[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.
These two newly discovered supermassive black holes were found by analysing data from the Hubble Space Telescope and two of the biggest ground-based telescopes in the world, the Gemini North and Keck 2 facilities in Hawaii.