A global team of astronomers, led by Harvard scientists, have captured an image of a black hole for the first time. The result of a massive, years-long effort by dozens of researchers, the Event Horizon Telescope focused on a pair of supermassive black holes – the one at the center of the Milky Way galaxy, known as Sagittarius A*, and a second that lies at the heart of an elliptical galaxy called M87. The work opens the door to allowing astronomers and physicists to put Einstein’s theories of gravity and general relativity to the test under the most extreme conditions in the universe.