Black holes do not emit any detectable radiation, meaning researchers are required to look for the effects they have on their nearby environment.
A team led by astrophysicist Shunya Takekawa of the National Astronomical Observatory of Japan have been studying the motion of the high-velocity clouds of gas in the centre of the Milky Way to learn more about this class of black hole.
Previously, they used the gas-tracking method to identify an intermediate mass black hole candidate clocking in at around 32,000 solar masses, which would produce an event horizon – the spherical region of space around a black hole past which light cannot escape – approximately the size of Jupiter.
source: express.co.uk