GROVER rover testing, Greenland. NASA's GROVER (Goddard Remotely Operated Vehicle for Exploration and Research) Earth-bound rover during testing on the Greenland ice sheet. This solar-powered autonomous student-designed rover was developed by NASA's Goddard Space Flight Center, USA. This trial in Greenland will serve as a test of using rovers in harsh polar regions to gather data. Photographed in May 2013.