Someone tell the left about how hot space is....
(media.kotakuinaction2.win)
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Yeah, the issue for spacecraft generally isn't that they cannot keep warm.
It's that they cannot dump the heat they are already generating.
For instance, look at the picture. Note the huge radiator arrays? Those had to be lifted in to orbit at horrendous cost. That wasn't done by accident - this is not a facility struggling to stay warm, far, far from it.
how would guns work in space? fire couple shots and wait for it to cool down? swappable heat sinks?
I suspect it depends on what the purpose of those weapons is:
Consider, for instance, some kind of high-orbit defence platform with regular resupply. That can afford relatively wasteful practices, although, even there, throwing heatsinks overboard and FOD'ing it's own orbital track seems unwise.
Perhaps they'd settle for a simpler option of using a water heatsink and just spraying the stuff overboard - or the sublimation system the Apollo spacesuits used.
Conversely, some kind of spaceship operating far from support might not want to dump it's water overboard every time it engages targets, so might prefer to maintain a stock of dedicated heatsinks or just run very large radiators to dump the heat without requiring any consumables at all.
Visually its kind of a neat idea, space warships ejecting maxxed out heatsinks like empty mags and swapping in cool ones.