Last week, astronomers from the European Southern Observatory (ESO) confirmed the astronomical radio source in the middle of our galaxy is a huge black hole.

It is called Sagittarius A * (Sagittarius A-star) and scientists have long suspected that it is a black hole, something that ESO’s observations with its instrument GRAVITY on their telescope VLT (Very Large Telescope) now is able to confirm. It is estimated that Sagittarius A * has a mass corresponding to about 4 million of our own star sun. ESO writes about their observations themselves:

“ESO’s exquisitely sensitive GRAVITY instrument has added further evidence to the long-standing assumption that a supermassive black hole lurks in the centre of the Milky Way. New observations show clumps of gas swirling around at about 30% of the speed of light on a circular orbit just outside a four million solar mass black hole — the first time material has been observed orbiting close to the point of no return, and the most detailed observations yet of material orbiting this close to a black hole.”