How Did the Universe Begin? | AMNH (2024)

How Did the Universe Begin? | AMNH (1)

Since the Big Bang, theuniversehas been expanding. In the early years, everything was made of gas. This gas, mostly hydrogen and helium, expanded and cooled. Over billions of years, gravity caused gas and dust to form galaxies, stars, planets, and more.

The matter that spread out from the Big Bang developed into everything in theuniverse, including you. You are made of star stuff!

How Did the Universe Begin? | AMNH (2024)
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