Black Holes : Origin of Black Hole as a Term

Black holes were known way before Einstein gave the general theory of relativity but were known by a different name "Dark Star". After Sir Isaac Newton gave the universal law of gravitation in 1687. In 1783, a geologist named John Michel theorized that "what if there exists a star so massive that the escape velocity of that star is more than or equal to the speed of light". but at that time it was unknown that whether gravitational force affected the speed of light in any case in Newtonian mechanics, but later said that if we fire a beam of light from the surface of a massive star then theoretically light would never escape the surface of the star, showing it as a dark star, it was the origin of the word dark star. In 1905, Albert Einstein gave the general theory of relativity, it was a set of equations, but when solved they found a particular solution to equations, where all the matter would collapse into a single point of infinite density, the gravitational pull would be so huge that even light could not escape it, time would dilate at very high rates. These gave rise to the term black hole, it was coined by John Wheeler in 1983, after the death of Albert Einstein.