Pierre-Simon Laplace lived from 1749 to 1827 and was busy the entire time. He wrote books, worked in politics, and figured out the secrets of the universe. One of those secrets he quietly withdrew from later copies of his books. Pity.
Centuries before black holes became accepted science, a fat little man in 1780s Yorkshire imagined stars so massive that even light could not escape. He predicted black holes. This is the incredible story of John Michell and his "dark stars."