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Very interesting idea. Of course, an assumption you're implicitly making is that the energy required to build, set up, and maintain whatever technology you're using to capture all a star's energy is small enough relative to the star's energy that it's worth it to do so. This doesn't seem like that unbelievable of an assumption, but I'm not sure if it's clear cut.

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Yes, there are several assumptions hiding under this idea. This one, I think, is probably pretty tame -- the Dyson sphere idea has already been out there for a long time (and it found its way to an episode of Star Trek, so it must be true [img]/images/graemlins/wink.gif[/img] ).