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On The Alien Question: Where Are They?

14 Nov 2017, 16:25 UTC
On The Alien Question: Where Are They?
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The great physicist Enrico Fermi asked this question in the 1950s. There are more than 50 possible "solutions" to Fermi's Paradox: Here, astrophysicist Marcelo Gleiser explores a few.(Image credit: Ken Brown/Getty Images)

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