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Black Holes What is a Black Hole 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 An example of gravity I will quote from Black Holes FAQ by Ted Bunn 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 escapes the planets gravity is called escape velocity The escape velocity all depends on the mass of the planet If a planets mass is big its gravity is very strong and the escape velocity is high A planet of smaller mass however would have a smaller gravitational pull and a lower escape ve locity Also the escape velocity also depends on how far you are from the planets center the closer the higher The Earths escape velocity is 25000 MPH and the Moons is 5300 MPH A black hole is an object with such an enormous intensity of mass in such a small area that its escape velocity is greater than the velocity of light Since nothing can go faster than light nothing can escape a black hole If a beam of light were shown on a black hole the gravity would suck it right in and it would never be able to escape A black hole is created when a massive star runs out of fuel at this point it is unable to support itself against its own gravitational pull and it should
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