Long March-7 carrier rocket is transferred vertically to the Wenchang Space Launch Center in Wenchang, south China's Hainan Province, June 22, 2016. With a Long March-3B rocket putting a new communication satellite into orbit on March 10, 2019, China's Long March carrier rocket series completed 300 launches, having sent more than 500 spacecraft into space since 1970. (Xinhua/Li Guoli)