Why is the Milky Way a flat spiral instead of a sphere?
In short: Thirteen billion years ago, the Milky Way was a chaotic cloud of gas and dust. This video explains the physics behind how that disordered motion transformed into the organized, rotating spiral structure we observe today, contrasting galactic formation with the spherical shapes of stars and planets.
Thirteen billion years ago, the material that would form the Milky Way moved in every direction. While individual particles behaved chaotically, the entire system possessed a net rotation around a central axis. This rotation is the key to understanding why the galaxy flattened into a disk rather than remaining a sphere.
The video examines the transition from this initial, wild state to the structured spiral galaxy we inhabit. By exploring the mechanics of galactic evolution, it clarifies why the Milky Way adopted its distinct shape, offering a brief look at the forces that shaped our cosmic home.
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Sources
- Summary by Intellect · source: The birth of the galaxy in 60 seconds - Scott Hershberger
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