#universe
4 article(s)
How Big Is the Universe, Really?
The numbers are so large they stop meaning anything. So let's build up to them one impossible step at a time.
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The Fermi Paradox: If the Universe Is So Big, Where Is Everybody?
Billions of stars, billions of years, and yet total silence. One simple lunchtime question still haunts science today.
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Dark Matter: The Invisible Stuff Holding the Universe Together
Most of the universe is made of something we cannot see, cannot touch, and cannot explain. And without it, galaxies would fly apart.
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Why Is the Night Sky Dark? The Puzzle Called Olbers' Paradox
It sounds like a silly question with an obvious answer. It isn't — and taking it seriously helped reveal the nature of the entire universe.
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