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Genuinely wondering why you mention “in a vacuum”, as the signal would have to go through the atmosphere.

For the inter-satellite links. First and last hop still need to pass from the ground to LEO.

The obvious solution is to start yeeting compute and/or users into space.

I vote for users. I'll stay down here with compute, I know how this ends.

Atmosphere is practically vacuum as far as speed of light goes.

Fiber optic: 0.67c Atmosphere: 0.9997c Vacuum: 1c