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Rogelio V. Solis / AP Looking for Solar Panels on Distant Planets
If alien civilizations exist, could we spot their industrial footprints in space?
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NASA / Ames / JPL-Caltech How Do Aliens Solve Climate Change?
Scientists recently modeled a range of interactions between energy-intensive civilizations and their planets. The results were sobering.
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Regis Duvignau / Reuters Was There a Civilization on Earth Before Humans?
A look at the available evidence
