Black hole timeline By handerson2011 Jul 15, 1950 Paul Dirac, First suggestion of string theory Sep 15, 1950 Einstein's failed unified thoery Jul 15, 1955 Cesium Atomic clock Jul 15, 1957 Feynman, Gell-Mann, Marshak, Sudarshan, V-A theory of weak interactions Jul 15, 1961 Edward Lorenz, chaos theory Jul 15, 1964 Roger Penrose, black holes must contain singularities Jul 15, 1964 Roger Penrose proves that an imploding star will necessarily produce a singularity once it has formed an event horizon Jul 15, 1970 Stephen Hawking, the surface area of a black holes event horizon always increases Jul 15, 1972 Stephen Hawking proves that the area of a classical black hole's event horizon cannot decrease Jul 15, 1994 Hubble Space Telescope, Evidence for black hole at the centre of galaxy M87 Jul 15, 2002 NASA's Chandra X-ray Observatory identifies double galactic black holes system in merging galaxies NGC 6240 Jul 15, 2004 Further observations by a team from UCLA present even stronger evidence supporting Sagittarius A* as a black hole.
