Related by context. Frequent words. (Click for all words.) 35 Aldrin 29 Roco 27 Pontes 27 Satcher 26 Bolden 24 Chiao 24 Tani 23 Dittemore 23 Squyres 23 Melroy 22 NASA astronaut 22 astronaut 21 Tondo 21 Gagarin 21 Fincke 20 Alan Shepard 20 Reisman 20 Planetary Society 20 Heras 19 Mars 19 Nasa 19 Noguchi 19 Astronaut 19 astronauts 18 Bowersox 18 Gerstenmaier 18 moon 18 JPL 18 Mike Fincke 18 orbit 17 Apollo 17 Lopez Alegria 17 NASA 17 Mark Polansky 17 Buzz Aldrin 17 Garriott 17 Padalka 16 Mission Control 16 Zhai 16 Yuri Gagarin 16 Grunsfeld 16 SPACE.com 16 Merckx 16 spacecraft 16 HTV 15 Wakata 15 Parazynski 15 crewmates 15 lunar landing 15 outer space 15 lunar exploration 15 Hayabusa 15 Sharipov 15 Massimino 15 zero gravity 15 NASA Administrator 14 Eileen Collins 14 Constellation 14 Russian cosmonauts 14 Soyuz 14 Neil Armstrong 14 Astronauts 13 Discovery astronauts 13 spacewalker 13 Mars Rover 13 spacewalkers 13 space shuttle 13 cosmonauts 13 Endeavour 13 Baikonur 13 Endeavour astronauts 13 Armstrong 13 moonwalk 13 Space Shuttle Discovery 13 Space Station 13 Hubble 12 cosmonaut 12 manned missions 12 spaceflight 12 orbiter 12 shuttle missions 12 ISS 12 manned spacecraft 11 Atlantis 11 weightlessness 11 Space Shuttle 11 lunar surface 11 space 11 Discovery 10 Solar Impulse 10 International Space Station 10 Soyuz TMA 10 human spaceflight 10 microgravity 8 manned spaceflight 8 space shuttles 8 Baikonur Cosmodrome 8 Soyuz capsule 8 Shenzhou 7 spacesuit 6 lunar orbit