A newly discovered star takes only four years to travel around the black hole at the centre of our galaxy. In the vicinity of the black hole at the centre of our galaxy is a densely packed cluster of stars. This cluster, called the S cluster, is home to well over a hundred stars that differ in their brightness and mass. S stars move particularly fast. However, in brief moments we can observe the surroundings of the central black hole.' By means of continuously refining methods of analysis, together with observations covering almost twenty years, the scientist now identified without a doubt a star that travels around the central supermassive black hole in just four years. A total of five telescopes observed the star, with four of these five being combined into one large telescope to allow even more accurate and detailed observations. 'For a star to be in a stable orbit so close and fast in the vicinity of a supermassive black hole was completely unexpected and marks the limit that can be observed with traditional telescopes,' said Peissker.