the design, the dark patterns - all of it sucks.
It's a job. Nobody particularly wants to be there. There's nothing sacred about the product. Engineers don't worship it.
It isn't a place you'd take a pay cut for the opportunity to work there.
Hence the bloat.
https://science.nasa.gov/image-detail/voyager-digital-record...
> Some of the most awesome Real Programmers of all work at the Jet Propulsion Laboratory in California. Many of them know the entire operating system of the Pioneer and Voyager spacecraft by heart. With a combination of large ground-based FORTRAN programs and small spacecraft-based assembly language programs, they are able to do incredible feats of navigation and improvisation -- hitting ten-kilometer wide windows at Saturn after six years in space, repairing or bypassing damaged sensor platforms, radios, and batteries. Allegedly, one Real Programmer managed to tuck a pattern-matching program into a few hundred bytes of unused memory in a Voyager spacecraft that searched for, located, and photographed a new moon of Jupiter.
> The current plan for the Galileo spacecraft is to use a gravity assist trajectory past Mars on the way to Jupiter. This trajectory passes within 80 +/-3 kilometers of the surface of Mars. Nobody is going to trust a PASCAL program (or a PASCAL programmer) for navigation to these tolerances.
The article is satirical so I am not sure how true is this, but over its history, the maintainers of these probes have done truly remarkable stuff like this.
https://homepages.inf.ed.ac.uk/rni/papers/realprg.html
https://www.fihl.net/HSPascal/
https://news.ycombinator.com/item?id=30644308
is that actually true? During the voyager memory problems of 2023, I seem to recall that there were significant issues uploading entirely new programs to it because there was so little documentation around the internal workings of the hardware and software, and creating a virtual machine to actually test on was a significant achievement
Result: Your starter program takes 1GB of memory and needs 6 cores to display "Hello, World!"
We waste resources, because Moore's Law gave us resources to waste.
I know both things are almost entirely unrelated, but I sometimes wonder how much more perf you could squeeze out of a phone if Android wasn't doing so much stuff in the background. Granted I do not know enough about the inner workings.
Initially there were no limitations at all, your app could just do whatever, you ask to start a service, the system runs it for you no questions asked, only kills it if a foreground app needs memory, and then restarts it whenever possible.
Modern Android is very strict about this sort of thing in comparison. You only run something in the background if you have a good reason to, and you better display a notification while it's running. Background processes that try to do stuff in the background without telling the system are killed and throttled aggressively.
``` The tape recorder did not fail.
The power supply simply could no longer spare the energy to run it.
That distinction matters. ```
https://youtube.com/shorts/fssIy-wQisA?si=_HM1fgZKGFfaxWhc
Potential problem were expected and planned for with Voyager 2's flybys of Uranus and Neptune. Because of the long exposures required for these more distant planets, like you pointed out, the engineers had to account for the attitude effects of both (i) the DTR movements and (ii) panning the cameras to keep them focused on a single point while the spacecraft was moving past at high speed. This was especially a problem at Uranus, which is tilted on its side. Voyager 2 was approaching at its north pole; with the plane of the moon's orbits perpendicular to the ecliptic - like an arrow flying into an archery target. As a result of this configuration and Voyager 2's high speed, the high-resolution observations of Uranus and its moons were compressed into a 6-hour period.
These engineering efforts are described in detail in a 1985 paper, "Voyager Flight Engineering: Preparing for Uranus", by W.I. McLaughlin and D.M. Wolff. Abstract: https://arc.aiaa.org/doi/abs/10.2514/6.1985-287 (The full paper can be found online with some effort; doi:10.2514/6.1985-287) Here's a quote from the paper (AACS is the attitude control computer and CCS is the command computer):
Edit: found it!
Here's the excerpt. According to Sagan they sent these instructions up. Given his details on what had to be done to boost the signal upload, it sounds like this really did happen:
"...while taking a photograph of a street scene from a moving car. This may sound easy, but it's not: You have to neutralize the most innocent of motions. At zero gravity, the mere start and stop of the on-board tape recorder can jiggle the spacecraft enough to smear the picture.
This problem was solved by sending up commands to the spacecraft's little rocket engines (called thrusters), machines of exquisite sensitivity. With a little puff of gas at the start and stop of each data-taking sequence, the thrusters compensated for the tape-recorder jiggle by turning the entire spacecraft just a little.
To deal with the low radio power received at Earth, the engineers devised a new and more efficient way to record and transmit the data, and the radio telescopes on Earth were electronically linked together with others to increase their sensitivity. Overall, the imaging system worked, by many criteria, better at Uranus..."
Interesting to me, Sagan's "little puff of gas" was borne out in the paper I referenced (not that Sagan needed being borne out!) and that the resulting "imaging system worked ... better at Uranus" was something I hadn't thought of. Per the paper, the Voyagers originally had minimum thruster pulse lengths of 10 ms. In the lab and then on Voyager 1, the Voyager engineers figured out that they could reduce the pulses to 5 ms, thus allowing finer control of Voyager 2's attitude at Uranus (and later Neptune) and probably better image quality than at Jupiter and Saturn. Very interesting - I really should read Sagan's book!
https://destevez.net/2021/09/decoding-voyager-1/
Now, this is what impressed me the most: ""... and wrote software flexible enough to be updated from Earth decades after launch.."
OTA patches where invented in the 70's :)
1KB for me[0]. Then another 1KB[1] expanded to 16KB via my father's electronic wizardry. Then an official 16KB[2] and ever upwards from there.
[0] https://en.wikipedia.org/wiki/ZX80
[1] https://en.wikipedia.org/wiki/ZX81
[2] https://en.wikipedia.org/wiki/ZX_Spectrum
I have a feeling this feat is all about the budget requirements rather than technical feasibility.
<jk>
What amazes me is the tape lasted almost 30 years. I knew tapes back then could last a while, 30 years being bombarded with cosmic rays ? inconceivable :)
https://science.nasa.gov/image-detail/voyager-digital-record...
Yesterday I loaded a program on tape bought at Radio Shack in 1985 into my TRS-80.
That's 41 years ago.
I suspect the key is using commercial-grade recorders and thick tape.
Come on people. This article is straight out of ChatGPT.
https://space.stackexchange.com/questions/2053/how-was-magne...
The two Voyager spacecraft are the greatest love letters humanity has ever sent into the void.
Voyager 2 actually launched first, on August 20, 1977, followed by Voyager 1 on September 5, 1977. Because Voyager 1 was on a faster, shorter trajectory (it used a rare alignment to slingshot past both Jupiter and Saturn quicker), it overtook its twin and became the farther, faster probe. As of 2025, Voyager 1 is the most distant human-made object ever, more than 24 billion kilometers away, still whispering data home at 160 bits per second.
Each spacecraft carries an identical 12-inch gold-plated copper phonograph record.
The contents:
- Greetings in 55 human languages.
- A message from UN Secretary-General at the time and one from U.S. President Jimmy Carter.
- 115 analog images encoded in the record’s grooves: how to build the stylus and play the record, the solar system’s location using 14 pulsars as galactic GPS, diagrams of human DNA, photos of a supermarket, a sunset, a fetus, people eating, licking ice cream, and dancing
The record is encased in an aluminum jacket with instructions etched on the cover: a map of the pulsars, the hydrogen atom diagram so aliens can decode the time units, and a tiny sample of uranium-238 so they can carbon-date how old the record is when they find it.
Sagan wanted the record to be a message in a bottle for a billion years. The spacecraft themselves are expected to outlive Earth. In a billion years, when the Sun swells into a red giant and maybe swallows Earth, the Voyagers will still be cruising the Milky Way, silent gold disks carrying blind, naked humans waving hello to a universe that may never wave back.
And it was Sagan who, in 1989, when Voyager 1 was already beyond Neptune and its cameras were scheduled to be turned off forever to save power, begged NASA for one last maneuver. On Valentine’s Day 1990, the spacecraft turned around, took 60 final images, and captured Earth as a single pale blue pixel floating in a scattered beam of sunlight — the photograph that gives the book its name and its soul.
It was the photograph that inspired this famous quote -
"Look again at that dot. That's here. That's home. That's us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives. The aggregate of our joy and suffering, thousands of confident religions, ideologies, and economic doctrines, every hunter and forager, every hero and coward, every creator and destroyer of civilization, every king and peasant, every young couple in love, every mother and father, hopeful child, inventor and explorer, every teacher of morals, every corrupt politician, every "superstar," every "supreme leader," every saint and sinner in the history of our species lived there-on a mote of dust suspended in a sunbeam.
The Earth is a very small stage in a vast cosmic arena. Think of the endless cruelties visited by the inhabitants of one corner of this pixel on the scarcely distinguishable inhabitants of some other corner, how frequent their misunderstandings, how eager they are to kill one another, how fervent their hatreds. Think of the rivers of blood spilled by all those generals and emperors so that, in glory and triumph, they could become the momentary masters of a fraction of a dot.
Our posturings, our imagined self-importance, the delusion that we have some privileged position in the Universe, are challenged by this point of pale light. Our planet is a lonely speck in the great enveloping cosmic dark. In our obscurity, in all this vastness, there is no hint that help will come from elsewhere to save us from ourselves.
The Earth is the only world known so far to harbor life. There is nowhere else, at least in the near future, to which our species could migrate. Visit, yes. Settle, not yet. Like it or not, for the moment the Earth is where we make our stand.
It has been said that astronomy is a humbling and character-building experience. There is perhaps no better demonstration of the folly of human conceits than this distant image of our tiny world. To me, it underscores our responsibility to deal more kindly with one another, and to preserve and cherish the pale blue dot, the only home we've ever known. "
That picture almost didn’t happen. NASA said it was pointless, the cameras were old, the images would be useless. Sagan argued it would be the first time any human ever saw our world from outside the solar system. He won. The cameras were powered up one last time, the portrait was taken, and then they were shut down forever.
Full piece - https://www.rxjourney.net/30-things-i-know
It was the Neil Armstrong moment for astronomy.
Seriously?
Today we have the slops instead - microslop, autoslop, all-the-slop.
Next you’ll tell me that the message from humanity was read by someone later linked to Nazi-era activities (though not a confirmed war criminal in the legal sense).
Not the cheap prosumer high density backup tape drives that we should be able to buy in the stores now.