Researchers can now see light emerging from behind a supermassive black hole 800 million light-years away from Earth. According to a study published in the journal Nature, these light waves—called “echoes”—are in the form of X-rays. More than a century ago, Albert Einstein predicted through his general theory of relativity that the gravitational pull of black holes may be so strong that they can distort the magnetic field and bend the surrounding light waves, rather than just them.

According to Einstein’s theory, should be possible to see the light waves emitted from the back of the black hole. This theory was finally to be correct.

Black holes are initially, or simply put, considered empty space. However, when the researchers conducted a more detailed study and discovered that a black hole is a very small area containing a lot of matter, this theory was later overturned. Think of as a ten times larger than our sun squeezed into a sphere the size of a big city. This compression leads to the formation of a very powerful gravitational force, even light cannot escape.

Previous studies have that light waves bend around black holes. However, this is the first time scientists have seen light waves emitted from the other side of the black hole.

Dan Wilkins, an astrophysicist at Stanford University and co-author of the study, said in a statement that any light entering the black hole will not come out, “So, we should not see anything behind the black hole. We. This can be seen because the black hole is distorting space, bending light and distorting the magnetic field around itself.”

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Wilkins and his team used a special high-power X-ray telescope to study the black hole at the center of the spiral galaxy Zwicky 1. They discovered that light in the form of X-rays was shooting out of the black from the back of the hole, an unusual phenomenon.

When a massive explodes into a supernova and collapses on its own, a black hole is formed.