Our nearest major galaxy, Andromeda, has eaten several smaller galaxies over its lifetime. Now we have reconstructed the story of the meal from the leftover debris
Source:
https://www.newscientist.com/article/2218628-andromeda-galaxy-ate-several-dwarf-galaxies-in-two-course-lunch/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home