Related by context. Frequent words. (Click for all words.) 67 astronaut Buzz Aldrin 57 Buzz Aldrin 51 Soviet cosmonaut Yuri Gagarin 50 Edwin Buzz Aldrin 47 Neil Armstrong 47 NASA astronaut 46 NASA Astronaut 45 Mercury Gemini 45 Alan Shepard 45 ZERO G 44 astronaut 44 Cernan 43 Apollo astronauts 43 Dennis Tito 42 astronaut Sunita Williams 42 June Scobee Rodgers 42 Aldrin 41 lunar surface 41 Drew Lachey 41 Yuri Gagarin 41 teacher Christa McAuliffe 41 cosmonaut 41 Sally Ride 41 John Grunsfeld 41 Christa McAuliffe backup 41 moon 41 Lance Bass 41 Hubble servicing 40 Saturn V 40 Apollo 40 astronaut Yang Liwei 40 Shuttle Discovery 40 Anousheh Ansari 39 Adler Planetarium 39 Gregory Chamitoff 39 Kalpana Chawla 39 NASA 39 Orion spacecraft 39 Solar Dynamics 39 Yuri Night 39 Astronauts aboard 39 Mars Pathfinder 39 Space Shuttle Discovery 39 Space Shuttle Atlantis 39 Yang Liwei 39 spaceflight 39 Space Shuttle 38 lunar landing 38 Space Shuttle Endeavour 38 NASA Kepler 38 Sandra Magnus 38 NASA Lunar Reconnaissance 38 Cassini Huygens 38 G Madhavan Nair 38 Mark Polansky 38 Scott Parazynski 38 space shuttle 38 lunar module 37 Richard Feynman 37 Professor Stephen Hawking 37 APJ Abdul Kalam 37 Eileen Collins 37 Leeza Gibbons 37 Aiden Turner 37 Lee Archambault 37 astronauts 37 Piers Sellers 37 orbiting spacecraft 37 Carl Sagan 37 Orbiter 37 orbit 37 spacecraft 37 Sherpa Tenzing Norgay 37 Christa McAuliffe 37 Hubble Telescope 37 Chesley Sully Sullenberger 37 Anna Trebunskaya 37 Shuttle astronauts 37 lunar missions 37 Orbiting 37 Mars Rover 37 Nicole Stott 37 Atlas V 37 lunar rover 37 Stardust spacecraft 37 spaceflights 37 Space Exploration 37 Ace Frehley 37 Right Stuff 37 NASA Deep Impact 37 Andrew Feustel 37 Commander Eileen 36 Dominique Dawes 36 International Space Station 36 Astronaut 36 Donny Osmond 36 Mission Specialists 36 astronaut Julie Payette 36 Hubble Space Telescope 36 Rakesh Sharma 36 Spaceflight