re: Astronomers may have found giant alien 'megastructures' orbiting star

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because we know so much about alien civilizations

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We don't know what they'd look like, but we do know if they have become a space fairing race what they use for energy. Its entire planets and stars. They have the most amount of matter and energy that can be exploited. So we look for stars and planets that seem to be oddly disprortionate in these levels of energy and hopefully find some struture they are using to siphon stars and planets.