The birth of the galaxy in 60 seconds - Scott Hershberger

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总结
The Milky Way galaxy's evolution began 13 billion years ago with gas and dust particles colliding and forming angular momentum. This led to a flat structure rather than a spherical one. Spiral arms developed through density waves, influenced by gravitational interactions. Eventually, the Milky Way will merge with Andromeda, reshaping its structure again.
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