United States scientists at the Laser Interferometric Gravitational Wave Observatory (LIGO) announced recently that they were the third to detect gravitational waves created by the merger of double black holes.

The latest issue of the U.S. Physical Review Letters reports that the two black holes are about 3 billion light-years away from the Earth, with a mass of about 19 and 32 suns before the merger, respectively. The total combined mass is about 49 sun, about 2 sun's mass into energy in the form of gravitational waves released.

On January 4 this year, this gravitational wave signal from the depths of the universe arrived at Earth and was detected by LIGO's two gravitational wave detectors located in Hanford, Washington, and Livingston, Louisiana, with a difference of 3 milliseconds To After analysis, scientists determine that it is a gravitational wave.

Gravitational waves are a kind of ripples of time and space, just like the ripples that the stones thrown into the water. Black holes, neutron stars and other objects in the collision process may produce gravitational waves. Einstein's general theory of relativity predicted the existence of gravitational waves a hundred years ago, but there was a long absence of experimental evidence.

In February 2016, the LIGO project team announced that they were the first to directly detect the presence of gravitational waves in human history, which is considered as an important milestone in physics and astronomy. Four months later, the project team announced the second detection of gravitational waves, which they called "cosmic music."

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