A rocket carrying the LaoSat-1 satellite blasts off from the Xichang Satellite Launch Center in Xichang, southwest China's Sichuan Province, Nov. 21, 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/Qin Haishi)