Black holes

A little bit of history

At the beginning , searchers and especially Newton studied the nature of light; the speed of the light was known and the liberation speed too and the question was: Is it possible for an object to be so massive that his liberation speed is faster than the speed of light ?

1783 John Mitchell exposed his theory

which consists in putting the sun or anover massive object into a small

sphere.

He concluded by saying that If an object comes from very far in the direction of the sphere when it passes the surface of the sphere , its speed will be faster than the speed of light .

1785

The french mathematicien Laplace calculated the very small radius about 6 kilometers such an object would

have if it was as massive as our sun

Most famously black holes where predicted by Einstein’s theory of general relativity , when a massive star dies it leaves behinds a small, dense remnant core

1915

1916

The german astronomer Schwarzchild showed that a massive object squeezed to a single point would warp space around it so much that even the light could’nt escape.

1967

Physicist John Wheeler used the term « black hole » to describe them in a public lecture, a name that has stuck ever since .

1994 Hubble Space Telescope

Today definition

A black hole is a massive star in the last phase of his evolution, in which the star collapses creating a volume of space-time with a gravitational field.

The black hole is so dense that it creates a pit deep enough to prevent light from escaping.

Black holes in movies

Websites:

https://www.nasa.govhttps://www.sciencenews.orghttps://en.wikipedia.org/wiki/https://www.aps.org/publications/apsnews/201412/thorne.cfmhttp://zidbits.com

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