A new model of China's carrier rocket Long March-6 carrying 20 micro-satellites blasts off from the Taiyuan Satellite Launch Center in Taiyuan, capital of north China's Shanxi Province, Sept. 20, 2015. 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/Yan Yan)