A Black Hole is an object so dense that beyond its event horizon, escape velocity is greater than the speed of [[Light|light]].

The stellar-mass ones form when very massive stars collapse after a [[Supernova]]. At the centers of galaxies, you also get supermassive black holes.

They are not cosmic vacuum cleaners, but if something gets too close, gravity takes over hard.

## See also
- [[Star]]
- [[Supernova]]
- [[Galaxy]]
- [[Cosmos]]