Beijing Time At 16:00 on October 16, 2017, the National Science Foundation held a press conference announcing the first double neutron star discovery by the LIGO and Virgo on August 17, 2017 Combined with the gravitational wave event (code GW170817), the International Gravity Wave Electromagnetic Observations Alliance found the electromagnetic counterpart of this gravitational wave event.

Two merged neutron stars

China's first space X-ray astronomy satellite - eye HXMT telescope - in the gravitational wave event successfully monitored the gravitational wave source where the sky, its gamma-ray electromagnetic counterparts (referred to as the gravitational wave flash) in the high-energy region MeV and millions of electron volts) provide important contributions to a full understanding of the physical mechanism of this gravitational-wave event and gravitational wave flash. Relevant exploration results are published in a study that reports on this historic finding In the paper.

This is the first time that mankind has simultaneously detected the gravitational waves and their electromagnetic counterparts and is an extremely important milestone in gravitational wave astronomy. It has an epoch-making significance in the history of the development of astronomy and physics and officially opened the era of gravitational wave astronomy.

What is a gravitational wave

The article "Voices of Germany" states that in general relativity, gravity can be explained by space-time curvature. Assuming that space is a trampoline: a tennis ball on a trampoline, it will only stop there quietly; and if at this time sitting on a trampoline one person, the trampoline will be downwards depression, tennis will roll to the depression , And the more you get closer, the faster you roll. Tennis is "drawn" by the depression. Sitting on a trampoline body heavier people, the more obvious depression, tennis easier to roll depression.

By the same token, the greater the mass of the object that causes the change in time and space, the greater the degree of bending in time and space and the greater the "gravitational force" produced. At the moment when the person gets on the trampoline, the bending of the trampoline will spread outwards from the center of the depression; at this time, if the high-speed camera is used for observation and the slow motion is played back, the diffusion process will be found in a fluctuating manner . Just like a stone on a calm water, there will be ripples in a circle. This is a gravitational wave. Gravitational waves generated in the acceleration of objects, such as stellar explosion, black hole collision, will produce gravitational waves. Gravitational waves can cause the expansion of space-time, affecting the structure of space-time.

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