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Spiral galaxies like the Milky Way are surprisingly rare. Astronomers may finally know why.
(www.livescience.com)
this post was submitted on 26 Nov 2023
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Astronomy
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Actually our galaxy has had at least 1 other collision according to our current understanding.
https://www.wired.com/story/this-galactic-collision-shaped-the-history-of-the-milky-way/
But our spiral likely formed after.