Scientists have taken an unprecedented look at the supermassive black hole in our galaxy – and found an unknown star near to it. The new research has allowed scientists to take an estimate of the black hole's mass that is more accurate than ever before. Two studies covering the research are published today in Astronomy & Astrophysics is published today. Both include the work of Reinhard Genzel, who was awarded the Nobel Prize in 2020 for his work on the black hole, known as Sagittarius A*. "We want to learn more about the black hole at the centre of the Milky Way, Sagittarius A*: How massive is it exactly? Do stars around it behave exactly as we expect from Einstein's general theory of relativity?" Genzel said in a statement.