Scientists think that black holes originated from cocoon-like-stars. Black holes are really tricky, its immense gravitational pull is so strong that nothing can escape it, even light. The only way to find a black hole is when light passes through it. The balck hole appears and the light is distorted. Black holes come in different sizes, there are Supermassive Black Holes which are usually located in the center of a large galaxy, like the Milky Way. That is how our galaxy is rotating. When mass pours into enromous black holes, some of the material is flung into space with high-energy radiation.
