The black hole exists in the binary star system 4U 1630-47 and obviously cannot be directly seen, because nothing, not even light, can escape from a region around it, thus justifying the name of the object. In this context, Business Insider quoted Rodrigo Nemmen, one of the lead authors of the research, as saying that Einstein's theory of relativity "further implies that if a black hole is spinning that fast, then it is capable of making space itself rotate." Even if you're not taking spin rates into account, this black hole is one of only 20 others that have been spotted in the Milky Way galaxy. The black hole was first tracked in the binary stellar system 4U 1630−47 in 2016 by the Indian Space Research Organization (ISRO)'s AstroSat, in coordination with the National Aeronautics and Space Administration (NASA)'s Chandra X-ray Observatory. Mass and spin classify a black hole

Relatively smaller black holes are exotic end states of massive stellar cores, said astronomers led by the Tata Institute of Fundamental Research (TIFR) in Mumbai.
NASA's Chandra X-ray Observatory confirms earlier observations by Indian Space Research Organisation's Astrosat space observatory of a rotating black hole in the binary star system 4U1630-47, which is spinning close to the speed of light, one of the fastest ever observed.