Scientists at the US National Aeronautics and Space Administration (NASA) have found a new class of black holes with a mass of about 10,000 Suns, Xinhua reports. The black holes will now be categorised as intermediate-mass - between stellar black holes that are about 10 times as massive as the Sun and supermassive black holes with masses a billion times that of the Sun. These intermediate-mass black holes are an important finding because they help bridge the gap between stellar-mass black holes and supermassive black holes in the centres of galaxies, according to Jifeng Liu, who has written a paper on the discovery.