Related by context. Frequent words. (Click for all words.) 59 Soviet cosmonaut Yuri Gagarin 56 NASA astronaut 54 astronaut 53 astronaut Yang Liwei 53 Richard Garriott 52 Dennis Tito 51 Garriott 50 Mars Pathfinder 50 Yuri Gagarin 49 Leroy Chiao 49 Sandra Magnus 49 spaceflight 49 Russian cosmonaut 49 Cassini Huygens 49 Fyodor Yurchikhin 49 Anousheh Ansari 49 Nicole Stott 49 astronaut Buzz Aldrin 48 space shuttle 48 astronauts 48 Piers Sellers 48 Yang Liwei 48 astronaut Daniel Tani 48 Japanese astronaut Koichi 48 International Space Station 48 June Scobee Rodgers 48 Gregory Chamitoff 48 Michael Foale 48 astronaut Julie Payette 47 cosmonaut 47 astronaut Peggy Whitson 47 Christa McAuliffe backup 47 spaceflights 47 G Madhavan Nair 47 Astronauts aboard 47 Edwin Buzz Aldrin 47 Astronaut 47 Daniel Tani 47 Alan Shepard 46 NASA Astronaut 46 Greg Chamitoff 46 NASA Kepler 46 NASA 46 Buzz Aldrin 46 Cernan 46 shuttle Challenger 46 Shuttle commander 46 Caldwell Dyson 46 Apollo astronauts 46 Simonyi 46 Charles Bolden 45 Mikhail Kornienko 45 Bob Thirsk 45 Malenchenko 45 Charles Simonyi 45 John Grunsfeld 45 manned spaceflight 45 Oleg Kononenko 45 Robert Satcher 45 teacher Christa McAuliffe 45 Burt Rutan 45 astronaut Paolo Nespoli 45 Shuttle astronauts 45 designer Burt Rutan 44 Peter Diamandis 44 New Horizons spacecraft 44 Dick Rutan 44 Baikonur Kazakhstan 44 Nasa 44 Neil Armstrong 44 spaceship 44 Gorie 44 robotic spacecraft 44 astronautics 44 Grunsfeld 44 cosmonauts 44 Space Agency 44 Robert Heinlein 43 Wakata 43 Gene Roddenberry 43 manned spacecraft 43 Wernher von Braun 43 lunar orbiter 43 unmanned lunar 43 Russian cosmonauts 43 Andrew Feustel 43 Fincke 43 Hubble telescope 43 Krikalev 43 Professor Stephen Hawking 43 Sunita Williams 43 orbiting telescope 43 spacecraft 43 Marcia Dunn 43 Padalka 43 NASA Administrator 43 Eileen Collins 43 Kalpana Chawla 42 By Irene Klotz 42 Yurchikhin 42 Hoshide