Related by context. Frequent words. (Click for all words.) 63 lunar orbiter 59 unmanned lunar 58 spacecraft 58 manned spacecraft 57 Resourcesat 2 56 robotic explorers 56 DubaiSat 1 56 lunar probe 56 lunar surface 56 Tanegashima Space Center 56 manned spaceship 55 lunar rover 55 spacecrafts 55 lunar missions 55 NASAs 55 lunar exploration 54 Orion spacecraft 54 robotic spacecraft 54 reusable spacecraft 54 remote sensing satellite 54 spacecraft orbiting 54 Messenger spacecraft 54 Shenzhou V 53 asteroid Itokawa 53 Oceansat 2 53 interplanetary spacecraft 53 NASA Lunar Reconnaissance 53 lunar outpost 53 nanosatellite 53 SMOS 53 lunar orbit 52 Soyuz rocket 52 Mars Pathfinder 52 orbited Earth 52 Baikonur Kazakhstan 52 Xichang 52 manned missions 52 unmanned spacecraft 52 Hayabusa probe 52 Lunar Prospector 52 Lunar Reconnaissance Orbiter 52 orbiters 52 NASA Stardust spacecraft 52 infrared telescope 52 Shenzhou VII 52 KSLV 1 52 remote sensing satellites 52 agency Roskosmos 52 Ariane rocket 52 GOCE 52 moon 51 polar orbiting 51 NASA Kepler 51 Tiangong 51 Sensing Satellite LCROSS 51 Crew Exploration 51 orbit 51 Chandrayan 51 PSLV C# 51 Cassini Huygens 51 Wideband Global 51 LCROSS mission 51 geostationary 50 orbiter 50 ion propulsion 50 SELENE 50 Beidou 50 SpaceX Falcon 9 50 spaceplane 50 lunar 50 geostationary orbit 50 Orion Crew 50 geosynchronous orbit 50 Kaguya 50 Stardust spacecraft 50 MetOp 50 planetary missions 50 cosmonaut Yuri Gagarin 50 Yang Liwei 50 New Horizons spacecraft 50 Voyager spacecraft 50 robotic probes 50 Apollo missions 49 orbiting telescope 49 ICESat 49 Galileo spacecraft 49 orbiting Saturn 49 astronaut Yang Liwei 49 lunar lander 49 pressurized compartment 49 Chang'e 49 field Infrared Survey 49 International Space Station 49 Plesetsk 49 Lunar Module 49 Shenzhou VI 49 Itokawa 49 unpiloted 49 orbiting 49 lunar landing 49 Vostochny