Cover Image: July 2000 Scientific American Magazine See Inside

Where Are They? [Preview]

Maybe we are alone in the galaxy after all

By Ian Crawford















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How common are other civilizations in the universe? This question has fascinated humanity for centuries, and although we still have no definitive answer, a number of recent developments have brought it once again to the fore. Chief among these is the confirmation, after a long wait and several false starts, that planets exist outside our solar system.


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