Sagittarius A
There is a supermassive black hole at the centre of the galaxy. Sagittarius A* (abbreviated Sgr A*) is the most likely candidate for the position of this central black hole. The Very Large Telescope and Keck Telescope detected stars orbiting Sgr A* at speeds greater than any other stars in the galaxy. One star, S2, orbits Sgr A* at speeds of over 5,000 kilometers per second at its closest approach.