Black hole
In 1930, Subrahmanyan Chandrasekhar predicted that stars heavier than the sun could collapse when they ran out of hydrogen or other nuclear fuels to burn.Penrose, Roger 1996. Chandrasekhar, black holes and singularities. Journal of Astrophysics and Astronomy. 17 (3–4): 213–231. Bibcode:1996JApA...17..213P. CiteSeerX 10.1.1.496.2529. doi:10.1007/BF02702305. S2CID 119807977. Archived from the original (PDF) on 23 July 2018. Retrieved 4 September 2017. In 1939, Robert Oppenheimer and H. Snyder calculated that a star would have to be at least three times as massive as the Sun to form a black hole. In 1967, John Wheeler invented the name "black hole" for the first time. Before that, they were called "dark stars".