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> How do you power a moon base with solar? 14 days of battery?

Either that or a place near one of the poles where you get water and lots of sunshine. A small fission reactor is a handy thing to have, however.

> Fine. How do you power a Europa base with Solar?

A lot more solar panels, or wire loops harnessing Jupiter's magnetic field and Europa's momentum, etc. Fission is still cool for that.

> A Neptune probe?

Now we enter the nuclear fission territory. Maybe fusion, some day.



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