Blackholes

What are black holes? A black hole is a region of spacetime where gravity is so strong that nothing- no particle can escape from it. Stellar black holes are made when the center of a very huge star falls in upon itself. When this happens, it causes a supernova. A supernova is an exploding star that blasts part of the star into space.

 Black holes have a finite lifetime due to the emission of Hawking radiation. Hawking radiation is electromagnetic radiation that is said to be emitted by a black hole. It is also black body radiation. A black body is a theoretical or model body that absorbs all the radiation falling on it, reflecting or transmitting none. 

The term black hole was coined in 1967 by John Wheeler. In April 2017, using 8 telescopes around the world in a collaboration known as the Event Horizon Telescope. It was said that it is a luminous gas swirling around the black hole which was in the center of M87. M87 is a galaxy 54 million light-years away. Their weight is about 10 solar masses- a standard unit of mass in astronomy.

 You don't return because the tidal force would kill you. Black holes have a theorem known as Singularity. Singularity crushes all the matter in the black hole. Singularity simply is a location in the spacetime where the gravitational field of the celestial body is predicted to become infinite by the term general relativity. General relativity is just the geometric theory of gravitation. This theory was discovered by great scientist Albert Einstein. 

The time a black hole would take to completely disappear and evaporate is much far than the current age of the universe.

----------------------------THANK YOU-----------------------------------------