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1: Yes. I'm not sure exactly how the process works, but I know they don't power the X-rays in hospitals with cheese, if you get my drift. Though that would be really cool.
2: Probably, but I'm not sure how efficiently it can be done, and seeing as the atmosphere blocks most things above ultraviolet, you couldn't get enough to make it worthwhile on the surface. I couldn't say what it'd be worth in space. There's also conservation of energy. Even at perfect efficiency you can;t get more out than you put in, so you'd end up with more compact transfers but fewer of them.
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