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Black hole
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What are black holes? Who first invented or discover them..? Let’s the adventure begins and find the answer to all these questions. As you all are my intelligent readers you must know the difference between discovery and inventions but if you don’t know I am here to help you, discovery means find out the things which already exist in nature & invention means to create a thing or you may be called as product or let’s say a gadget which does not exist in nature exactly what engineers did nowadays.
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john wheeler |
The term black hole is of very recent origin. It was coined in 1969 by the American scientist john wheeler as a graphic description of an idea that goes back at least two hundred years. At that time there were two theories about the light that you must be familiar with it. One assumed that light is a particle and other assumes that it is made up of waves.
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| don't take it seriously |
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| the speed of light...... |
But now we know that both the theories are correct. By the wave/particle duality of quantum physics, light can be regarded as both a wave and a particle. Under the theory that light was a particle, one might expect them to be affected by gravity in the same way that cannon balls, rockets & planets are.
On this assumption, a Cambridge don, John Michell, wrote a paper in 1783 in the philosophical transactions of the royal society of London. In it, he pointed out that a star that was sufficiently massive and compact would have such a strong gravitational field that light could not escape. Any light emitted from the surface of the star would be dragged back by the star’s gravitational attraction before it could get very far. Michell suggested that there might be a large number of stars like this. Although we would not be able to see them because the light from them would not be able to reach us, we would still feel there gravitational attraction. Such objects are what we now call black holes because that is what they are black voids in space.
According to the theory of relativity, nothing can travel faster than light. Thus, if light cannot escape, neither can anything else. Everything is dragged back by the gravitational field. So one has a set of events, a region of space-time, from which it is not possible to escape to reach a distant observer. This region we what we now call a black hole. Its boundary is called the event horizon. It coincides with the paths of the light rays that just fail to escape from the black hole.
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| labeled description of a black hole in the depth |
