The Sgr A* is more than a thousand times smaller and less massive than M87*. In 2019, the collaboration had released the first image of the black hole M87*, at the centre of the more distant Messier 87 galaxy. This is not the first black hole to be imaged by ETH. The EHT observed Sgr A* on multiple nights in 2017, collecting data for many hours in a row, similar to using a long exposure time on a camera. To image it, the team created the powerful EHT, which linked together eight existing radio observatories across the planet to form a single “Earth-sized” virtual telescope. The black hole is about 27,000 light-years away from Earth. “These unprecedented observations have greatly improved our understanding of what happens at the very centre of our galaxy, and offer new insights on how these giant black holes interact with their surroundings,” Bower said. “We were stunned by how well the size of the ring agreed with predictions from Einstein’s Theory of General Relativity,” EHT Project Scientist Geoffrey Bower from the Institute of Astronomy and Astrophysics, Academia Sinica, Taipei said in a statement. The new view captures light bent by the powerful gravity of the black hole, which is four million times more massive than our Sun.