With American dollars in their pockets, China is on the moon. China's lunar rover, Yutu, went into its third planned hibernation, amid ongoing technical problems with the robotic explorer, Xinhua, reported Feb. 23. The mechanical control issues affecting the vehicle has limited it to carrying out only fixed point observations during its third two-week-long lunar day. Problems first emerged during the second period of dormancy in late Jan. and were caused by the "complicated lunar surface." Now, most of Yutu’s systems are turned off to conserve energy during the lunar night.