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原始链接: https://news.ycombinator.com/item?id=40687660

有趣的是，以相对论速率向遥远的恒星行进会引发有趣的困境。这种现象被称为时间膨胀，意味着目标位置可能已经过去了很长一段时间，而航行航天器的持续时间相对较短。使用现有技术，理论上它可以在一个生命周期内到达广阔宇宙的目的地，尽管在这些地点需要相当长的时间。然而，这个想法带来了特殊的后果，包括时间悖论。时间膨胀是由于光速有限而产生的，当物体接近高速时，会导致空间和时间的收缩。从本质上讲，与静止的观察者相比，运动中的物体的时间似乎流动得更慢，从而导致称为长度收缩和时间膨胀的差异。想象一下，前往附近的星系，如大犬座星系，距离我们大约 25,000 光年。如果使用理论上的 1G 加速航天器，您可能会在不到 20 年的时间内穿越这个距离 - 然而，在此期间已经过去了近 25,000 年。因此，返回地球将涉及处理复杂的悖论和挑战。先进的技术带来了与时间膨胀相关的一些影响，最明显的是在粒子加速器中，时间膨胀显着影响不稳定的新兴粒子，使它们的持续时间明显长于其原始寿命的预测。然而，在宇宙中任意远行仍然是一个悬而未决的问题，有许多因素阻碍了这一目标的实现。其中包括暗能量所设定的限制、时空本身结构的性质以及当前未知的物理定律所施加的基本限制。为了应对这些挑战，科学家们不断探索突破从量子力学到宇宙学等各个领域界限的途径，寻找有关现实终极本质问题的答案。尽管考虑前往数十亿光年之外的恒星旅行可能还为时过早，但正在进行的研究致力于解开宇宙的秘密并扩大我们的集体理解。

Seeing this news is a nice tribute to Ed Stone, who was one of the core project scientists for Voyager and recently passed [1] (and all those who work/worked on the program).

I had the pleasure of meeting Dr. Stone at a public NASA event many years ago. I asked him, perhaps a silly question: "what does it feel like to know you built the furthest man-made known object in the universe?".

He paused for a moment, after which he responded, with a smile: "Pretty darn good".

RIP, Dr. Stone and go Voyager go!

[1] https://www.jpl.nasa.gov/news/ed-stone-former-director-of-jp...

That’s the major problem with generation ships. Unless you have a propulsion lab and scientists on the ship, earth will just keep making faster ships and when you arrive at your destination you may discover it has been inhabited for generations by people who left a hundred years after you did.

The power of procrastination is great.

This gets really interesting, and weird, if we're ever able to start making ships capable of approaching relativistic rates. You could arrive at the destination after 500 years, only to discover that humans colonized it 50,000 years ago.

For those who may not know, the speed of light isn't really a speed limit per se. If you have a button that gives you an acceleration of 1km/s, nothing stops you from hitting it 300,000 times in a row (with the speed of light being ~300,000km/s), or even a billion. Instead the entire universe begins to distort with distances becoming literally physically closer, and with rate of time itself also changing (length contraction + time dilation are the terms).

It has the interesting implication that if we could ever create a ship that "just" accelerates at 1g, you could travel essentially anywhere in the universe, even if it's billions of light years away, in a single human lifespan! [1] So for instance the distance to the closest galaxy, Canis Major, is about 25,000 light years. You could get there in our 1g ship in less than 20 years. Of course, 25,000 years would genuinely have passed in the interim, so you get all sorts of fun paradoxes and oddities. And the oddities are exponential, so you could travel a billion light years in 40 years.

And this isn't just hypothetical or whatever. Time dilation plays a major role in many things, like particle accelerators. Unstable emergent particles end up 'living' for far longer than they should thanks to the fact they're moving at near light speed relative to us, which means that time is [relatively] passing for it more slowly than for us.

[1] - http://convertalot.com/relativistic_star_ship_calculator.htm...

You are wrong in the sense time dilation happen in different observer … it is nothing to do with one object. Your time remained as your length to you.

Light speed is the limit. You cannot exceed it and you reach it time stop to you … but still you move on in the speed of light.

Another issue you have thought of is the real space “dilution” or that bloody constant Einstein mistake originally. The so called dark energy describe it. We are not sure as it depends upon the model. But it is very unlikely you can reach everywhere you like unless the universe loop around itself (so like on a Sphere you can cover the whole surface of the sphere if you travel with unlimited time … except it expand as we think it is and you cannot).

One possibility though is the universe contract. Then no need to travel la. The whole universe collapse on you.

What happen when we reach the point our laws of physics as we know it no longer held … no human knows. May be …

Let there be light. As God in bible does not make this world out of nothing it seems. Or if you not God person then the empty vacuum field has possible enough to produce the universe (and destroyed it in 10^-32 second.

Anyway all amazing stuff. Just as a hacker really really want an emulator and look around this human artifice that is our gift to the universe. (Just hope the tv serial of hitter in Germany olpymic does not hurt our images).

I mentioned this point on a HN post a few months ago and someone said that the Voyager was launched at a very beneficial time, leveraging some gravitational pull of some celestial body, so it’s unlikely we can just make a faster ship and catch up/surpass it.

If I thought 17 km/s was even half of the fastest we would ever go, I’d have to give up a lot of dreams for the future. Since I’m not prepared to do so I will stick out my proverbial tongue at this assertion.

That’s just a standard chemical rocket for the initial push and then a few gravity assists right?

Couldn’t an ion engine with a nuclear reactor providing the electricity accelerate more over that period? I’m genuinely curious, I don’t know the answer.

Even an ion engine needs fuel. We shot out Voyager 1 in 1977. It has traversed 47 years of distance.

There has been the talk of solar sails as well, but gravity assist propulsion is already so much easier to achieve for satellites.

The "Grand Tour" alignment that Voyagers were initially intended to take advantage of only happens once every 175 years (although if the goal is just max speed I don't know if favorable conditions happen more often than that)

Obviously, no need to answer further, I'm just being grumpy I imagine.

Man - why go there? What are we looking to learn?

Do they have the kilometer Gw phased array yet?

The meterwide/gram weight sails?

The chips that weight one gram with comms and cameras and all that?

And just to clarify, they can't flip and slow down, so it's a 0.15c flyby of alphacentauri, entirely automated. So hopefully the code does't fuck up in this alien environnement without human help.

What do they expect to learn at that speed and with such small sensors? Like a picture of the planet, like we get telescopes? I sure wonder the speed at which that's going to transmit data.

I'm just seeing "proof or concept" but this is mostly concept and no proof.

And if this is "step one" of interstellar travel, what's step two?

Edit0: Just reading the wiki this is so absurd -atmospheric turbulence is a challenge to deliver te GW laserb- so were planning on building a km phased array in space to accelerate the swarm. Just this itself is way way beyond realistic. Doesn't this breakdown at napkin math levels?

> Man - why go there? What are we looking to learn?

The how is a much bigger problem than the why. It would be great to have some closer sampling of Proxima b, such as images, spectroscopy, etc. You won't get much on a 0.15c flyby, but you'd get something, hopefully. No room for error of course, with a several year round trip for commands.

Having some sense of the planet could inform a colonization plan that's likely to have even bigger problems with the hows rather than the whys.

But the whys are clear. Even if it's not actually feasible.

> Doesn't this breakdown at napkin math levels?

Only in terms of cost; there's nothing that seems to be fundamentally unobtanium here. The question is whether it can be come cheap enough to be viable.

> there's nothing that seems to be fundamentally unobtanium here

Don't you think this is begging the question? The entire history of humanity is a lengthy series of discoveries that people of times past would have little reason to think possible, and in some cases are revolutionary enough that it would likely have been all but impossible for people of times past to even think of them.

Then there's just the boring things, like aspirin. If not for the willow tree, it would not exist today. Ancient medicine dating back 2400+ years recommended chewing on willow bark to treat fever or pain, and indeed they were right. Of course we can now easily synthesize it, but that's not always a given for every compound or 'thing' imaginable, to say the least. For an obvious example, see: uranium.

And now factor in how extremely negligible our knowledge of anything outside of our own planet is. We've been sending probes and rovers to Mars since 1962. We only discovered the soil on Mars was relatively moist (2% water by weight) in 2013! 50+ years to figure out there's water in the soil. And the latest drills can only go a couple of inches deep and are scarcely used in any case, because they tend to break. It's impossible to know what you don't know, but I see every reason to think that it's probably quite extensive.

[1] - https://www.space.com/22949-mars-water-discovery-curiosity-r...

?? I think you've misread my post.

I'm saying that the fundamental things required in order to launch gram-scale interstellar probes don't seem out of reach; that largely something close to the requirements could be made at great cost today, and making a mission practical is mostly about cost optimization and economies of scale.

I think largely whether we do it in 50 years comes down to whether we've wiped out a lot of our economic output by then with strife, and whether we still consider exploration worthwhile to spend a lot of money and reources on.

Voyager 1 was launched in 1977 and its code hasn’t broken.

Construct a stack of starships in orbit and you would be able to get a probe there. It’s never about the technology, it’s about whether someone cares enough to spend the resources.

What do you mean about the starship stack? That's the array?

For Voyager, I'll argue that it's mission is much simpler (doesn't need to aim forthe position of something 30 years in the future) and that we keep transmitting to it (the sheer distance will limit our involvement as the delays between transmissions grows). It's also not going at 0.15c, where it needs to do the calcs very quickly.

I'm not sure how easy it would be to make a km wide Gw array on Earth, but building and powering it in space seems much, much harder. Just harvesting the GW takes 3 million solar panels. Just getting that to orbit seems unlikely. Even with very generous 1kg per panel we get 3 million kg to put in orbit, or 21 Falcon Heavy at max payload, or two years of putting nothing but solar panels up. It's so much.

And then how much money is going to make the gram scale probe appear?

Edit0: to clarify, the probe will have less time than the duration of the blink of an eye to take measurements. That's limiting what you can learn AND makes it very hard to aim correctly.

When you have the means to harvest and beam out a GW in space, it is not like the only use for it would be sending those probes. Seems like damn useful infrastructure for almost anything else. So, we can expect the hurdles to be overcome for other purposes as well...

Betting against humans making breakthroughs is usually a bad bet. As the saying goes: "You can say 'it can't be done' all you want, but please stay out of the way of those who are doing it."!

Voyager 1 has had an almost 50 year head start, and it was launched with a series of gravitational assists that are only possible every few hundred years. There is 0 chance anything will catch up to it in the next 50 years, and probably for several hundred more years after that, if ever.

That’s a really pessimistic take. Voyager 1 moves at ~17 km/s (and slowing down but it doesn’t really matter). That’s on the order of 0.0001 c and indeed just a half of Earth’s orbital speed, so a part of the year the probe is actually getting closer in Earth’s frame.

A one-kg nanoprobe attaining 0.001 c would be perfectly feasible with today’s tech and would overtake Voyager 1 within a decade. Breakthrough Starshot proposes laser sail acceleration of gram-scale probes to > 0.1 c, a thousand times faster than V1, and nothing in the design requires fundamentally new tech. Such probes would claim the distance record in a few weeks of travel, no matter whether they’re launched twenty or fifty or a hundred years from now.

I don't see a date announced for launch, and I see a lot of technology that needs to be invented for this to be feasible. How likely is it to happen within the next 10 years?

I'm just thinking about my old roommate, a space science postdoc, who told me about all these cool propulsion projects that sounded very feasible. That was—sheesh—20 years ago, and I keep waiting for any of them to be real.

It's just a question of funding. There's nothing that's needed to accelerate small enough probe on an escape trajectory at a few hundred km/s except plain old chemical rockets with enough stages. If we can accelerate a >500 kg probe to 20 km/s, we can certainly use an extra stage with 400 kg of propellant to boost a 1 kg probe to much higher velocities.

And nobody talked about the next ten years. The GP said "fifty years", which is way too long a time span to have any certainty whatsoever as to what will happen. GP's assertion was 100% ludicrously overconfident.

If you have enough of them, you get data from Alpha Centauri within a human (natural) lifetime. Plus the bragging rights, I guess, Starshot is after all a private endeavour.

Modern silicon design with mems sensors I suspect could do an awful lot with a gram.

Also, at this scale, not much can be done by hand, so you can make hundreds of them for not much more cost than doing one.

And how do you get the data back from these probes? The voyagers have antennas that are close to 4 meters in diameter and ~25-watt radio transmitters. You aren't doing that in a gram, and you aren't powering that in a gram either.

Just go read the starshot proposal. They address all of these issues, some more convincingly than others but they have thought it out in great detail.

In short, it’s a swarm of gram-scale probes and they work together to transmit.

People do things for shits and giggles all the time. SpaceX literally launched a model Tesla for absolutely no reason other than advertising both themselves and their sister company.

Doubly so if they can now become “the furthest man made object”. That’s massive free marketing.

It may also be exponentially easier to do so in the future, lowering the expenditure needed to make it happen.

It might not be reasonable right now, but, once again, the bar was set at always. That is an exceptionally high bar with very little reasoning behind it.

They absolutely had way more of a reason than no reason. Za reason for the Tesla launch was that it was the first falcon 9 heavy launch, and no company was willing to gamble that large of a payload on a untested rocket. So they made the best of it with a PR stunt.

>scientific return

that comes after 'someone out there' misinterprets our super fast gram probes as weaponry and conquers our world for the sake of their own spacecraft safety.

it's ingenious really, let's antagonize a greater power into wormhole-bridge hopping over here so we can reverse engineer their tech.

/s , hopefully.

1 gram at an appreciable amount of c is about as much energy as a nuke. Getting hit by a swarm of these while on a Sunday drive would fuck you up, no matter how powerful you are.

The real reason there isn’t a moon colony? Person gets fired and loses their shit, starts tossing 1-2 km sized rocks down the gravity well and … we all die.

Throwing shit in space is a sure fire way to piss off any species.

Same with a nuke or an engineered pathogen. Throwing rocks from the Moon is less practical though, people would see you setting up the universe's biggest launch pad or railgun for years. It would be the least stealthy, most telegraphed apocalypse possible.

> There is 0 chance anything will catch up to it in the next 50 years, and probably for several hundred more years after that, if ever.

That is a bit pessimistic. There is this paper [1] by JPL and Nasa folks discussing the possibilites of sun-diving solar small satelites. They think that speeds of around 7 AU/year are possible. Voyager 1 is escaping the solar system at 3.6 AU/year. With those speeds catching up to Voyager 1 withing 50 year would be doable. Realistically since we are not quite ready to launch it just yet it is more likely we would miss that 50 year window but I feel better about our odds in the window beyond 50 but within “several hundred years”.

1: https://arxiv.org/pdf/2303.14917

USB-C only mostly fixes the what side is up problem. I've had devices that degraded to only working with the right side up. Usually from pocket fluff accumulation that can be cleaned out, but still.

If I understand the spec properly, the cable isn’t truly symmetrical internally and relies on switching to determine which pins are used for which function. It all seems needlessly complicated to my reading, and it seems like Apple’s Lightning connector is superior in these respects, although I don’t know if it would be capable of performing at USB C’s USB3/4 speeds and implement all its modes, but we're unlikely to get a new connector standard anytime soon, possibly a few USB generations at least. By then, the use case for USB is likely to be much different also, so different design choices are likely to be made to respond to future market conditions that are difficult for me to predict, but I hypothesize that by then ad hoc wireless power delivery and data transfer will be much more mature.

Another unfortunate blunder resulting from the complicated design is that usb C female to usb A male adapters are unsafe and prohibited by the usb C spec (because they can be used to make unsafe connectors)

You still see those adapters frequently because this stupid decision would hobble usb C adoption (since it would prevent you from making a usb C peripheral with backwards compatibility for usb A using an adapter) so manufacturers have largely ignored that part of the spec

I’m somehow failing to understand the use case you’ve described and I don’t think it’s your fault. I’ve seen devices with female USB C ports, and they’re perfectly backward compatible - you either use a C to C cable or A to C cable depending on what is on the other end.

I sometimes see nonstandard A to A cables, however, possibly for the same reasons you’ve mentioned above, but I think it’s usually a cost-saving measure and perhaps easier to implement type A female connectors rather than mini/micro type B, but I have no experience with designing devices, only operating and repairing them.

What is your experience with devices that are backwards compatible with an adapter like you describe? Do you have an example of one, because I can’t think of any, not that I doubt they exist.

Ah my bad, I guess the problem isn't quite as ubiquitous as I thought.

The use case I mean is the same as the other commenter mentioned, devices with a captive male USB c cable, the notable example for me personally is docking hubs, two of the three brands my work recently procured have got one of the other IT teams in a tizzy, because the procuring team didn't realize that the included c to a adapters were problematic. For one brand the adapter was permanently attached to the cable too, I wonder if as a mitigation for the chance of misuse?

But the general case is devices with an integrated male USB c cable

If you have a usb NIC, chances are it has a male plug so it can connect directly to a computer without an extra cable.

If it has usb A male, it can connect to a large number of computers, but nothing from Apple recently. If it has a usb c male, it can connect to recent Apple computers but has limited ports on other computers and can't connect to older computers.

If it has a usb-c and a usb-a male to usb-c female dongle (often attached to the little bit of cable between the device and the plug), then it will work with everything.

If you clip off the dongle, then you can use it to connect usb c male devices to usb-a female ports in lots of useful applications. It violates the spec, but it's super handy. If you have a usb a male to usb c male cable, you can use the forbidden dongle and the allowed cable to make a forbidden usb a male to usb a male cable which is probably not useful for much.

I appreciate your example of a USB NIC, as I am familiar with both USB A and USB C versions of those. I was specifically envisioning devices with female ports, but out of convenience and convention, most peripherals have a built-in/permanment male-terminated cord. Can you think of any examples with a female port?

One of my favorite YouTube creators, DIY Perks, made a video about converting USB connectors to USB C which is very well done, as is their usual standard of quality.

https://www.youtube.com/watch?v=V-vFtiDYiIw

Powered usb hubs tend to have a female port for inbound rather than a captive cable. Printers and scanners often have a female port (often usb-B). Some external hard drive docks have female ports, all of mine predate usb-c, so I don't know if the common port has changed.

Things expecting to be charged/powered by usb tend to have female ports --- phones, rechargable video game controllers, espX boards, that sort of thing.

I conceptually equate female ports with host mode devices, but that’s always an assumption that holds true. USB is kind of a mess and I’m glad it all works as well as it does, to be honest, but it’s not without its quirks and rough edges.

The real life USB C experience has replaced the "which side is up" problem with the "is this cheaply made garbage electronic device going to charge at all with my $80 MacBook USB C charger", which it often does not (and instead requires a USB A to USB C charging cable)

I have also seen these issues and always wondered why this happened. There seems to be an issue with the tolerances of USB C compared to A that make C more susceptible to damage and also dirt and dust.

The main issue seems to be lack of resistors in some devices, which leads to USB C not seeing the device to be charged as such, as it isn't negotiating the USB-PD part. USB A doesn’t officially implement a power delivery negotiation spec, it’s just always on at the charger end, with more amps possibly being negotiated if I’m reading properly.

People seem to be able to resolve this issue with a daisy chain. Devices that usually only work with A to C cables might be able to use a C charger connected to a C to A (female) cord or A to C adapter, which is then connected with a standard A to C cable to the device to be charged.

It’s probably easier to keep a USB A charger and A to C cable, but hopefully this helps put your mind at ease that there is a rational explanation.

https://acroname.com/blog/why-usb-c-connections-sometimes-do...

https://plugable.com/blogs/news/understanding-usb-c-charging...

https://en.wikipedia.org/wiki/USB-C

The Reddit post below actually explains how to work around the problem as I mentioned above:

https://www.reddit.com/r/UsbCHardware/comments/w1ismo/how_co...

That’s not how betting works. How much would you really bet, your own real money? For example, I’m totally ready to take the bet at merely 1:1000 odds. In 30 years, let’s say, I’d owe you a $100 if a probe hasn’t broken V1’s distance record, and you’d owe me a hundred grand if we have. In today’s dollars. Should be a no-brainer if you really think it’s impossible.

If we're going to worry about inflation, we might as well worry about the climate burning up our planet.

Maybe I'm being overly pessimistic, but the next ~100 years we'll be bothered trying to have enough food and water and killing ~80% (or more) of humans of the planet who want our food, water, and shelter from the extreme weather that we won't be sending anything to chase the Voyagers...

The only solution is technological advancement.

If humanity doesn’t rise to the challenge (degrowth) this could happen.

Fortunately there are smart people all over the world solving problems everyday and that is likely to continue.

Nah. This is basically the worst of the worst IPCC scenarios, highly unlikely but for some reason the preferred ones by journalists and self-serving politicians as well as big green industry grifters.

I hope we are getting to the point were rationality will prevail again. We need a balanced view of things, having only -1 on this comment of min here, on HN, which by nature is a climate doomer central fills me with hope.

Back of the napkin math shows it to be the most likely, especially with some of the more recent discoveries in regards to water evaporation and co2 emissions.

IPCC is sorely outdated by this point.

And that’s not how long term bookmaking works, as you’ve proposed a wager where I am guaranteed to lose at least the time value of my money on either outcome, and I’m extremely confident I’d lose exactly and only that. But I’ll happily put down $100 in today’s money if a win in 30 years returns a 10% profit over inflation, on the conditions that the probe must be launched from the Earth’s surface after the book is made, that it must overtake Voyager 1’s then distance inside 30 years, and that it must be actively transmitting at least one piece of meaningful local-condition scientific data back under its own power (for validation of ranging purposes, at least) at that time.

Anyone know which SUN workstations those techs were using to "talk" to Voyager?

They seem to be running some sort of Unix yet look quite new ish with their widescreen LCD Displays.

In a brief moment in the trailer for the documentary linked above there is something that looks like an Ultra 24, 27 or 45. That would make it an Intel or AMD based workstation, but they reused that cabinet for a lot of models with minor variations. I believe they had one with an UltraSparc CPU as well.

I always joke that NASA should win the nobel prize in engineering for their work on the mars rovers. where the punchline is that there is no nobel prize for engineering... I didn't say it was a good joke.

But the voyager missions... wow. NASA should totally win the nobel prize in engineering for them. What an accomplishment.

An annual Space Prize, for Engineering.

Maybe people with bonuses these days could fund a prize committee in perpetuity like Alfred Nobel, who invented dynomite.

Voyager 1 is expected to shut down around 2025 because its power source, the Radioisotope Thermoelectric Generators (RTGs), is running out of juice. These RTGs have been gradually losing power since the spacecraft was launched in 1977. As the power drops, Voyager will have to turn off its scientific instruments and other systems, eventually going silent after an amazing run.

It’s funny how yesterday’s submission (mine) only has 75 points and this one 441. Goes to show that the time and date you post something on HN plays an important role.

I remember seeing an analysis on when is the best time and day to post something based on your country, but couldn’t find it now.

Timing is everything... and luck. :)

Me and a colleague of mine once posted essentially the same video of us pushing a coke can across a table, making the sound vaguely similar to Chewbacca.

His video got maybe 100-200 views, and mine got 1.7 million views on YouTube and somewhere between 50 and 100 million views across other platforms. The reason? I happened to post my video to reddit a few hours later, which happened to coincide better with people getting ready for Thanksgiving in the states. I'm from Denmark, so it didn't really cross my mind.

>After the team relocated the code to a new location in the FDS,

I wonder what the protocol for sending update requests is. It sure must be encrypted? If so, what if the encryption algoritm is weak by modern standards, given Voyager 1 is 46 years old, and can be reverse engineered somehow? I.e. can someone outside of NASA send requests to Voyager to change its code?

> can someone outside of NASA send requests to Voyager to change its code?

Unless you've got your own very-very high power transmitters and large dishes, you're not communicating with either Voyager satellite

"Newer" science & research satellites from the late 2000s onward do support a variety of encryption in transit and authentication from the ground stations

Perhaps it’s theoretically possible. But honestly, it’s likely no one would.

Most people hacking into systems are doing so for financial gain or reputational gain. Neither exists here - there’s especially no positive reputation to be had in hacking something 46 years old that likely can’t be fixed again after you do.

There are plenty of vandals out there who don’t care about anything, but the probability one of them would have the skills and hardware necessary to do this is nil.

> Perhaps it’s theoretically possible. But honestly, it’s likely no one would.

> Neither exists here - there’s especially no positive reputation to be had in hacking something 46 years old that likely can’t be fixed again after you do.

This is perhaps the most plainly wrong thing I have read in a long time. Being able to claim "I hacked Voyager" is one of the most ultimate hacker flexes one could possibly perform.

A long long time ago I read an account (which may have been fiction, but had too many details to be casually dismissed) on a very private BBS of someone hacking a NASA space probe over many months. I think it is ridiculous to assume that nobody would try to do this.

So, a memory chip was damaged? And if that is the case, a cosmic ray did it?

[..] "Further sleuthing revealed the exact chip causing the problem, which allowed them to find a workaround. After the team relocated the code to a new location in the FDS, Voyager 1 finally sent back intelligible data on April 20, 2024"

How did the Voyagers avoid hitting asteroids when exiting the solar system? I thought there was a huge cloud of asteroids surrounding our solar system.

You're getting answers about the asteroid belt because you said asteroids, but I believe your question is about the Oort cloud (comets) since you said surrounding the solar system.

From wikipedia;

> Space probes have yet to reach the area of the Oort cloud. Voyager 1, the fastest[60] and farthest[61][62] of the interplanetary space probes currently leaving the Solar System, will reach the Oort cloud in about 300 years[6][63] and would take about 30,000 years to pass through it.

https://www.darthsanddroids.net/episodes/0996.html

> Leia: Chewie, get up here! We're going into an asteroid field! > Han: That's no problem. Just don't hit whatever asteroid might be within a hundred thousand kilometres. > Han: They're in nice stable orbits too, so it's easy to avoid them. > Leia: Okay, fine. We're going into a massive region of randomly moving, closely packed, enormous giant space rocks. > Han: Gaaaaaah!

I know nothing about astronomy, but aren’t the gaps between asteroids pretty huge? Like hundreds of thousands of miles?

I would think if they were close they would just clump together under gravity.

> How did the Voyagers avoid hitting asteroids when exiting the solar system? I thought there was a huge cloud of asteroids surrounding our solar system.

The same way the Saturn probes went right through the rings and didn't hit anything.

Even if it looks like a "cloud" or "ring", that doesn't mean that it is "dense". There are whopping distances between objects in space.

It is way, way, way more difficult to actually "hit" something in space than it is to avoid something.

How they have achieved this to me is completely dark magic. Exotic wizardry. Kudos to the team for bringing it back to life! Meantime on planet earth we need to change our phones and technology gadgets faster than our underwear.

The ability of NASA to keep this system alive is remarkable. They had an expected expiration on Voyager 1 and this far exceeds it. If we could only get such reliability in stuff we bought today. :(

No emulator for these is really sad. That meant we never knew what happen when they decide to reprogram both of them for longer and maintain by remote debugging.

This is one of the few production remote operating computer … and open source it and done an emulation so we can help (or just look) … and even if we want to we cannot hack it from earth. Safe with us.

Instead of the next billion dollar war machine, let's build a railgun on the moon to launch tic-tac sized probes near 1% speed of light in all directions (including past voyager 1)

Space tech is byproduct of military research into ICBM, i.e. nuking the hell out of everyone all at once. Since the cold war end, it's all defunded and not cool. Now the hype is back, so is the funding.

Great idea probably not feasable. The military even with their effectivly unlimited budget recently ended their rail gun programs. One of the main reasons being they require too much maintenance/unreliable. I doubt the moon will be a place that can have effective repair trips.

They can build it using bots.

Develop the bots in the deserts. If they can make them move about and assemble/repair things in a desert, they can handle moon dust.

Granted it's at least a decade long project. But once we've got the bots with AI, they never get tired and can keep building.

Alternately I guess we can slingshot stuff off the sun like the Parker Probe (0.06% speed of light, it's a start)

With the speed of light being a hard limit, should be sending out more probes like this with more and more advanced sensor tech so that our children can see far away things. They will need to know where to send the generation ships.

Voyager 1 was sent using a slingshot that made it possible to achieve its speed. It was a rare opportunity during that time (I did a quick google but couldn't find how rare it was or when we would get such another opportunity)

"speak"

"package"

"touch up"

Odd that the writer called out these words in quotes in the midst of metaphors that were more obvious. I missed the article on the first read through because the writing was so bad.

Anyway, on second read through: amazing they were able to keep teams on this project for nearly five full decades who can still debug this old hardware. Amazing longevity. Talk about maintenance of a code base. 15 billion miles to push a patch. Amazing.

What are the theoretical risks to sending out these beacons… our we at all, as a species, significantly increasing the chance of another life form more advanced than us discovering us by doing this?

If we come into contact with a significantly advanced life form it would certainly lead to ineffable destruction.

Deep space probing without the ability to exert any sort of defense if discovered seems risky. I know the chances are low but what’s the ROI on sending this stuff out without being remotely prepared for contact. I think another comment was saying the data we’ve collected has mostly just been used to confirm preexisting theories. If that’s all we’re getting out of it I’m apprehensive.

I’m just a layman but I’d feel much better if we can establish control, knowledge and dominance of our solar system and its celestial bodies first.

I’m genuinely asking not a conspiracy theorist.

If an alien species can spot something as tiny as Voyager but doesn't notice our activity on Earth which is just a stone's throw away, I doubt they're a threat.

If an alien species finds Voyager in 10,000 years and tracks it back to our planet, they'll find some interesting remains of our civilization.

More like 10,000,000,000 years at least. The closest star is 4.26 light years away. At current speeds (~65000 km/h) it’ll take 40,767,123 years to reach. _IF_ it’s going in the right direction.

It’s doubtful they’ll even find the sun in its current phase

That suggests aliens won't find Voyager until it reaches their star system. If that's the case they probably aren't an interstellar species, and they'll never find us, or visit us. I was assuming they'd detect it while travelling through space.

> If we come into contact with a significantly advanced life form it would certainly lead to ineffable destruction.

This is such a very human thing to say. Why are you humans always projecting your own insecurities onto others like that? We've been among you for millennia now and the only ones destroying your species are you yourselves.

Most cosmic neighbors have evolved to enjoy a good firm anal probe by way of introduction. We are the weird ones, yet again, in our distaste for getting thoroughly probed.

One of the theories floated is if an advanced civilisation made it to us, they would most likely be so advanced they would see us no differently as we would view ants and not even consider us if they needed any resources from our planet.

Another thought is the fact that no advanced civilisation has ever made it to earth is proof that any intelligent species is destined to destroy itself before it can evolve far enough to travel the stars.

Both outcomes are pretty bleak

> Another thought is the fact that no advanced civilisation has ever made it to earth is proof that any intelligent species is destined to destroy itself before it can evolve far enough to travel the stars.

Looking like our planet might prove this one to be pretty close to accurate at least in our case, within the next hundred years or so. If not from nuclear war then from running extremely low of key resources on the planet and suffering a massive conventional war over the remaining resources.

Freshwater alone seems like it can cause it. We already have major cities almost entirely running out of fresh water (see Mexico City this year). Western US came worrying close with Lake Mead's water level a couple years ago too, but thankfully it eventually started raining enough to replenish it again.

> Looking like our planet might prove this one to be pretty close to accurate at least in our case

Sorry, but modern Doomerism needs at least a dozen more orders of magnitude on its confidence that we'll all die before it can claim any part in Fermi's paradox.

Or it could be that inflation never ended and there’s a rapidly increasing number of vacuum collapse bubbles inside it, like ours, in which case approximately every civilisation is the first to exist in their bubble.

The chance of another live form discovering us due to the Voyager probes is ~0. Atmospheric changes and EM emissions from Earth are both detectable from far longer ranges.

From what I understand space is full of errant radio signals that are not generated by us, the beacons we send to voyager or it to us is most likely indistinguishable from the multitude of others in the same region.

I think the idea of an alien race attacking us is sort of a catch 22 because if they’re able to attack us (technologically speaking), then they wouldn’t perceive us as a threat because we would be insignificant in comparison to their power.

"From what I understand space is full of errant radio signals that are not generated by us"

But stars and other natural sources emit a different radio signal than all the things we have on earth, that we transmit into space.

I think we're vastly more likely to destroy ourselves with resource depletion as opposed to the paranoid "dark forest" outcome from three body problem. I wouldn't be surprised if we get to "oh, hey. What's up?" as far as alien communication and that's it.

What resource’s depletion do you imagine is going to do us in?

I’m somewhat skeptical of climate change causing a civilization ending process, yet I find that vastly more likely than us running out of something.

My way of thinking about it is that a civilization capable of interstellar travel has enough energy and resources (which is probably the same) to terraform any “free” planet to their liking. For all we know, space is mostly devoid of any life. So you can build intergalactic empire for 100,000 years and still not encounter anyone. I see no point for such advanced species to conquer someone. The Dark Forest is an interesting concept but seems unlikely.

How do I put this gently?

Your species is already extinct.

Your species is really just waiting to find out what caused that extinction.

That cause, almost certainly, will have been its own actions in its own local environment.

Essentially, your species will almost certainly have shit in its own backyard, and eventually its mouth, to death.

It will likely do so within the next 100,000 years.

The odds of Voyager, or any, emission or artifact made by your species being encountered by another life form capable of all of receiving it, recognizing it, understanding it, and responding to it in any manner within that timeframe is, essentially, zero. Not precisely zero, but near enough.

The odds of that species having malevolent intent and arriving in time to do anything but engage in archaeology? Now you’re reaching actual zero.

Worrying about this particular existential risk isn’t just premature, it’s prenatal.

Species go extinct but also evolve. In 100000 years today’s civilizations might fall but there would still be some carbon based lifeforms. Perhaps tiny, furry humans; maybe with a dislike for digging up fossil fuels.

Kind of definitionally if it goes extinct it’s done evolving. And sure, plenty of carbon-based life forms — currently all known life forms — will survive, and hopefully whatever does is smart enough to learn from our own-goals. It may even be another primate or another hominid… what it won’t be is us.

Note that on a cosmic scale, hominid, primate, or even carbon based might count as us. On a human scale, after 100000 years it wouldn’t be us in any case.

Get our reproduction cycle to be based on advanced tech. Then let society collapse so it doesn't have the tech anymore. Will take a few generations still.

> If we come into contact with a significantly advanced life form it would certainly lead to ineffable destruction.

I would expect an advanced form of life to be nice. Maybe humans will aspire to that some day too.

I'd also expect an advanced form of life to have discovered game theory and analyzed potential interaction with other civilizations as a sequential game with imperfect information (I'm assuming no FTL so nobody has current knowledge of anyone else's capabilities).

The results are pretty scary. PBS Space Time had an episode on this recently [1] which goes into more detail. Briefly, if you put survival of your planet over all else, "destroy aliens as soon as you become aware of them" has a better outcome for you than "contact them" or "ignore them".

It's the speed of light limit that is the problem with the "contact them" option. If they are not nice and go for destroying you, which they do by sending some heavy masses at you at relativistic speeds, you don't find out about until it is too late to launch a counter attack so there's no "mutual assured destruction" deterrent like the one that has kept us from using civilization ending weapons on Earth.

The Space Time episode does go into possible reasons that advanced aliens might not value their own survival so highly that the risk of them being destroyed by not picking "destroy" is outweighed by the benefits of contact or ignoring others.

[1] https://www.youtube.com/watch?v=aXYf47euE3U

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