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Questions tagged [thermodynamics]

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13
votes
3answers
1k views

Black holes as heat sinks

Cooling in space is a well known difficulty. There are many unpleasant consequences like no stealth in space, difficult space battles which turn into a short wars of attrition (because you have to ...
7
votes
2answers
136 views

How small can a perpetual energy source be to run a far-future civilization indefinitely?

You are the leader of a far-future civilization - human or otherwise - that has endured for trillions of years doing whatever far-future civilizations do. You've surrounded stars with Matrioshka ...
8
votes
3answers
182 views

How to calculate the thickness of the ice-layer of a frozen ocean planet/moon?

How do I calculate the thickness of the upper ice layer on cold ocean worlds like Europa, Enceladus, Ganymede, ...? I'm asking this for a programm I'm currently writing. Given/Known is: mass, radius, ...
5
votes
5answers
292 views

What is the best way to vent gas to cool a star cruiser?

Generating physical effects with energy generates waste heat. Using a lot of energy, say, by firing a rail gun or a MW laser, generates a lot of heat. A discussion of waste heat issues can be found at ...