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aatventure
Physicist Enrico Fermi asked that question over lunch in 1950. Seventy-five years later, science still has no answer.
The galaxy is 13.6 billion years old. It contains 400 billion stars. Billions of planets sit in habitable zones. A single civilization could have colonized every star system millions of years ago.
So where are they?
Why, after sixty-five years of searching, have we found absolutely nothing?