Astronomers have long had their eye on a group of stars that precariously circles just outside the supermassive black hole at the heart of our Milky Way galaxy. And, in a discovery announced by the European Southern Observatory on Thursday, scientists say they’ve finally spotted one of these stars as it travels through the black hole’s gravitational field. It’s the first test of Albert Einstein’s theory of general relativity near a supermassive black hole.

The event, recorded in incredib