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What happens when galaxies collide? A billion year gravitational waltz.
This computer simulation includes images from Hubble of actual galactic collisions at different stages.
Credit: NASA, ESA, and F. Summers
Source: https://svs.gsfc.nasa.gov/cgi-bin/details.cgi?aid=30686
There’s one on Lemmy.ml https://lemmy.ml/c/damnthatsinteresting It’s small at the moment.