New evidence shows crash with Antlia 2 gave the Milky Way the ripples in its outer disc

The newly-discovered dark dwarf galaxy Antlia 2’s collision with the Milky Way may be responsible for our galaxy’s characteristic ripples in its outer disc, according to a study led by Rochester Institute of Technology Assistant Professor Sukanya Chakrabarti.

Source:
https://phys.org/news/2019-06-evidence-antlia-gave-milky-ripples.html