An international collaboration presents paradigm-shifting observations of the gargantuan black hole at the heart of distant galaxy Messier 87
On April 10, 2019, scientists from the Event Horizon Telescope announced a result that will change our understanding of the universe: the first-ever image of a black hole’s event horizon, the point at which light can no longer escape the black hole’s gravitational pull. Using linked telescopes from around the globe, EHT’s team measured the ring of photons circling the black hole at the center of galaxy Messier 87, 55 million light-years from Earth. The observations further confirm Einstein’s general theory of relativity.
“We have taken the first picture of a black hole,” said EHT project director Sheperd S. Doeleman of the Center for Astrophysics | Harvard & Smithsonian. “This is an extraordinary scientific feat accomplished by a team of more than 200 researchers.”
Black holes are extraordinary cosmic objects with enormous masses but extremely compact sizes. The presence of these objects affects their environment in extreme ways, warping spacetime and super-heating any surrounding material.
“If immersed in a bright region, like a disc of glowing gas, we expect a black hole to create a dark region similar to a shadow — something predicted by Einstein’s general relativity that we’ve never seen before, explained chair of the EHT Science Council Heino Falcke of Radboud University, the Netherlands. “This shadow, caused by the gravitational bending and capture of light by the event horizon, reveals a lot about the nature of these fascinating objects and allowed us to measure the enormous mass of M87’s black hole.”
“We have achieved something presumed to be impossible just a generation ago,” concluded Doeleman. “Breakthroughs in technology, connections between the world’s best radio observatories, and innovative algorithms all came together to open an entirely new window on black holes and the event horizon.”