European astronomers found out that the star S2 in the centre of the Milky Way has a rosette-shaped orbit, which is another proof of the existence of a black hole in the centre of our galaxy, according to Albert Einstein's general theory of relativity, the Max Planck Institute for Extraterrestrial Physics said, EDNews.net reports citing Sputnik.

S2 is located near Sagittarius A*, a very compact astronomical radio source with a huge mass at the centre of our galaxy, which is believed to be a black hole.

"Einstein's General Relativity predicts that bound orbits of one object around another are not closed, as in Newtonian Gravity, but precess forwards in the plane of motion ... One hundred years later we have now detected the same effect in the motion of a star orbiting the compact radio source Sagittarius A* at the centre of the Milky Way. This observational breakthrough strengthens the evidence that Sagittarius A* must be a supermassive black hole of 4 million times the mass of the Sun", Reinhard Genzel, Director at the Max Planck Institute for Extraterrestrial Physics, said on Thursday.

The discovery has been made with the Very Large Telescope of the European Southern Observatory in Chile.

Einstein's general relativity theory, presented in 1915, explained the anomalous perihelion advance of the Mercury, the first discovered celestial object whose orbit could not be correctly described by the Newtonian physics.