Comment by svantana
7 hours ago
I dunno if it's that clear cut. In space with a shadowless orbit you get 5x more solar energy per day than the sunniest place on earth. And it's always on, so you don't need batteries. Also, the lack of gravity and weather means that the structures can be a lot more brittle - I imagine something like a gpu on the back of a large thin film solar panel, where the panel also acts as heatsink. Could be pretty cheap!
while there may not be atmospheric weather, low earth orbit has its own "weather". Before you even reach LEO you start getting bombarded by all forms of energetic particles. None of these are things you want your computers saturated with
Yes, you get much more radiation from the sun and other sources. How do you do cooling? Radiators the size of small moons?
Also hard radiation is not something transistors like.
The joint solar panel + computer system will be pretty close to an ideal black body, which near earth will have an average temperature of about 10°C. And radiation is an issue, but starlink seems to work so I don't see why this wouldn't.
Of course it works, the question is how this would look like and if its financial feasable.
You make a H100, ship it to a space dock, load it onto a rocket (rocket requires fuuel, the rocket, etc.) send it up, deploy it, monitor it live 24/7, have means of adjusting its orbit, if it breaks, its immediade full loss, otherwise it will degenerate faster in space than on earth, now it needs a high speed up/downlink to do anything reasonable which also requires a base station. The base station has to track this satelite.
One H100 costs 40k, consumes 700 Watt peak and need probably at a minimum 5 square meter of area for cooling and solar.
The colossus datacenter from musk has 250.000 of these.
Now you have to track 250.000 single satelites, you have to coordinate the communication between the, up and downlink to earth.
250.000 * 5 square meter of area.
This alone increases the potential debris in space.
And this is ONE 300 MW Datacenter replacement. ONE.
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More energy will be required than radiation absorbed by a spherical (ish) data center. You'll have massive solar panels piping energy in, and so the temperature would by higher than thermal equilibrium at that distance.
Starlink does not need so much energy as a datacenter.
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You can only cool by radiation in space. You may get more energy from the sun but how are you going to get rid of all the heat fast enough?
How hot do you think black objects in space get? Something like 10°C. Look up thermal equilibrium of an ideal black body.
In the vicinity of the Earth, they get to about the temperature of the Earth. That’s not a coincidence. Hotter if they are actively generating heat.
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But are they doing work internally that generates heat? Genuine question.
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Its not always on. Its only 'always' on if you would orbit the sun which starlink can't do, it has to orbit the earth. This only works in a certain constelation which would create a halo around our planet, without clear understanding what even would do.
The more power you consume, the more power you need to dissipate. These constelations wouldn't be small at all. It would also take a interesting solution to be able to move this heat from very small very intense areas to very big cooling areas. How?
And space is not easy. Space is very very cold which puts a lot of stress on materials. It has radiation. And it has A LOT of microasteroids. Stuff in Space breaks down due to this. You would need to replace all of this stuff regularly with resources from the planet earth.
You would basically just spend a lot of resources throwing a lot of resources out into space. You can't even recycle all of this.
Its still lunatic at our current state of our current system. There is so so much space on our planet. Its ridicoulous
The only reason Musk is saying stuff like this is because he knows there is no market and he needs to keep his system alive
The always on orbit exists and is called a dawn-dusk Sun synchronous orbit. It is an orbit that is always above the terminator (line between night and day) where it can face the Sun 100% of the time.
This orbit has to rotate about a degree every day to follow the terminator as the earth orbits the Sun. It uses the equatorial bulge of the earth to achieve that rotation without have to spend rocket fuel. It is really quite interesting.
But the slots on such Sun-synchronous orbits are limited and many applications want them.
A few datacenters could occupy some slots, but it would be difficult to accept a large number of datacenters obstructing such orbits.
Aren't dusk-dawn orbits already the most crowded orbital space with the most orbital debris?
A polar low earth orbit can be always-on (no earth shadow). Each satellite will be in thermal equilibrium, around 10°C. Catastrophic destruction from micrometeoroids is rare. I'm not saying it's a good idea, but I don't see any dealbreakers in the math/science.
Kessler Syndrome is the biggest dealbreaker. We're already fairly far advanced in that scenario from Starlink, and competitors/scaleouts to Starlink promise to be worse.
If you plug eleventy trillion dollars of hope that the aristos can finally replace the working class into the issue, Earth loses access to low orbit from orbital debris almost immediately.
Their entire mindset cannot deal with this. Low orbit is a physically-enforced type of commons, inextricably tied to tragedy if overpopulated. You cannot privatize it and scale indefinitely. There is no defense, and any pissed off individual actor who gets malicious can burn it to the ground.
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