Hard to find Chuck Howley Cowboys Jersey , hard to explain, hard to understand and hard to imagine they defy the known laws of physics at their centre and provide mind boggling results at their edges. A black hole is impossible to see but there has been enough evidence to certify their existence. They are an important part of the solar life cycle and perhaps an even more important factor in galaxy formation. In 1785 a man named Peirre Simon Laplace concluded that if enough mass were packed into a sufficiently small space that the gravity would be so intense that not even light would be able to escape. The idea is based on escape velocities being proportional to the mass of an object. For example, the energy needed to escape the gravitational pull of Earth is 19 Alfred Morris Cowboys Jersey ,700 mph greater than what is needed to break free of the Moon. Laplace theorised that when gravity reaches a massively high value that the escape velocity would be faster than the speed of light, trapping light particles and rendering the object invisible. During the early 20th century physicists such as Oppenheimer, Volkoff Cedric Thornton Cowboys Jersey , Snyder and notably Karl Schwarzschild would refine the theory and provide mathematical formulae to back it up. The only known way for a black hole to form is from the death of a massive star, this is the only way that such a huge mass can be packed into such a small volume. During the main phase of their life stars are trying to explode through nuclear fusion but at the same time are held together by their own gravity. These two forces balance the volume of the star and will define its size. When the star runs out of fuel for nuclear fusion then there is no outward force and so gravity causes it collapse in on itself. The collapse heats up the core to a massive degree and will cause a supernova explosion. After the supernova all that is left of the star is a highly compressed core, continually collapsing under its own gravity. The gravity becomes so strong that light cannot escape and so a black hole is formed. Black holes effect spacetime in strangely different ways to other bodies. They cannot be seen by visiblelight Chaz Green Cowboys Jersey , but have a number of interesting properties
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