Stanford physicist argues space compute cooling is feasible with a black-sphere thought experiment
shaunmmaguire · x · 2026-11-03
Sequoia's Shaun Maguire shares an argument from Stanford applied physics professor Amir Safavi-Naeini (intuition from David Schuster) against claims that cooling makes space compute impossible.
- A black sphere in orbit absorbing sunlight and radiating to the 3K background reaches equilibrium at 300K, same as Earth at this distance from the sun
- A satellite with solar panels is no different: the geometric factor is order-unity, computers inside don't change the argument — you only need to spread the heat
- The confusion stems from thermal intuition built on externally powered systems (wires, fuel, batteries) rather than solar-powered ones
A concise, persuasive rebuttal to a common objection against orbital data centers.
Related event: Debate flares over feasibility of space data centers(2 posts)→
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