'Trainwreck' galaxy reflects the aftermath of a violent galactic collision (image) 

 The "peculiar," twisted galactic disk of the "trainwreck" lenticular galaxy NGC 4753 offers evidence of its violent collision with a dwarf galaxy over 1 billion years ago. 

https://cdn.mos.cms.futurecdn.net/N3fMF3dcEAVU4qUjtDZzMh.png

https://www.space.com/twisted-trainwreck-galaxy-violent-galactic-collision