[noncount] : a quality that makes you continue trying to do or achieve something that is difficult. 1  What he lacked in talent he made up for in determination. 2  dogged/fierce/steely/stubborn determination.
The first modern solution of general relativity that would characterize a black hole was found by Karl Schwarzschild in 1916, although its interpretation as a region of space from which nothing can escape was first published by David Finkelstein in 1958.
Since then however, some of Schwarzschild's theories have been disproved, but most of his initial theories hold intact today. In truth, English geologist John Michell was the first to suggest the existence of black holes. He referred to them dark stars and based his calculations on Newton's Laws of gravity.