The universe is swarming with aliens

Incredible scientific deduction, and an absolutely exciting thought. 

We know the number of stars born each year. We know that the percentage of stars hosting planets is about 100. And we also know that about 20 to 25 percent of those planets are in the right place for life to form. This puts us in a position, for the first time, to say something definitive about extraterrestrial civilizations — if we ask the right question.

 New York Times

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