A galactic crash could be behind Milky Way's warped appearance

"One possible candidate is the dwarf galaxy Sagittarius, which scientists say likely did move through the Milky Way disc a few times in the past. "

How would they know this? Perhaps a star, gas and dust trail connects the dwarf galaxy Sagittarius to the Milky Way. And this happened twice. Again, how could they know this? Sounds like deja vu all over again.


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