From the article: > 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 th

From the article: > 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 I love that scientists are so careful about stating that something is absolute fact when they can't be 100% sure. The public's idea of things is definitely that Sagittarius A* is a supermassive black hole, but that compact radio source could be something else, so they're careful to note that.