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> in situations where the shrouds of two colliding galaxies separate from the galaxies themselves

TIL...

That’s the first time I’ve read that. Sounds interesting, have you got any links?

Sounds like he's talking about the bullet cluster...

Although that's a colliding pair of galaxy clusters. I'm not currently aware of any examples of this effect being observed for just two galaxies.

Awesome, thanks for the link!