For the first time, astronomers saw a flash of the light from a collision of two black holes. Such phenomenon in outer space was recorded for the first time. Two black holes met and merged at a distance of 7.5 billion light years, forming a vortex of matter surrounding a large supermassive black hole. That whirlpool forms an accretion disk and it rotates at the event horizon of a black hole.
This is a special boundary point, after that gravitational power does not allow even light to escape. This is one of the reasons why astronomers have never been able to see the process of merging two black holes.
In the absence of light radiation, fusion processes can be identified only when gravitational waves are detected, creating ripples in space. It is formed during the collision of massive objects. Albert Einstein predicted that phenomenon, believing that gravitational waves would ever be detected.
On the Earth, they could not be caught due to vibration and noise. It seemed that Einstein was right and his assumptions were considered true for a hundred years. In 2015, when black holes merged at a distance of 1.3 billion light-years, gravitational waves were first recorded.
This discovery has formed a new direction in astronomy. And the scientists were able to compare the collision of black holes with flashes of the light, that was considered impossible. After the fusion process of the two black holes observed today, the collision force sent a newly formed black hole passing through the gas of the accretion disk around the larger black hole.
The reaction of the gas to the acceleration of the wave created a bright flash, which was able to be seen using the telescopes. The scientists believe that they will be able to see another flash from the same black hole in a few years.