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A black hole is a region of space whose attractive gravitational force is so intense that no matter, light, or communication of any kind can escape. A black hole would thus appear black from the outside. (However, gas around a black hole can be very bright.) It is believed that black holes form from the collapse of stars. As long as they are emitting heat and light into space, stars are able to support themselves against their own inward gravity with the outward pressure generated by heat from nuclear reactions in their deep interiors.

A swirling gas disk around a probable black hole in M87 Galaxy ||

Say Einstein, and most of us think a) cheeky oldster with wild white hair, sticking out his tongue and b) either E = mc2, or the theory of relativity. Possibly both. What was their importance? They were revolutionary. (Aida **Edemariam)**