Hubble determines the mass of an isolated black hole speeding around the Milky Way Galaxy

Illustration Credit: FECYT, IAC Astronomers believe there could be as many as 100 million black holes among the stars in the Milky Way galaxy alone. Despite the many theorized black holes, it's been a struggle for scientists to identify an isolated black hole. Finally, after six years of 'meticulous observations,' NASA's Hubble Space Telescope has 'provided direct evidence for a lone black hole drifting through interstellar space by a precise mass measurement of the phantom object.' This is a ma...