That’s far out!
It is just incredible to me that we have the ability and knowhow to send instructions to a 40 year old transistor computer to reprogram itself and get it working again with just radio signals.
What they did was close to wizardry.
With no way to fix the chip, the team instead split the code up so it could be stored elsewhere. Initially they focused on reacquiring the engineering data, sending an update to Voyager 1 on 18 April 2024.
It takes 22.5 hours for a radio signal to travel the 24 billion kilometres (15 billion miles) out to Voyager 1, and the same back, meaning the spacecraft’s operations team didn’t receive a message back until 20 April.
But when it arrived, they had usable data from Voyager 1 for the first time in five months.
https://www.skyatnightmagazine.com/space-missions/how-fixed-voyager-1
Here’s a fun fact that I think of every time I read about light delay.
We assume the speed of light is the same in all directions but there’s no way to prove that it is.
It could be light speed is instantaneous in one direction, and half the speed we think it is in the reverse. Any test we could devise depends on information traveling in two directions, nullifying any discrepancies in light speed.
… but there is a way, and it has been proven.
One of the more memorable physics classes I’ve had went into the history of discoveries that led to our understanding of relativity. The relevant story here, starts with how sound travels though air.
Let’s say you’re standing at the bottom of a building shouting to your friend peeking out a window on the 5th floor. On a calm day, that friend will hear you at pretty much the same time as someone standing the same distance away, but on the street. However, if it’s windy, the wind pushes around the air through which the sound of your voice is traveling, the friend up in the window will have a slight delay in receiving that sound. This can of course be verified with more scientific rigor, like a sound sent in two perpendicular directions activating a light.
Scientist at the time thought that light, like sound, must travel though some medium, and they called this theoretical medium the Aether. Since this medium is not locked to Earth, they figured they must be capable of detecting movement of this medium, an Aether wind, if you will. If somehow the movement of this medium caused the speed of light in one direction to be faster than another due to the movement of this medium, measuring the speed in two directions perpendicular to each other would reveal that difference. After a series of experiments of increasing distances and measurement sensitivities (think mirrors on mountain tops to measure the time for a laser beam to reflect), no change in the speed of light based on direction was found.
Please enjoy this wikipedia hole: https://en.m.wikipedia.org/wiki/Michelson–Morley_experiment , and please consider a bit of caution before you refer to things as facts in the future!
How does the double slit experiment work into this?
As far as I’m aware, what you cited only proves that there is no ether that acts on light in a way such that the round trip time in the direction of ether travel is different from the round trip time in the direction perpendicular to ether travel.
It’s not merely that:
somehow the movement of this medium caused the speed of light in one direction to be faster than another due to the movement of this medium, measuring the speed in two directions perpendicular to each other would reveal that difference.
Instead, it’s that the speed of light must be different in the two directions in a way such that their round trip times don’t average out to the same average as in the other direction.
The theories of ether at the time predicted such a round trip difference because of the wind like interactions that you say.
I believe that this in no way proves anything about the one way speed of light. The Michaelson Morley inteferometer only measures difference in round trip time.
(Insert comment about the irony of your last statement). See https://en.m.wikipedia.org/wiki/One-way_speed_of_light
The speed of light in a vacuum unaffected by external forces such as gravity should be the same no matter what direction it is in. I’m not sure why it wouldn’t be. That’s like saying a kilometer is longer if you go East than if you go West.
However, it’s actually far more complicated than that, and much of it beyond my understanding.
https://math.ucr.edu/home/baez/physics/Relativity/SpeedOfLight/speed_of_light.html
That said, direction should not matter.
There’s no reason it wouldn’t be. The point is that it’s impossible to prove that it is. There is no conceivable experiment that can be performed to prove the two-way speed of light is symmetric.
That’s not how anything works. It’s impossible to prove that the universe wasn’t created last Thursday with everything in place as it is now. There’s no point in assuming anything that can’t be proven has validity.
It’s just a thought exercise. There are several reputable YouTube videos on this topic. None of them claim that the speed of light isn’t the speed of light. They’re just demonstrating that we can’t prove it with current technology. Similar to the difficulty it took to finally prove that one plus one equals two. We know that’s correct, but it took years to prove it.
…but that’s exactly what you’re doing. The fact that light travels at the same speed in all directions cannot be proven. You’re the one insisting that it does.
Couldn’t we send out two devices in different directions, wait a decade, have them shine light at eachother simultaneously, record when they receive the light, then send the times back to earth?
Your question is good. You’re missing understanding of time dilation and frame of reference. An explanation of the theory of relativity is at least pages long.
The first book I ever read on the subject, and IMO the best introductory text for any non-physiscist, is Stephen Hawking’s “A Brief History of Time”. But, any introduction to relativity should answer your question.
Another interesting way to conceptualize it is that the speed of light is infinite and it’s causality/information that is limited to c. You shine a light at the moon and it takes 1.3 seconds for the “fact” that the light was turned on to propagate that far.
Cixin Liu imagines exactly that towards the end of the Three Body series. Among other things, which make the series worth absolutely slogging through at points.
…from 15.2 BILLION miles away.
And it can reply by basically shining a (very high-frequency) flashlight back at us.
Incredible is the right word, how does this still work after more than 47 years? How do they even still have energy to send and receive signals? That’s one heck of a durable power source. How do the computers and sensors still work? The reliability and durability of these probes is amazing. NASA truly had some reality wizards doing what seems like magic to accomplish this.
Either that or, aliens have been helping out and repaired it from time to time.
How do they even still have energy to send and receive signals?
They’re apparently on their last legs now in terms of being able to keep all the instruments running.
The Voyagers have enough electrical power and thruster fuel to keep its current suite of science instruments on until at least 2025.
They’ve been on their last legs for decades now
How do they even still have energy to send and receive signals? That’s one heck of a durable power source.
It’s literally decaying plutonium-238. And because it decays, it’s putting out less power than when it started. They’ve shut down certain operations to conserve power, and obviously prioritize things like communication back to earth.
How do they even still have energy to send and receive signals? That’s one heck of a durable power source.
Nuclear power, it packs a punch!
Fuck aliens
Same. That was incredible.
47 year old probe. Damn near 50
It’s literally the most far out object there is
It’s like the Jason Vorhees of spacecraft
That’s just Jason X.
I’d pay to see Voyager beat a teenager to death with another one in a sleeping bag. Sounds compelling.
V’ger has evolved
I was looking for this comment, else I would have been very disappointed
Live Long and Prosper
Anyone ever sometimes think, that there’s an alien species that kinda feels a little paternal towards us and keeps fixing out Tonka Toys because it makes us happy?
Screw thanking aliens, it’s an incredible team of engineers that have the skills and dedication to do what seems impossible. This was 100% humanity at its best.
They rebuilt the most critical core code on a near antique spacecraft that has effectively left the solar system over an equally ancient radio link. They had 1 shot, and nailed it.
Exactly. If there’s anything that we can point to and say “humanity, fuck yeah” this is it. Giving thanks to aliens or to gods is an insult to the hard work of the HUMANS that accomplished this.
Exactly. NASA has proven beyond a shadow of a doubt that there is no God, the earth is a ball, we can trust our governments and large institutions, and manned space flight was a '70s trend back when the economy was better. We still have them to thank for Velcro and Tang my dudes
Did they have eeproms in the 70s? It’s just mind blowing. These nerds are next level.
Naw, so Apollo was built with curtain rods and used candles for thrust
https://moon.nasa.gov/system/resources/detail_files/188_detail_as11-40-5927_orig.jpg
Yes ra ra NASA is totally legit and a shining example of the best achievements of humanity for sure. Nothing sketchy about it. It is amazing though to think how manned space flight is the only technology to not only lack progress in the last 60 years, but has actually regressed. I really wish these hero scientists could get back to working on manned space flight so we can ditch this whirling spaceball
This is disrespectful towards the achievements of the human race. My father kept attributing all of our recent technology to “the findings at roswell” and i have very strong feelings towards this position.
So much agreeance. I can see how people may be awestruck by recent technology, but crediting it to extraterrestrial life both completely ignores the gradual progression of knowledge which enabled it and disregards the brilliant minds who spent their lives bringing it to fruition.
Provided we engineer them well, this is good news for truly deep space operations. Cosmic radiation and interplanetary gasses could (and probably do) wreak havoc on various materials, but apparently technology from the 70s is capable of handling it very long term.
Now if we could just get out of these squishy meat suits we’d be in business.
Solid state tech using minerals and metals for interstellar travel.
Squishy meatbag for living and reproducing on a goldilocked planetoid.
We should just turn into comets for the purpose of travelling 🐌 slow but effective
I try to diagnose the carburetor in my 50 year old Jeep sitting right in front of me, and I still can’t get it running right.
These people are amazing, and the people that built that so it can still be fixed out in the Oort Cloud were even better.
What’s the baud rate and have they needed to adjust it over time?
Not baud, but actual data rate returned:
https://voyager.jpl.nasa.gov/mission/science/
Science data are returned to earth in real time at 160 bps
That “real time” on out of earth scale always boggles my mind. Technically it is as fast as it possibly could, knowing that radio waves travels at the speed of light. But damn, that light has to travel for a long time before arriving so “real time” data that arrives is technically “quite old” data.
As far as it is, it’s still just under one day at light speed.
Imagine the ping & jitter…oh…god…
The latency to Voyager 1 is apparently a bit under 23 hours, so yeah, that’s gonna be painful.
I’d guess that the jitter is probably zero.
Like, if they can pull data in realtime, I assume that they’ve chosen an encoding with enough redundancy that data can get through reliably at that rate. Because of the latency, they’d have to have a huge buffer if they wanted to have some protocol that required frequently requesting retransmits.
You could play chess or other turn based games. Imagine playing Alpha Centauri connected to a space probe… They should integrate this for the next probe.
As long as they add Doom as well.
Doom would be for Aliens only
The ping is about 180,000,000 ms
Not great for games…
Absolute Chad.
🫡
o7
this detecation is impressive.
People will believe anything lol
