Related by context. Frequent words. (Click for all words.) 67 Phoenix Mars Lander 65 Mars lander 64 Spirit rover 64 Phoenix lander 62 lander 57 rover Opportunity 56 spacecraft 56 Mars rover 55 orbiting spacecraft 55 Mars rover Spirit 55 Martian soil 54 Mars Reconnaissance Orbiter 54 Mars rovers 54 robotic spacecraft 54 rover 53 rovers 53 twin rovers 53 Martian surface 52 robotic arm 52 orbiter 52 NASA Mars Odyssey 52 martian 52 orbiting telescope 51 Red Planet 51 Huygens probe 51 NASA Cassini spacecraft 51 NASA 51 Mars Rover 51 Nasa 51 field Infrared Survey 50 unmanned spacecraft 49 NASA Mars Reconnaissance 49 Orbiter 49 space shuttle Endeavour 49 space shuttle Discovery 48 Sensing Satellite 48 Space Shuttle Atlantis 48 lunar orbiter 48 Space Shuttle Endeavour 48 Cassini spacecraft 48 infrared telescope 48 Huygens 47 shuttle Discovery 47 Astronauts aboard 47 Mars Odyssey 47 Cassini 47 CloudSat 47 Cassini orbiter 47 Lunar Crater Observation 46 telescope 46 space shuttle Atlantis 46 Martian 46 satellites orbiting 46 Space Shuttle Discovery 46 Soyuz rocket 46 LCROSS 46 Meridiani Planum 46 Orion spacecraft 45 THEMIS 45 Saturn moon 45 GOCE 45 satellites 45 Shuttle Atlantis 45 Kaguya 45 Flight controllers 45 orbiting satellites 45 astronauts 45 Satish Dhawan Space 45 International Space Station 45 Spacecraft 44 MESSENGER 44 Shuttle astronauts 44 shuttle Endeavour 44 orbiting 44 Hubble telescope 44 wheeled robot 44 Hubble Space Telescope 44 Jet Propulsion Laboratory 44 shuttle Atlantis 44 Discovery astronauts 44 orbiters 44 thruster 44 comet dust 44 heat shield 44 Shuttle Endeavour 44 Mars Exploration 44 space shuttle 44 GLAST 43 comet Wild 43 payload bay 43 comet nucleus 43 Spacewalking astronauts 43 impactor 43 thrusters 43 GPS satellites 43 Chandrayaan 43 Mars Global Surveyor 43 dust devils 43 spacecrafts 43 Shuttle Discovery 43 NASA Deep Impact