Like fossil fuels come from organic matter that grew because of the sun. Is there any form of energy on that cannot be traced back to the sun in some way?
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It’d be interesting to think of novel ways of getting power from sources other than the Sun.
Theoretically, one could, say, build a space-elevator-like device and use the centrifugal force pushing it away from Earth to run a generator. Of course, for that to work, the weight would have to continually receed from Earth, and may require continually replacing the weight. Ultimately that would rob the Earth of angular momentum.
