A black hole in the binary star system 4U 1630-47 spins close to the maximum possible rate have been found by thescientists using data from India’s first dedicated astronomy satellite, Astrosat, and NASA’s Chandra X-ray Observatory. The gravity of such a collapsing core is so strong that its entire mass is crushed into a point. However, this point cannot be directly seen, because not even light, can escape from a region around it.Astronomical black holes are the simplest known objects in the universe, because they can be fully characterised by only two properties, mass and spin rate. Therefore, measurements of these two properties are uniquely important to for extreme aspects of the universe and the fundamental physics related to them.The scientific measurement of the spin rate of the black hole, is exotic but the simplest object of the universe, comes out to be close to the maximum possible value.Such measurements can be done only by high-quality X-ray observations in the correct state of the binary stellar system.“The SXT and the Large Area X-ray Proportional Counter (LAXPC) aboard the first dedicated Indian astronomy satellite Astrosat to measure the black hole spin rate, which was consistent with results from contemporaneous Chandra satellite data. They have found that the black hole in 4U 1630-47 spins very rapidly, with a rate not much less than the maximum possible rate.In 2015, Astrosat was launched by the Indian Space Research Organisation (ISRO). It is the first dedicated astronomy satellite of India, and the SXT aboard Astrosat is the first Indian X-ray telescope.India is the first Asian country to build an X-ray Telescope apart from Japan.