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Black Hole

Has 2 entities.

Sucks everything into it
It's mass is just about 1.989 * 10^14 kg. But it's radius is very big for a black hole of that mass.
Don't come close to it. At least without a noclip or something holding you back.

Pushes everything out of it.
Theoretical entity that spits out matter out of unknown realities.

DO NOT COLLIDE BLACK HOLE AND WHITE HOLE TOGETHER!

There is an additional hidden "prop_black_hole_grow" entity. It is, well, a growing black hole. You can spawn it, but beware - it's really broken on clientside and do NOT report any problems to me that you've experienced with it!