TIL there's a "Black Hole Bullet" some 20 million times the mass of our sun traveling 1000 kilometers a second only visible because it's leaving a thin line 200,000 light years long of new stars in its wake.

https://www.universetoday.com/articles/physicists-determine-cause-of-runaway-supermassive-black-hole
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1xog4ze/til_theres_a_black_hole_bullet_some_20_million/