The Orbit of a Sun-Like Star Reveals The Nearest Black Hole Ever Found
In 1916, Karl Schwarzchild theorized the existence of black holes as a resolution to Einstein's field equations for his Theory of General Relativity.
Karl Schwarzchild Kareem El Badry Kavli Institute For Astrophysics Weizmann Institute Of Science Harvard Smithsonian Center Monthly Notices Of The Royal Astronomical Society
Source: sciencealert.com