In 1950, physicist Enrico Fermi asked one question over lunch — and over 75 years later, nobody has an answer. In this video you learn: why the Milky Way's ~200 billion stars and tens of billions of potentially habitable planets should mean the galaxy is full of civilizations; how stars billions of years older than our Sun would give aliens a billions-of-years head start; and why 60+ years of SETI listening has found no confirmed signal or visit — the contradiction called the Fermi Paradox.
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