Related by context. Frequent words. (Click for all words.) 68 spacecraft 65 orbiting 65 spacecrafts 65 robotic spacecraft 64 interplanetary spacecraft 64 orbit 64 unpiloted 63 reusable spacecraft 63 Cassini Huygens 62 unmanned lunar 62 manned spaceship 61 orbit insertion 61 SpaceX Falcon 9 61 manned spacecraft 60 spacecraft orbiting 60 orbital 60 Shenzhou V 60 unmanned spacecraft 60 ion propulsion 60 Automated Transfer Vehicle 59 orbiter 59 SMOS 59 spaceplane 59 Stardust spacecraft 59 Mars orbiter 58 New Horizons spacecraft 58 spaceship 58 lunar orbiter 58 International Space Station 58 Shenzhou VII 58 Ares IX rocket 57 PSLV C# 57 lunar missions 57 Ariane rocket 57 Voyager spacecraft 57 Dragon capsule 57 orbiting spacecraft 57 Mars Pathfinder 57 Dragon spacecraft 56 JAXA 56 NanoSail D 56 GOCE 56 manned missions 56 Shenzhou VI 56 orbiting observatory 56 Discovery STS 56 lunar orbit 56 Earth orbit 56 orbiters 56 Launch Vehicle 55 Baikonur Kazakhstan 55 NASA Kepler 55 NASA 55 space shuttle 55 Shuttle astronauts 55 planetary missions 55 ESOC 55 Discovery payload bay 55 radar altimeter 55 Soyuz 55 Hayabusa probe 55 TacSat 55 Plesetsk 55 unmanned 55 Soyuz capsule 55 LCROSS mission 55 orbiting Saturn 54 shuttle Atlantis 54 Space Shuttle 54 Gravity Probe B 54 Space Shuttle Discovery 54 Orion spacecraft 54 Soyuz rocket 54 CALIPSO 54 COROT 54 Chandrayan 54 Perminov 54 Nasa 54 Space Shuttle Atlantis 54 Space Station 54 Ares IX 54 rovers Spirit 54 Crew Exploration 54 GSLV D3 54 space shuttle Discovery 54 Launch Pad #B 54 orbits 54 geosynchronous orbit 54 Global Surveyor 53 Mars Lander 53 lunar probe 53 remote sensing satellites 53 circular orbit 53 Discovery astronauts 53 ExoMars 53 Astronauts aboard 53 orbited 53 human spaceflight 53 Messenger spacecraft 53 hypersonic flight 53 ISS Expedition