Black Hole

Maximally gravitationally collapsed object predicted to exist by the theory of general relativity, from which no material object, light or signal of any kind can escape. Many black holes form when a high mass supergiant star explodes in a supernova explosion at the end of its life. A star probably must have a mass of >40 Msun to leave a ~3 Msun black hole. Black holes are detected by the effects they have on neighboring stars. The centers of most galaxies, including our own, contain super-massive black holes which have sucked in thousands of stars.

Some or all content above used with permission from J. H. Wittke.