A few weeks ago, there was a suspected gas leak on the international space station, but NASA couldn’t find the exact location. On Monday night, the situation seemed to get worse. Now, however, the agency speculates that the problem may have been caused by temperature changes. Because even if all the astronauts were isolated in one module, the source of the leak on the international space station could not be found. NASA said astronauts on the international space station were awakened by ground engineers on Monday night. Because of the suspected leak, it urged additional testing of the space station module. Although a little disturbing, but fortunately the scope of investigation has been further reduced. < / P > < p > at present, NASA and Russian space agency have not found the exact leak point, but based on the pressure test of the module, the suspected point has been narrowed to the main working area of Zvezda service module (located on the side of Russian space station). < / P > < p > in accordance with instructions, ISS director Chris Cassidy and Russian cosmonauts Anatoly ivanshin and Ivan Wagner entered the side of the Russian space station to measure and collect data from various positions in the module. During the period of < / P > < p > the astronauts closed the doors of the Zvezda module one by one, and used the “ultrasonic leak detector” to read the pressure value in the module for many times, so as to further reduce the scope of investigation of the leakage point. < / P > < p > NASA finally decided to reopen the hatch and get everyone back to normal operations because the leak had not been found. After all, the ISS itself is not a fully sealed machine, and air leakage within the normal range is still acceptable. < / P > < p > just for safety reasons, NASA and the Russian space agency still investigate the leakage rate slightly higher than the average level to avoid accidents posing a threat to the safety of astronauts. Epic Games accused Google of monopolizing the latter, which may have a better chance than apple