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Q&A Detecting an Alien Civilization on a Nearby Planet

This question is inspired by NASA's recent TRAPPIST-1 announcement. Imagine two planets orbiting a star with orbits very close together. At the nearest point in their respective orbits they are onl...

4 answers  ·  posted 8y ago by Mike Nichols‭  ·  last activity 8y ago by Mike Nichols‭

Question astronomy civilization