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Black holes are objects so dense that not even light can escape their gravity and since nothing can travel faster than light nothing can escape from inside a black hole Loosely speaking a black hole is a region of space that has so much mass concentrated in it that there is no way for a nearby object to escape its gravitational pull Since our best theory of gravity at the moment is Einsteins general theory of relativity we have to delve into some results of this theory to understand black holes in detail by thinking about gravity under fairly simple circumstances Suppose that you are standing on the surface of a planet You throw a rock straight up into the air Assuming you dont throw it too hard it will rise for a while but eventually the acceleration due to the planets gravity will make it start to fall down again If you threw the rock hard enough though you could make it escape the planets gravity entirely It would keep on rising forever The speed with which you need to throw the rock in order that it just barely escapes the planets gravity is called the escape velocity As you would expect the escape velocity depends on the mass of the planet if the planet is extremely massive then its gravity is very strong and the escape velocity is high A lighter planet would have a smaller escape velocity The escape velocity also depends on how far you are from the planets center the closer you are the higher the escape velocity The Earths escape velocity is 112 kilometers per second about 25000 MPH while the Moons is only 24 kilometers per second about 5300 MPHWe cannot see it but radiation is emitted by any matter that gets swallowed by black hole in the form of X-rays Matter usually orbits a black hole before being swallowed The matter spins very fast and
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