Block hole
Black hole
This above image of black hole will be post resently on NASA
Twitter
https://twitter.com/NASA/status/1177417427405148160?s=20
The concept of a black hole is one of the most interesting and startling products modern gravitational theory
In 1783 the Rev.John Mitchell, amateur astronomer , noted that if a body with same average density as the sun had about 500 times the radius of the sun , magnitude of its escape velocity would be greater than the speed of light C . With his statement that "alllight emitted from such body would like be made to return toward it" Michell became the first person to suggest the existence of what we now call it a Black hole
This above image of black hole will be post resently on NASA
https://twitter.com/NASA/status/1177417427405148160?s=20
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