The most mystifying black holes in the universe

Black holes are gigantic cosmic monsters, exotic objects whose gravity is so strong that not even light can escape their clutches.
Black holes come in a wide variety of forms, from small stellar-mass bodies to the supermassive beasts that reside at the hearts of galaxies. Here are 10 of the most extreme black holes, from the smallest to the largest and from cannibals to rogues.
The most mystifying black holes in the universe