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@-webkit-keyframes r-imtty0{0%{opacity:0;}100%{opacity:1;}} @-webkit-keyframes r-t2lo5v{0%{opacity:1;}100%{opacity:0;}} @keyframes r-11cv4x{0%{transform:rotate(0deg);}100%{transform:rotate(360deg);}} @keyframes r-12fruu6{0%{opacity:0;transform:scale(0.95);}100%{opacity:1;transform:scale(1);}} @keyframes r-1qpf3yi{0%{opacity:0;transform:scale3d(0.92, 0.92, 1);}100%{opacity:1;transform:scale3d(1, 1, 1);}} @keyframes r-7bj9g2{0%{opacity:1;transform:scale3d(1, 1, 1);}100%{opacity:0;transform:scale3d(0.92, 0.92, 1);}} @keyframes r-imtty0{0%{opacity:0;}100%{opacity:1;}} @keyframes r-t2lo5v{0%{opacity:1;}100%{opacity:0;}} .r-o7h1l0{position:absolute;visibility:hidden;top:0;width:50px;pointer-events:none} .r-o7h1l0.loaded{visibility:visible;top:50vh;width:50px} See new posts how will elons space data centers keep cool Thought for 7s Elon Musk has noted: "Space cooling is free.Elon Musk/SpaceX's orbital data centers (AI satellites) will primarily rely on radiative cooling via large deployable liquid radiators, as there's no air or convection in the vacuum of space.pcmag.comWhy Cooling Works Differently in SpaceOn Earth, data centers use air cooling, fans, or water/evaporative systems for convection and conduction. In orbit (vacuum), those don't work. Heat transfer happens almost entirely through thermal radiation (infrared emission, governed by the Stefan-Boltzmann law: power radiated scales with the fourth power of temperature). Space itself is cold (~3K background), but satellites must manage their own waste heat while avoiding solar input. Proven on the ISS (which rejects ~70 kW via radiator panels) and other spacecraft.spectrum.ieee.orgSpaceX's Specific Approach (AI1 Satellite)Recent SpaceX disclosures detail "version 1" AI satellites: Deployable liquid radiator system: ~110 m² (about 1,184 sq ft) per satellite, with redundant pumping loops and micrometeoroid shielding.pcmag.com Internal liquid cooling: Heat from GPUs/chips transfers to a fluid (likely ammonia, like the ISS, rather than water—better freezing/boiling points for vacuum/extreme temps). The fluid circulates to the external radiators, which emit the heat into space.pcmag.comSatellites orient so radiators face away from the Sun/Earth (ideally "knife-edge" to minimize solar heating), with solar panels facing the Sun for power. Size: ~70m wingspan, supporting ~150 kW peak compute (e.g., equivalent to a GB300-like rack with Nvidia GPUs).

and this.. x.com/MickWest/status/206587…