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University Degree: Astronomy
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The first ideas were put forward in 1783 by Reverend John Michell where he talked of how "light could not escape from a star of the same mean density as the Sun but 500 times bigger". These first ideas on Black Holes were based around speculations about Black Holes hinged on ideas about the nature of light. By the end of the 17th century it was known that light travelled through space at a great speed. Then in 1965 Ole Romer made one of the first estimates at the speed of light after studying the path of one of Jupiter's moons.
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Astronomers also suspect that other galaxies may harbour extremely massive black holes at their centres. These are thought to weigh about a million times as much as the Sun, or 1x1036 kilograms. The more massive a black hole is the more space it takes up. In fact, the if one black hole weighs ten times as much as another, its radius is ten times as large. A black hole with a mass equal to that of the Sun would have a radius of 3 kilometres.
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