Essay on black hole in 150-200 words in easy language
Answers
A black hole is a region of space from which nothing, including the general theory of relativity, it is the result of the curving of spacetime caused by a huge mass. Around a black hole there is a position of no return, called the event horizon. It is called "black" because it absorbs all the light that hits it, reflecting nothing, just like a perfect black body in thermodynamics.
Under the theory of quantum mechanics black holes have a temperature and emit Hawking radiation, which makes them slowly get smaller.
A black hole is found by its interaction with matter. The presence of a black hole can be inferred by tracking the movement of a group of stars that orbit a region in space. Alternatively, when gas falls into a black hole caused by a companion star or nebula, the gas spirals inward, heating to very high temperatures and emitting large amounts of radiation. This radiation can be detected from earthbound and Earth-orbiting telescopes.
Astronomers have also found evidence of supermassive black holes at the center of almost all galaxies. After observing the motion of nearby stars for 16 years, in 2008 astronomers found compelling evidence that a supermassive black hole of more than 4 million solar masses is near the Sagittarius A* region in the center of the Milky Way galaxy.
Some scientists thought Michell might be right, but others thought that light had no mass and would not be pulled by gravity. His theory was forgotten.
In 1916 Albert Einstein wrote an explanation of gravity called general relativity.
1. Mass causes space (and spacetime) to bend, or curve. Moving things "fall along" or follow the curves in space. This is what we call gravity.
2. Light always travels at the same speed, and is affected by gravity. If it seems to change speed, it is really traveling along a curve in spacetime.
Gravitational collapse
The gravitational collapse of huge (high-mass) stars cause "stellar mass" black holes. Star formation in the early universe may have resulted in very massive stars, which on collapse would produce black holes of up to 103 solar masses. These black holes may be the seeds of the supermassive black holes found in the centers of most galaxies.
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