Einstein's theory of general relativity has been proven accurate once again by the recent detection of light from behind a black hole. Researchers observing X-rays flaring from a supermassive black hole picked up a number of what they described as "luminous echoes" that were smaller, arrived later, and had different "colors" than the flares from the front of the black hole. "Any light that goes into that black hole doesn't come out, so we shouldn't be able to see anything that's behind the black hole," said Stanford University research scientist Dan Wilkins. The researchers concluded the black hole's enormous gravitational field was warping space-time (as Einstein predicted) and allowing the "luminous echoes" to travel around the black hole.