Related by context. Frequent words. (Click for all words.) 73 Sunita Williams 55 International Space Station 55 astronaut 53 NASA astronaut 52 shuttle Discovery 52 Wakata 52 orbital outpost 52 orbiting laboratory 51 Lopez Alegria 51 Padalka 51 astronauts 51 shuttle Atlantis 50 Fincke 50 Thomas Reiter 50 orbiting outpost 49 Tracy Caldwell Dyson 49 Soyuz spacecraft 48 shuttle Endeavour 48 space shuttle Discovery 48 space shuttle Atlantis 48 Mike Fincke 47 Malenchenko 47 shuttle astronauts 47 aboard Endeavour 47 Russian cosmonauts 47 Shuttle Discovery 47 space shuttle Endeavour 47 orbit 46 Flight Engineer 46 Shuttle Endeavour 46 spacewalking 45 Space Shuttle Atlantis 45 Space Shuttle Discovery 45 Chamitoff 45 Space Agency 45 Russian Soyuz spacecraft 45 spacewalks 45 Space Shuttle Endeavour 44 astronaut Buzz Aldrin 44 Endeavour 44 space shuttle 44 Soyuz capsule 43 Space shuttle Discovery 43 Endeavour astronauts 43 Astronaut 43 orbiting lab 43 orbiting 43 Eileen Collins 43 cosmonaut 42 spacewalk 42 spacecraft 42 Space shuttle Endeavour 42 spacewalker 42 Nasa 42 Russian cosmonaut 42 Chandrayaan 42 lunar orbit 42 NASA 42 Soyuz 41 orbiter 41 Atlantis astronauts 41 ISS 41 Discovery astronauts 41 Soyuz TMA 41 Space shuttle Atlantis 41 spaceflight 41 Russian Soyuz 41 undock 41 crewmates 41 Astronauts 41 orbiters 41 PSLV 41 lunar probe 40 cosmonauts 40 lunar surface 40 Space Station 40 shuttle fleet 40 Sriharikota 40 Russian Soyuz capsule 40 manned spacecraft 40 space shuttles 39 spacesuits 39 astronauts aboard 39 human spaceflight 39 ammonia tank 39 APJ Abdul Kalam 39 shuttle missions 39 Atlantis 38 Chiao 38 Rick Husband 38 Grunsfeld 38 astronaut corps 38 Sharipov 38 Mastracchio 37 spacewalking astronauts 37 Baikonur Cosmodrome 37 Sally Ride 37 shuttle 37 Hubble telescope 37 Melroy 37 Simonyi