What are black holes ? definition | types | Dangerous?

Black holes are some of the outer space's strangest and most fascinating objects. A black hole is a site in space where gravity pulls so much that even light can't escape. The gravity is so intense because it has compressed matter into a small vacuum. That can occur when a star dies. Since there can be no light coming out, humans can not see black holes. They are invisible to all. Space telescopes can help locate the black holes via special instruments. The special instruments will see how stars in close proximity to black holes behave differently from all other stars.

History

Albert Einstein first foretold the existence of black holes with his general theory of relativity in 1916. A German physicist and astronomer identified Karl Schwarzschild suggested the modern concept of a black hole in 1915 after discovering an accurate solution to Einstein's general relativity approximations. The first-ever observed black physical hole was found in 1971. Then, in 2019 the collaboration of the Event Horizon Telescope (EHT) released the first-ever recorded image of a black hole.

What do black holes look like? 

We know from now on that black holes are mysterious areas where gravity is intense enough to bend light, warp space, and manipulate time. Scientists are unable to see black holes because they see stars and other objects in space. Alternatively, astronomers must focus on detecting black holes produced by the radiation as dust and gas are drawn into the massive creatures. But supermassive black holes, lying in the central core of a galaxy, may become enveloped by the thick dust and gas around them, which can block the telltale emissions. The interior region of a black hole, where the mass of the object lies, is known as its singularity, the one point in space-time where the mass of the black hole is concentrated.

How do black holes form?

Scientists think that when the universe started, the smallest black holes developed. Other than that it is widely agreed that stars with a mass at least three times greater than that of our Sun that experience extreme gravitational collapse until their fuel is exhausted. The combined force of gravity, with so much mass in a small space, overcomes the law that normally prevents the building blocks of atoms from occupying the same location. All this density produces a black hole. Stellar black holes are created when a very large star's core falls or collapses on itself. If this occurs it gives rise to a supernova. A supernova is an exploded explosion that throws a part of the explosion into space. Galactic black holes are created when a very large star's core falls or collapses on itself. If this occurs it gives rise to a supernova. A supernova is a star that explodes and blasts half of the star into space.

Types of Black Holes

Three types of black holes have so far been established by astronomers: stellar black holes, supermassive black holes and intermediate black holes.

1.Stellar black holes 

A stellar, black hole (or black hole of stellar mass) is a black hole created by a star's gravitational collapse. We have solar masses varying from around five too many hundreds. The cycle is detected as an explosion in hypernova or as a blast of gamma rays. Those black holes are also called collapsars.

2.Supermassive black holes 

A supermassive black hole (SMBH or sometimes SBH) is the largest type of black hole which contains a mass of hundreds and thousands to billions of times the mass of the Sun. Like binary black holes with mass, one does not encounter substantial tidal force until very far within the black hole. These black holes are believed to exist in the middle of nearly every galaxy, along with the Milky Way.

3.Intermediate black holes

An intermediate-mass black hole (IMBH) is a class of black hole with its mass varying in the range 102-105 of solar mass which is slightly greater than stellar black holes but less than the supermassive black holes with approximately 105-109 solar mass. All of these IMBHs that formed in the same area could ultimately collapse together in a galaxy's centre and generate a supermassive black hole.

Could a Black Hole Destroy Earth?

Black holes do not eat stars, moons and planets in space. The planet does not collapse through a black hole because there is no black hole near enough for Planet to do so to the solar system. 

And if a black hole were ever to take the place of the sun by the same mass as the sun, Earth would still not fall in. The black hole would be equally gravitational as the sun. Earth and the other planets will orbit the black hole while now circling the sun. 

The sun never gets turned into a black hole. The sun is not a star massive enough to create a black hole.

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