Related by context. Frequent words. (Click for all words.) 71 NASA astronaut 67 Astronaut 62 astronaut 59 NASA 56 Space Station 56 Mission Specialists 53 Space Shuttle Endeavour 53 Flight Engineer 52 Astronauts 52 Shuttle Launch 51 International Space Station 51 Spaceflight 50 Doug Wheelock 50 Space Shuttle 50 Soichi Noguchi 50 Shuttle astronauts 50 NASA JPL 50 NASA Space Shuttle 50 Nicole Stott 49 Sandra Magnus 49 Peggy Whitson 48 astronauts 48 spacewalker 48 Lopez Alegria 48 Space 48 Nasa 48 Shuttle Discovery 47 Buzz Aldrin 47 Spacecraft 47 Space Shuttle Atlantis 47 Paolo Nespoli 47 Space Shuttle Discovery 47 Lee Archambault 47 Kalpana Chawla 47 Spacewalkers 47 Spacewalk 47 Wakata 47 spacesuit 47 space shuttle 47 John Grunsfeld 47 Robert Behnken 47 Cernan 46 Shuttle Atlantis 46 shuttle Discovery 45 Mars Rover 45 Tracy Caldwell Dyson 45 astronaut corps 45 Space Flight 45 Yang Liwei 45 commander Peggy Whitson 45 Space Agency 45 Krikalev 45 Shuttle commander 45 spaceflight 45 orbiter 45 Robonaut 2 45 Yurchikhin 44 Commander Eileen 44 cosmonaut 44 Rick Mastracchio 44 Shuttle Endeavour 44 NASA Administrator 44 spaceflights 44 Eileen Collins 44 Daniel Tani 44 Eric Boe 44 Foale 44 ARISS 44 Stephen Frick 44 STS 44 space shuttle Discovery 44 shuttle 44 shuttle Atlantis 44 Russian cosmonaut 43 Andrew Feustel 43 astronaut Sunita Williams 43 astronaut Buzz Aldrin 43 ISS 43 spacewalking 43 Vinogradov 43 Chiao 43 Systems Mission Directorate 43 Space Shuttle Program 43 Malenchenko 43 Shuttle 43 Christa McAuliffe backup 43 Zamka 43 Padalka 43 Fincke 43 Caldwell Dyson 43 astronautics 43 Anousheh Ansari 43 Stefanyshyn Piper 42 commander Rick Sturckow 42 Sturckow 42 Astronautics 42 Cosmonaut 42 AIAA 42 NASA Goddard 42 NASA Ames 42 spacecraft