What do we know about Sagittarius A*, the monster black hole in the heart of our galaxy? - ABC News

11:30am PDT - May 11th, 2022    science - ABC News (AU)

There's big news on the (event) horizon: for the first time tonight, we'll get a good look at the supermassive black hole in the middle of the Milky Way. But how do we know it's there at all?