Related by context. Frequent words. (Click for all words.) 63 Buzz Aldrin 57 Alan Shepard 54 Yuri Gagarin 51 lunar landing 49 Aldrin 48 Sputnik 45 astronaut 45 Apollo astronauts 45 lunar surface 44 giant leap 42 Mars Rover 42 Gagarin 41 Right Stuff 40 manned spacecraft 40 space shuttle 40 spacesuit 39 moon 39 Apollo 39 NASA 39 spaceflight 39 astronauts 39 Space Shuttle Discovery 39 NASA astronaut 39 Eileen Collins 39 Schirra 38 manned missions 38 Space Exploration 38 outer space 38 Abraham Lincoln 38 Charles Lindbergh 38 spaceship 38 International Space Station 38 Astronaut 37 Saturn V 37 manned spaceflight 37 Sir Edmund Hillary 37 Nasa 36 Endeavour astronauts 36 Elon Musk 36 Fred Astaire 36 Amelia Earhart 36 Garriott 36 capsule 36 space shuttles 36 shuttle Discovery 35 lunar exploration 35 Walter Cronkite 35 spacecraft 35 Carl Sagan 35 Charles Bolden 35 Space Odyssey 35 cosmonaut 35 cosmonauts 35 Mars 35 Dwight Eisenhower 35 Shenzhou 35 Burt Rutan 35 shuttle Atlantis 35 Sally Ride 35 Gettysburg Address 35 Mars rover 35 Christa McAuliffe 34 Space Agency 34 Space Station 34 Shuttle Discovery 34 Simonyi 34 Have Dream 34 Space Shuttle 34 Jules Verne 33 NASA Administrator 33 moonwalk 33 SpaceShipOne 33 APJ Abdul Kalam 33 orbit 33 Lyndon Johnson 33 Soyuz capsule 33 Bill Shankly 33 Lovell 33 Mark Polansky 33 Fincke 33 Rutan 33 lunar probe 33 Chandrayaan 33 National Aeronautics 33 Buddy Holly 33 Space Shuttle Endeavour 33 Lyndon Baines Johnson 32 Russian cosmonauts 32 Red Planet 32 Joe Namath 32 Cronkite 32 Smithsonian Institution 32 Rick Husband 32 Mission Control 32 Soyuz spacecraft 32 Albert Einstein 32 Virgin Galactic 32 Ronald Reagan 32 Human Genome Project 32 Tim Berners Lee 32 Berry Gordy