Foone🏳️⚧️@mcc @xgranade @dysfun Ganymede!
Max surface temperature of −121 C, and it's the only moon with a significant magnetosphere.
(it might be too close to Jupiter though, and is getting clobbered by Jupiter's magnetosphere, making it worse than open space. It is tidally locked though, so maybe you can find a spot that's not getting hit?)
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