Related by context. Frequent words. (Click for all words.) 62 Spirit rover 61 rover Opportunity 57 lander 57 Mars rover Spirit 57 martian 57 orbiting spacecraft 56 rover 56 Martian surface 55 Gusev Crater 54 spacecraft 54 lunar orbit 54 Victoria Crater 54 Phoenix Mars Lander 54 Phoenix lander 53 Itokawa 53 robotic spacecraft 53 Huygens 53 PASADENA Calif. NASA 52 Taurus XL rocket 52 Cassini Huygens 52 Meridiani Planum 52 Red Planet 52 Mars Reconnaissance Orbiter 51 rovers 51 Huygens probe 51 NASA Mars Odyssey 51 Global Surveyor 51 Mars rover 51 Cassini orbiter 51 orbiting observatory 50 Sensing Satellite 50 Saturn moon 50 lunar module 50 Martian soil 50 Mars 50 sols 50 orbiter 50 Lunar Crater Observation 50 GOCE 50 Lyndin 49 Space Shuttle Atlantis 49 circular orbit 49 Mars Odyssey 49 orbiting telescope 49 infrared telescope 49 Cassini spacecraft 49 CloudSat 49 Comet Tempel 1 48 geosynchronous orbit 48 lunar surface 48 NASA Mars Reconnaissance 48 unmanned lunar 48 Cassini 48 LCROSS 48 MESSENGER 47 Mars Rover 47 NASA Kepler 47 orbiting 47 Martian 47 panoramic camera 47 orbit 47 ICESat 47 Nasa 47 Jet Propulsion Laboratory JPL 47 Mars Exploration 47 Mars lander 47 comet nucleus 47 Mars rovers 47 spacecrafts 46 NASA Cassini spacecraft 46 crater rim 46 unmanned spacecraft 46 Chandrayaan 46 Dragon capsule 46 Spacecraft 46 Orbiter 46 comet Wild 46 Orbiting Carbon Observatory 46 wheeled robot 46 COROT 46 LRO 46 boulder strewn 46 Jet Propulsion Laboratory 46 impactor 46 distress beacon 46 flyby 46 Space Shuttle Discovery 45 Earth orbit 45 robotic arm 45 orbiting complex 45 Shuttle astronauts 45 scramjet 45 NASA Jet Propulsion Laboratory 45 asteroid 45 Commander Eileen 45 field Infrared Survey 45 lunar orbiter 45 ExoMars 45 Solar Dynamics 45 outer planets 45 satellites orbiting