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#154 – Avi Loeb: Aliens, Black Holes, and the Mystery of the Oumuamua
Lex Fridman Podcast
Why Do We Know That Black Hole Exist?
In 2015, exactly 100 years after Einstein came up with his theory of gravity, the LIGO Observatory detected gravitational waves. These are ripples in space and time that propagate out at the speed of light. And if you have a sensitive enough detector like Ligo, you can detect these waves. So we have evidence now that when the universe was about 7% of its present age, infant, already back then you had black holes of a billion times the mass of the sun. It's like finding giant babies in a nursery.
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