Timeline of Discoveries, Observations, and Findings

1687 — Sir Isaac Newton described gravity in "Principia."
1783 — John Michell speculated that there might be an object so massive even the speed of light cannot break free from its gravitational field. 
1915 Albert Einstein predicted spacetime curvature in the Theory of General Relativity. 
1967 — the term "black hole" is coined by John Wheeler.
1970 — Stephen Hawking defined the modern theory of black holes, which describes the final fate of black holes through Hawking Radiation.

1970 The first good black hole candidate, Cygnus X – 1 (about 6000 light years away from us), was found during a rocket flight.
2002 — 'Max Planck Institute for Extraterrestrial Physics' astronomers give evidence for the possibility that Sagittarius A is a supermassive black hole at the center of the Milky Way galaxy.
2004 — A team from UCLA presents even stronger evidence supporting that Sagittarius A is a black hole. 
Sagittarius A*

2010 — A very likely candidate for a black hole was discovered in the M-100 galaxy, about 50 million light-years from Earth. It is the youngest black hole scientists have found - only 32 years old with its birth date in April 1979.

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