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Comment by Ajedi32 | Hacker News Reader

What makes you so sure? SpaceX already has thousands of 6 kW networking racks flying around in LEO and they dissipate their heat just fine, and are plenty cost-effective. You think they can't do any better than that with a new design specifically optimized for computing rather than networking?

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Probably, but they likely can't do better than we can do on Earth. Networking in space offers specific advantages that are not easy to replicate on Earth. Data centers in space don't have clear advantages beyond easily debunked ideas about cooling and power.

I'm not talking about the whole idea, just the heat dissipation part. So many people in this thread seem so sure this is impossible because you can't radiate heat in space, completely ignorant to the fact that SpaceX is already dissipating over 20 MW of solar power in LEO in a reasonably cost-effective manner.

The advantage of 24/7 solar power is clear, obvious, and undeniable, it's just a question of whether that's outweighed by the other disadvantages.

The solar panels on the newest satellites can deliver 6kW but the power that satellite actually uses is less. The satellite is only using 300W[1] during the dark phase of it's orbit when it can use it's entire mass to cool down. Is that limit because of the battery or is it because the satellite needs to radiate all the heat it acquired from the other half of the time in the sun?

[1] https://lilibots.blogspot.com/2020/04/starlink-satellite-dim...

Looks like that's a purely speculative assumption the blog author made, not a fact. I'm not sure why he made that assumption given that Starlink doesn't actually stop working at night.

Fair point that in SSO you'd need 2-3x the radiator area (and half the solar panels, and minimal/no batteries). I don't think that invalidates my point though.

Article doesn't say the satellites stop working in their dark phase, it says they consume 300W in the dark phase based on some battery math.

If the satellite requires ~3,000 W to work in the light phase (based on solar panel size), then reducing that to 300 W during the dark phase would most definitely require it to "stop working".

The battery math is based on purely speculative assumptions the author made about cycle lifetimes. It's not grounded in any real, concrete information like the solar panel power calculations are.

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