According to foreign media CNET reports, astronomers have found that two neutron stars collide with each other about 130 million light-years away from the earth. On August 17, 2017, the collision between some of the most dense celestial bodies in the universe produced gravitational waves and X-rays. Dozens of telescopes on earth have captured this rare merger at different wavelengths of the electromagnetic spectrum. First, a burst of high-energy gamma rays, followed by a burst of light and ultraviolet, radio and infrared signals. < / P > < p > about 9 days after the collision, X-ray signals were received by NASA’s Chandra observatory. According to astronomers’ understanding of neutron stars, they should have disappeared by now. < / P > < p > but in a new study published in the Journal of the Royal Astronomical Society on Monday, researchers studied the neutron star collision event, gw170817, and found that the X-ray signal could still be detected 1000 days later. < / P > < p > “we really don’t know what to expect from this point, because all our models predict that there are no X-rays,” Eleonora Troja, an astrophysicist at NASA’s Goddard Space Flight Center and lead author of the study, said in a press release. Gw170817 is the first neutron star merging event detected by three gravitational wave observatories on earth. The three major observatories were able to triangulate the position of the merger immediately after the merger, enabling researchers to turn the telescope into space and observe the event carefully. < / P > < p > since no neutron star collision events have been observed (only two have been recorded and confirmed so far), scientists have to rely on models to predict the consequences. In most cases, these models are consistent with the detection results of gw170817. When two neutron stars collide, they will emit gamma ray jets and huge bright gas explosions, known as & quot; kilonovae & quot;. These events are transient – by disappearing a few days or weeks after they are observed. < / P > < p > but Chandra, NASA’s X-ray Observatory, still detected X-rays at the site when it focused on the merger event in February, two and a half years after its eruption. The latest measurement results show that the signal has faded, but the X-ray signal can still be detected. Why can these X-rays still be detected? This is a problem that researchers are trying to solve. < / P > < p > may be that there is an additional component in neutron star merging, which has not been considered by the model before. It may also be that the dynamics of the energy released after the collision are somewhat different from what scientists expect. One exciting possibility is that the combined debris represents an X-ray emitting neutron star – although more analysis is needed to determine the source of the signal. Astronomers will turn the telescope to gw170817 in December, providing another opportunity to unravel the mystery of the merger. SpaceX beat blue origin and Northrop Grumman to win a $316 million air force contract