10 facts about Galactic Cannibalism please?

i have to do a science project and i need to research galactic cannibalism and i have been to every website and they dont list any information on it. Will ANYONE please give me just 10 facts and please no fake facts. Thank you for even trying to answer this because it is like impossible for me to find anyything about them other than they eat other smaller galaxys. THANK YOU AGAIN!