1...it is a great amount of matter packed into a very small area - think of a star ten times more massive than the earth squeezed into football,then it behave as black hole
2....powerful explosions can result when a black hole and a neutron star collide, producing another black hole
3....They produce high intensity gamma ray bursts and X-rays.
4....It has very high gravitational force
5....an object in space so massive and dense that light could not escape.
6.... Einstein's theory of general relativity, which showed that when a massive star dies, it leaves behind a small, dense remnant core. If the core's mass is more than about three times the mass of the Sun, the equations showed, the force of gravity overwhelms all other forces and produces a black hole.
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