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A computer simulation says spiral galaxies on a plane bang into each other and result in more elliptical galaxies. Ours hasn’t banged into anyone else yet, that the computer simulation knows about.
6 points
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… So that infamous impending collision with Andromeda will take our spirals away?!
(Impending in a cosmological sense, so several million years at least IIRC)
4 points
Thousands of millions of years I think, and continuing for at least hundreds of millions before the bouncing stops
2 points
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.
