aug 31, 1783 - British astronomer John Michell
Description:
proposes the theoretical idea of an object massive enough that its gravity would prevent even light from escaping (which has since become known as a black hole). He realizes that such an object would not be directly visible, but could be identified by the motions of a companion star if it was part of a binary system. A similar idea was independently proposed by the Frenchman Pierre-Simon Laplace in 1795.Added to timeline:
Date:
aug 31, 1783
Now
~ 241 years ago