How does the black hole form? Why it is black in colour?
Answers
There are 3 types of black hole and they are formed .....
Primordial black holes are thought to have formed in the early universe, soon after the big bang.
Stellar black holes form when the center of a very massive star collapses in upon itself. This collapse also causes a supernova, or an exploding star, that blasts part of the star into space.
Scientists think supermassive black holes formed at the same time as the galaxy they are in. The size of the supermassive black hole is related to the size and mass of the galaxy it is in.
The Colour of a Black Hole
A black hole is black because it reliably absorbs light of all frequencies. As a result, it also radiates energy as a black body of a specific temperature, that's proportional to the inverse of its mass (or of its radius). A small black hole thus has a high temperature, which means it radiates light at high frequencies; and each photon radiated away has energy proportional to its frequency. However, a black hole of a given mass cannot radiate away a photon with greater energy than the mass of the black hole times the square of the speed of light, since this is all the energy the black hole has.