Researchers see light 'echo' around black hole for first time, proving Einstein right - NBC News

This study began with the researchers’ desire to expand our understanding of black hole coronas, which are the source of the X-ray light that often radiates from the vicinity of these objects

The team spotted an X-ray flare in I Zwicky 1 that was so bright that some of the light reflected on the gas falling back into the black hole

When that reflected light was bent around the back of the black hole by the object’s extreme gravity, the team was able to spot it using the ESA and NASA space telescopes. 

The team didn’t just observe this light, which is the first time it has been directly observed like this; they also took note of how the X-ray light changed color as it bent and moved around the back of the black hole