Scientists discover cosmic fossil created by erupting supermassive black hole 

 Giant clouds of cold gas in NGC 4945, were blasted through the spiral galaxy when its central black hole erupted 5 million years ago.  

https://cdn.mos.cms.futurecdn.net/5SA6p844uALvFWsac6g5SE.png

https://www.space.com/cosmic-fossil-created-by-erupting-supermassive-black-hole