China sends two satellites into orbit on a single carrier rocket for its domestic BeiDou Navigation Satellite System (BDS) in Xichang, southwest China's Sichuan Province, Feb. 12, 2018. The twin satellites, which form a network with four previously launched BeiDou-3 satellites, were the fifth and sixth satellites in the BeiDou-3 family. (Xinhua/Liang Keyan)