Related by context. Frequent words. (Click for all words.) 37 Aldrin 37 John Grunsfeld 36 astronaut Buzz Aldrin 36 Eileen Collins 36 Buzz Aldrin 33 Stefanyshyn Piper 33 Daniel Tani 33 Grunsfeld 33 Mike Fincke 32 Mark Polansky 32 Fincke 32 Burt Rutan 32 commander Rick Sturckow 32 Rick Husband 32 Ilan Ramon 31 Melroy 31 Yuri Gagarin 31 Foale 31 moon 31 space shuttle 30 Kalpana Chawla 30 Chiao 30 Gerstenmaier 30 Wakata 30 aboard Endeavour 30 Gene Roddenberry 30 Melvill 30 moonwalk 29 spaceship 29 lunar landing 29 Malenchenko 29 spaceflight 29 spacemen 29 Solar Impulse 29 NASA astronaut 28 Chuck Yeager 28 cosmonaut 28 Endeavour 28 Leonard Nimoy 28 Neil Armstrong 28 Donny Osmond 28 Apollo astronauts 28 astronaut 27 Sally Ride 27 Soyuz capsule 27 Space Shuttle Discovery 27 astronauts 27 International Space Station 27 crewmates 27 manned spacecraft 27 Alan Shepard 27 Challenger exploded 27 Bolden 27 Baikonur 27 manned spaceflight 26 Skylab 26 Endeavour astronauts 26 spacewalker 26 Baikonur Cosmodrome 26 George Takei 26 outer space 26 Simonyi 26 cosmonauts 26 Discovery astronauts 26 Adler Planetarium 26 Mastracchio 26 SpaceShipOne 25 Nespoli 25 Tracy Caldwell Dyson 25 Space Station 25 Padalka 25 Space Shuttle Endeavour 25 lunar lander 25 Tani 25 moon landings 25 Space Shuttle Atlantis 25 lunar exploration 25 Dennis Tito 25 Space Shuttle 25 Kristi Yamaguchi 25 Shenzhou 25 manned missions 25 orbit 25 Kopra 24 Bowersox 24 Soyuz 24 Saturn V 24 Shuttle Discovery 24 human spaceflight 24 Dittemore 24 Apollo 24 shuttle Discovery 24 Yurchikhin 24 James Doohan 24 Mars Rover 24 Lance Bass 24 space shuttles 24 lunar surface 24 Satcher 24 Walter Cronkite 24 Sharipov