## What is a black hole mathematically?

The Schwarzschild radius is, more or less, the size that a given object, with a given mass, should have in order for it to be a black hole. For instance, if we managed to concentrate all the mass of the Earth into a sphere of a radius of a few centimetres, then that object would be a black hole.

### Who came up with mathematical theory of black holes?

David Finkelstein, in 1958, first published the interpretation of “black hole” as a region of space from which nothing can escape. Black holes were long considered a mathematical curiosity; it was not until the 1960s that theoretical work showed they were a generic prediction of general relativity.

#### What is the formula of black hole?

R S ( M ) = 2 G M c 2 , where G is the gravitational constant and c is the speed of light. It is okay if you do not follow the details of the equation; the basic point is that if you put an amount of mass M or larger in a sphere of radius smaller than RS(M), then voila—it will become a black hole.

**What are some theories about black holes?**

– A new study suggests black holes may just be stars with exotic physics at their cores. – The cores may cause the “dark stars” to radiate dark matter into the universe. – The study may also explain the origin of fast radio bursts.

**Are black holes a fact or a theory?**

The term black hole was given much later. In 1967, American astronomer John Wheeler came up with this term. Black holes were a theory for many years and the first physical black hole was discovered in 1971. By then the properties of a black hole had been discovered.

## What is the principle behind a black hole?

A black hole is a place in space where gravity pulls so much that even light can not get out. The gravity is so strong because matter has been squeezed into a tiny space. This can happen when a star is dying. Because no light can get out, people can’t see black holes. They are invisible.

### How to explain a black hole?

Take a large piece of plastic food wrap (Saran Wrap) and hold it.