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John Michell assumed that an object that was compact enough would not be able to emit light; his calculations were based on the escape velocity. At his time (18th. century) the idea was considered preposterous.
Soon after the publication of the General Theory of Relativity, Schwarzschild (by coincidence, the name means "black shield") did calculations that predicted the possibility of the black hole. Note that the explanation of why the black hole would not emit any light is somewhat different than the ones by Michell. Michell's calculations were based on the escape velocity of an object; the modern version of the black hole is about space-time being so distorted that an object can only get deeper into a black hole, no matter what its velocity.
According to calculations by Stephen Hawkings, a black hole would gradually evaporate, despite the fact that matter can't directly get out from the inside of the black hole. His calculations are based on quantum-mechanical effects near the border (event horizon) of the black hole.
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RafaThe philosopher and geologist John Michell in the late 18th century described what would happen to infalling matter approaching a body of a certain mass where it had sufficient acceleration from gravity to approach the speed of light, and proposing the idea that light theoretically emitted by it would be unable to escape; but it wasn't until Albert Einstein's General theory of Relativity (1915) that the framework of gravitation was in place and the reality of black holes could be described mathematically. Building upon Einstein's work, the effect of gravity on light was much better understood and solutions to his field equations yielded much more accurate models of black holes' properties and strong theoretical evidence for their existence. Karl Schwarzchild was the first to find a solution describing an uncharged, non-rotating black hole and the formula for the radius of a black hole of a given mass takes his name (the Schwarzchild radius).
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Who didn't have experimental evidence to support his theory of atoms?
The Greek philosopher Democritus first put forward the idea of atoms as an intellectual theory.
Who proposed john Dalton's atomic theory?
John Dalton. He put forward the atomic theory in 1808.
What does Henry cavendish have to do with black holes?
Henry Cavendish did not have direct involvement with black holes. He was a British scientist known for his work in chemistry and physics, particularly for his discovery of hydrogen. The study of black holes came much later, with significant contributions from scientists like Stephen Hawking.
What is the Meaning of natrul selection?
It is the most consistent, and perhaps the best, theory put forward to explain the fact of evolution.
What is a white hole in space?
A white hole is a hypothetical region of spacetime where matter and light can only escape from, rather than being drawn into it like a black hole. In theory, white holes would be the reverse of black holes, but there is no observational evidence supporting their existence.
