China launched a total of seven satellites on board one rocket into space on Saturday, successfully completing the last launch mission in 2018. Launched by a Long March-2D rocket from the Jiuquan Satellite Launch Center in northwestern China, six Yunhai-2 satellites are for atmospheric environmental research, and a test communication satellite, the first of the Hongyan communication constellation, will be used to verify the function of mobile communications in low earth orbit (LEO).