Russian rocket and space sources disclosed that ammonia leakage was found outside the U.S. module of the international space station, which was small in scale and did not pose a threat to the astronauts on duty. It is reported that liquid ammonia is a kind of weakly toxic chemical substance, which is used to discharge heat generated by us module into space. However, when the concentration is very high, it has strong toxicity to human beings. According to the source, “professionals found an ammonia leak outside the US module of the International Space Station There is no threat to the station’s personnel. ” < / P > < p > according to the report, the source explained that a few days ago, the leakage point had been found by using special equipment of the United States. “In 2017, the United States had a similar situation at another location on the international space station: the leakage was found, then located, and finally repaired during the astronauts’ space walk.” Currently, Russian astronauts Anatole Ivanisin and Ivan Wagner, as well as American astronaut Christopher Cassidy, are on duty at the international space station. Global Tech