Voyager 1

I still cannot believe NASA managed to re-establish a connection with Voyager 1.

That scene from The Martian where JPL had a hardware copy of Pathfinder on Earth? That’s not apocryphal. NASA keeps a lot of engineering models around for a variety of purposes including this sort of hardware troubleshooting.

It’s a practice they started after Voyager. They shot that patch off into space based off of old documentation, blueprints, and internal memos.

Imagine scrolling back in the Slack chat 50 years to find that one thing someone said about how the chip bypass worked.
- Imagine any internet company lasting 50 years.
To add to the metal, the blueprints include the blueprints for the processor.
https://hackaday.com/2024/05/06/the-computers-of-voyager/
They don't use a microprocessor like anything today would, but a pile of chips that provide things like logic gates and counters. A grown up version of https://gigatron.io/
That means "written in assembly" means "written in a bespoke assembly dialect that we maybe didn't document very well, or the hardware it ran on, which was also bespoke".
- They also released the source code of the Apollo 11 guidance computer. So if you want to fly to the moon, here is one part of how to do it.
I realize the Voyager project may not be super well funded today (how is it funded, just general NASA funds now?), just wondering what they have hardware-wise (or ever had). Certainly the Voyager system had to have precursors (versions)?
Or do they have a simulator of it today - we're talking about early 70's hardware, should be fairly straightforward to replicate in software? Perhaps some independent geeks have done this for fun? (I've read of some old hardware such as 8088 being replicated in software because some geeks just like doing things like that).
I have no idea how NASA functions with old projects like this, and I'm surely not saying I have better ideas - they've probably thought of a million more ways to validate what they're doing.
- The Hard Fork podcast had a pretty good episode recently where they interviewed one of the engineers on the project. They’d troubleshooted the spacecraft enough in the past that they weren’t starting from square one, but it still sounded pretty difficult.
- They apparently didn't have an emulator. The first thing I'd have done when working on a solution would have been to build one, but they seem to have pulled it off without.
- There is an fascinating documentary about the team that sends the commands to Voyager 1 and 2 called It's Quieter in the Twilight
- 100% they've got an emulator, they've had dedicated test environments since the moon landing for emulating disaster recovery scenarios since the moon landings, they've likely got at least one functioning hardware replica and very likely can spin up a hardware emulation as a virtual machine at will.
  Source: I made this up, but I have a good understanding of systems admin and have a interest in space stuff so I'm pretty confident they would have this stuff at bare minimum

To me, the physics of the situation makes this all the more impressive.

Voyager has a 23 watt radio. That's about 10x as much power as a cell phone's radio, but it's still small. Voyager is so far away it takes 22.5 hours for the signal to get to earth traveling at light speed. This is a radio beam, not a laser, but it's extraordinarily tight beam for a radio, with the focus only 0.5 degrees wide, but that means it's still 1000x wider than the earth when it arrives. It's being received by some of the biggest antennas ever made, but they're still only 70m wide, so each one only receives a tiny fraction of the power the power transmitted. So, they're decoding a signal that's 10^-18 watts.

So, not only are you debugging a system created half a century ago without being able to see or touch it, you're doing it with a 2-day delay to see what your changes do, and using the most absurdly powerful radios just to send signals.

The computer side of things is also even more impressive than this makes it sound. A memory chip failed. On Earth, you'd probably try to figure that out by physically looking at the hardware, and then probing it with a multimeter or an oscilloscope or something. They couldn't do that. They had to debug it by watching the program as it ran and as it tried to use this faulty memory chip and failed in interesting ways. They could interact with it, but only on a 2 day delay. They also had to know that any wrong move and the little control they had over it could fail and it would be fully dead.

So, a malfunctioning computer that you can only interact with at 40 bits per second, that takes 2 full days between every send and receive, that has flaky hardware and was designed more than 50 years ago.

And you explained all of that WITHOUT THE OBNOXIOUS GODDAMNS and FUCKIN SCIENCE AMIRITEs
- Oh screw that, that's an emotional post from somebody sharing their reaction, and I'm fucking STOKED to hear about it, can't believe I missed the news!
Finally I can put some take into this. I've worked in memory testing for years and I'll tell you that it's actually pretty expected for a memory cell to fail after some time. So much so that what we typically do is build in redundancy into the memory cells. We add more memory cells than we might activate at any given time. When shit goes awry, we can reprogram the memory controller to remap the used memory cells so that the bad cells are mapped out and unused ones are mapped in. We don't probe memory cells typically unless we're doing some type of in depth failure analysis. usually we just run a series of algorithms that test each cell and identify which ones aren't responding correctly, then map those out.
None of this is to diminish the engineering challenges that they faced, just to help give an appreciation for the technical mechanisms we've improved over the last few decades
- pretty expected for a memory cell to fail after some time
  50 years is plenty of time for the first memory chip to fail most systems would face total failure by multiple defects in half the time WITH physical maintenance.
  Also remember it was built with tools from the 70s. Which is probably an advantage, given everything else is still going
- what we typically do is build in redundancy into the memory cells
  Do you know how long that has been going on? Because Voyager is pretty old hardware.
Is there a Voyager 1, uh...emulator or something? Like something NASA would use to test the new programming on before hitting send?
- Today you would have a physical duplicate of something in orbit to test code changes on before you push code to something in orbit.
Huh. If it survives a few years more, it's a lightday away.
~~They have spare Voyager on Earth for debugging~~
EDIT: or not

Still faster than the average Windows update.

More stable, too.
- Absolutely. The computers on Voyager hold the record for being the longest continuously running computer of all time.
Microsoft can't even release a fix for Window's recovery partition being too small to stage updates. I had to do it myself, fucking amateurs.
- Can't or won't? The same issue exists for both windows 10 and 11, but they haven't closed the ticket for windows 11.... Typical bullshit. It's not exactly planned obsolescence, but when a bug comes up like that they're just gonna grab the opportunity to go "sry impossible, plz buy new products"
- Not to mention what a bitch that partition is when you need to shrink or increase the size of your windows partition. If you need to upgrade your storage, or resize to partition to make room for other operating systems, you have to follow like 20 steps of voodoo magic commands to do it.
NASA should be in charge of Windows updates!
- If they were it wouldn't be Windows
Certainly better tested.
- Well, they only had to test it for a single hardware deployment. Windows has to be tested for millions if not billions of deployments. Say what you want, but Microsoft testers are god like.

Interviewer: Tell me an interesting debugging story

Interviewee: ...

Heh. Years ago during an interview I was explaining how important it is to verify a system before putting it into orbit. If one found problems in orbit, you usually can’t fix it. My interviewer said, “Why not just send up the space shuttle to fix it?”
Well…

It's hard to explain how significant the Voyager 1 probe is in terms of human history. Scientists knew as they were building it that they were making something that would have a significant impact on humanity. It's the first man made object to leave the heliosphere and properly enter the interstellar medium, and this was always just a secondary goal of the probe. It was primarily intended to explore the gas giants, especially the Jovian lunar system. It did its job perfectly and gave us so many scientific discoveries just within our solar system.

And I think there's something sobering about the image of it going on a long, endless road trip into the galactic ether with no destination. It's a pretty amazing way to retire. The fact that even today we get scientific data from Voyager, that so far away we can still communicate with it and control it, is an unbelievable achievement of human ingenuity and scientific progress. If you've never seen the image the Pale Blue Dot you should see it. That linked picture is a revised version of the image made by Nasa and released in 2020. It's part of a group of the last pictures ever taken by Voyager 1 on February 14th 1990, a picture of Earth from 6 billion kilometers away. It's one of my favorite pictures, and it kinda blows my mind every time I see it.

The pale blue dot photo always makes me tear up. We're so small and insignificant in such a grand universe and I'm crushed that I can't explore it.
- There will always be a "step further we'd love to see but won't". Let's be glad we're in that step which included this photo and the inherent magnificence in it.
  It totally beats being one of the earlier humans who just wondered what the lights in the sky might be. Probably gods or something.

I think the term "metal" is overused, but this is probably the most metal thing a programmer could possibly do besides join a metal band.

Or activate Skynet.

I was already impressed when they managed to diagnose a single bit flip a few years ago.

Keep in mind too these guys are writing and reading in like assembly or some precursor to it.

I can only imagine the number of checks and rechecks they probably go through before they press the "send" button. Especially now.

This is nothing like my loosey goosey programming where I just hit compile or download and just wait to see if my change works the way I expect...

they almost certainly have a hardware spare, or at the very least, an accurately simulated version of it, because again, this is 50 year old hardware. So it's pretty easy to just simulate it.
But yeah they are almost certainly pulling some really fucked QA on this shit.

Man I can’t even get my stupid Azure deployment to work and that’s only in Germany.

As someone who recently switched from AWS to Azure I feel your pain.
Best part is when you finally have a working solution, Microsoft sends you an email that it's being deprecated.
- What's wrong with AWS in your usecass?

Rejected : please comment your changes

I wont even upgrade the BIOS on my motherboard because im afraid of bricking it.

As a teenager I experienced a power outage while I was updating my bios.
Guess what happened?
I’m still bitter about it.
- You can negate that risk by getting a UPS. You should get a UPS in any case imo since even a shitty one lets you at least save your work and shutdown properly if your electricity drops.
I updated mine a couple of weeks ago. I was actually really anxious as It went through the process, but it worked fine, at first...
Then I found out Microsoft considered it a new computer and deactivated windows. (And that's when I found out they deleted upgrade licences from windows 7 & 8 back in September)
- That's Microsoft in a nutshell for ya.
- Posting from Linux then?
Buy spare flash chip

Why do Tumblr users approach every topic like a manic street preacher?

There's a significant overlap between theatre kids and Tumblr users.
- That ven diagram is maybe 3 degrees away from a circle.
- Thank you, now I can't stop hearing them in Alan Tudyk's Clayface voice from the Harley Quinn series...

My understanding is that they sent V'Ger a command to do "something," and then the gibberish it was sending changed, and that was the "here's everything" signal.

And yeah, I'm calling it V'Ger from now on.

They specifically sent it a command to send a full memory dump after it went haywire. It wasn't a fluke.
- Sure - I didn't know what "something" was. And what I'd read was that someone had to figure out that they were receiving a full memory dump, which suggested to me that they hadn't specifically asked for that.
And yeah, I'm calling it V'Ger from now on
Have my upvote.
Why haven't we been doing this already? I'm with you, let's make this happen!
- Only so long as we ensure we keep a stable humpback whale population. I don't wanna be the guy that has to figure out how to make a temporal slingshot maneuver work.
- Stop trying to make V'ger happen! Its not going to happen!
From what I read there was damage to the memory in certain places so they've had to move the code into spare places in memory.
It's an astounding feat tbh.
- One specific chip had damaged memory
The vaginer

When I hear what they did, I was blown away. A 50 year old computer (that was probably designed a decade before launching) and the geniuses that built that put in the facility to completely reprogram it a light-day away.

Great documentary on the Voyager team: It's quieter in the twilight

I prefer the sequel Star Trek: the motion picture.
- V'ger 2: 2patch2furious

People always underestimate the high level NASA works at. Everyone bitches and moans, especially Musk simps, about how long SLS took to make and its expense, but it worked right the first time. In the case of the Voyager spacecraft, they are working with tech so old, all the original engineers are retired or dead. NASA rocks.

I understand your point and completely agree that NASA has produced some amazing technological feats, but we could probably use a different example than the SLS to highlight their accomplishments. Even with supposedly repurposed rocket engines and technology from the Shuttle era, that project is billions of dollars over budget and years behind schedule. If you want to highlight how amazing it is that SLS has actually flown with all the political manipulations associated with it, then I'd probably agree with you in that sense. This is no criticism of the engineers, but to completely ignore the issues of this project as a whole, not just financially related, seems to be a bit disingenuous.
Here’s a good article from Berger talking about what the Government Accountability Office thinks of the project: https://arstechnica.com/space/2023/09/nasa-finally-admits-what-everyone-already-knows-sls-is-unaffordable
- The budget wasn't really relevant to my point. And it did work correctly the first time.

OTS flashing.

Like OTA but with space rather than air.

OTV (void)
- If we flash our phones here on Earth, we lose our warranty, wtf

I wonder how it is secured, or could anyone with a big enough transmitter reprogram it at will...

Modern satellites are protected by various means of encryption, but there’s an enthusiast community that tracks down and communicates with very old unencrypted zombie satellites. There’s even been an NGO which managed to fire rockets on an abandoned NASA/ESA probe (with their approval.)
The Voyagers benefits primarily from the lack of groups with an adequate deep space network to communicate with it. Their communication standards are otherwise completely open and well documented.
- "Yeah, I always leave my car unlocked with the keys inside. I also always park it in the center of a lake."
- Thanks for that link, cool stuff!
I think the security is adequately managed by the need for a massive transmitter as well as the question "what is there to gain via a hostile takeover and re-programming the probe?"
I bet there's actual security of some kind going on, but those two points seem like a massive hurdle to clear just to mess with a deep space probe.
- what is there to gain via a hostile takeover and re-programming the probe
  "We did it for the lulz".
You may be interested in learning about its downlink: https://destevez.net/2021/09/decoding-voyager-1/
Lol.
Why is it only sending back dickbutt memes?
Its partially because there is only one set of antennas large enough to communicate with it, and that's only sometimes. Its called the Deep space network and it is very secure because it's used for many things, not just communicating with the Voyager probes.
Second, you'd have to have very very intimate knowledge of the hardware, and programming language to even begin to hack it. And the people who do have that knowledge are very very passionate about their probes.
So I guess technically the answer is yes. But practically, no.

I just have to imagine how interesting of a challenege that is. Kinda like when old games only had 300kb to store all their data on so you had to program cool tricks to get it all to work.

No yeah, it's like that plus the thing is a light day away, and on top of that malfunctioning on a hardware level. Incredible
- It’s like you already have a 300kb game on a cartridge, but it doesn’t work for some unknown reason. Also you don’t actually have the cartridge, some randy in Greenland does. And they only answer emails once every 2 days or so.

Fuck it, we'll fix it live

It reminds me that there are still very intelligent and talented people within our ranks. A nice breath of fresh air.

SWEs have new standards now, and i think we should hold them to it. Considering how shit most modern websites are these days. I think it's only going to be beneficial.

Say that to corporate. I'm perfectly willing (eager, even) to write actually good software, but I'm forced to work within a budget and on top of the pile of despair we call "tech stack". Everything is about 20 orders of magnitude more complex than it needs to be, nobody has time to do anything properly and everything is always kind of burning.
- username checks out

**This also means that aliens can reprogram all of our satellites. **

Yes if they can track them in middle of space.
It's impressive that we can still send data to the satellite. I mean you need to send the signal to the place where the satellite will be in 24 hours.
No, it doesn't. Commands could be authenticated using a pre-shared secret. Even public cryptography existed prior to Voyager 1's launch (by a year).
Based on the state of computer security at that time I would guess that's unlikely, but then again it was the Cold War.
Anyway, just because it is possible it doesn't mean anyone can do it.
- If they had a way to affect our technology in a meaningful way at interstellar distances we can assume their understanding of mathematics is significantly more advanced than ours.
  If their understand of mathematics is that much more advanced we can assume that their knowledge of cryptography is also much more advanced.
  They'd probably be able to crack our encryption fairly easily.
- you say that like aliens wouldn't just acquire the hardware itself. If there are aliens, and they know about the probe, chances are they're probably in a better position to fuck with it than we are. From a computing power angle (i.e. it's easy to crack) as well as hardware level.
Nearly all such satellites would have highly directional antennas, so the aliens would have to be neat earth before they could do that. Voyager is not expecting a command signal from anywhere else but Earth. The signal would have to originate not more than a fraction of a degree from Earth from Voyager's perspective.
- So they just need to go behind it?
Wasn't there a documentary about this?
- Star Trek the Motion Picture

Let's hope the over-the-air update didn't get Man-In-The-Middled...

And the IT support service can't even fix a computer problem of an customer 20 km away.

I'd also be surprised if anyone working on the project was even alive when the code was written.

Imagine being the guy who crashed the probe working with this guy.

Damn impressive as hell . Also on a completely unrelated note how is this a meme ? Not saying i mind it being here because i do like it just saying maybe not the /c/ ? I don't mind either way .

My friend, just let the memes flow. You do not need to understand or gatekeep.
- Wait gatekeep ? Which part of my comment looks like i wanna gatekeep anything ?

Meanwhile here on Earth, we need to login using two accounts to access Helldivers 2. And even got pulled from many countries. What a time to be alive.

Sony has agreed to remove psn requirements for pc users now