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

[Admin]

The Milky Way's warped shape probably is due to a long-running collision with a smaller galaxy. But which galaxy this might be is a mystery.

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

 

[dfjchem721]

"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.