Olber’s paradox: Why is the night sky dark? If the universe is infinite, and we are in a typical part of it, then every line of sight from your eye into the sky will end on the surface of a star. In this case, the night sky should be a bright as the surface of the sun.
The original thought was that this meant the universe is **either** not infinite, **or** we live in a very atypical part of it – the only part with stars.
[The actual answer was more amazing than either of those two answers.](https://youtu.be/BG8OP76hUdc)
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