Related by context. Frequent words. (Click for all words.) 56 NASA astronaut 56 Sunita Williams 54 Yurchikhin 53 astronaut Sunita Williams 53 Bob Thirsk 53 Sandra Magnus 53 Nicole Stott 52 Lopez Alegria 52 NASA Astronaut 52 International Space Station 51 Shuttle astronauts 51 astronaut 51 Wakata 51 Michael Foale 51 Peggy Whitson 51 Shuttle Endeavour 51 Robonaut 2 50 Flight Engineer 50 Daniel Tani 50 Michael Lopez Alegria 49 Commander Eileen 49 Space Shuttle Atlantis 49 Space Shuttle Endeavour 49 Malenchenko 49 Gregory Chamitoff 49 space shuttle 49 Tracy Caldwell Dyson 48 Lee Archambault 48 Oleg Kotov 48 Christer Fuglesang 48 Krikalev 48 aboard Endeavour 48 Mission Specialists 48 shuttle Discovery 47 Thomas Reiter 47 space shuttle Endeavour 47 space shuttle Discovery 47 Space Shuttle Discovery 47 Caldwell Dyson 47 orbiting laboratory 47 Doug Wheelock 47 Space shuttle Discovery 46 Paolo Nespoli 46 Rick Mastracchio 46 Donald Pettit 46 Astronaut 46 Shuttle Discovery 46 Foale 46 orbital outpost 46 Leroy Chiao 45 Sturckow 45 shuttle 45 Kopra 45 Soyuz rocket 45 Orion spacecraft 45 spacewalking 45 shuttle Endeavour 45 Christa McAuliffe backup 45 Astronauts aboard 45 shuttle Challenger 45 spaceflight 44 Padalka 44 Shuttle Atlantis 44 Russian cosmonauts 44 Mike Fincke 44 Soyuz spacecraft 44 astronauts 44 Russian Soyuz rocket 44 orbiting complex 44 Eileen Collins 44 Edwin Buzz Aldrin 43 astronaut Yang Liwei 43 Vinogradov 43 Space Station 43 Yang Liwei 43 shuttle Atlantis 43 Soyuz craft 43 Soyuz capsule 43 Curbeam 43 Space shuttle Atlantis 43 Garrett Reisman 43 orbiting outpost 43 Charles Simonyi 43 Expedition 43 Mastracchio 43 Atlantis astronauts 43 Russian Soyuz spacecraft 43 Kalpana Chawla 43 lunar orbit 43 Soichi Noguchi 43 Anousheh Ansari 42 Andrew Feustel 42 Soyuz 42 commander Rick Sturckow 42 Shenzhou VII 42 cosmonaut 42 Douglas Wheelock 42 Kazakh steppe 42 astronaut Buzz Aldrin 42 Soyuz TMA 42 spacewalk