Related by context. Frequent words. (Click for all words.) 49 crewmen 47 astronauts 47 lunar module 44 spacecraft 44 crewmembers 44 Piers Sellers 44 astronaut 44 unmanned spacecraft 43 Edwin Buzz Aldrin 43 Apollo astronauts 43 aviator Amelia Earhart 43 spaceship 42 crewmates 42 capsule 42 Shuttle astronauts 42 Alan Shepard 42 Voyager spacecraft 42 orbit 42 crewman 42 Clyde Tombaugh 41 Commander Peggy Whitson 41 teacher Christa McAuliffe 41 Mars rover 41 Messenger spacecraft 41 Cernan 41 NASA astronaut corps 41 Wernher von Braun 41 Sir Ernest Shackleton 40 shuttle Challenger 40 Daniel Tani 40 Taurus XL rocket 40 Neil Armstrong 40 Endeavour astronauts 40 Gregory Chamitoff 40 Ares IX rocket 40 NASA 40 robotic spacecraft 40 Astronauts 40 spacemen 40 aboard 39 space shuttle 39 James Doohan 39 Sputnik satellite 39 Soyuz capsule carrying 39 Robert Peary 39 suborbital flight 39 crewmember 39 NASA astronaut 39 Space Shuttle Discovery 39 Mars Pathfinder 39 satellite Sputnik 39 Julie Payette 39 June Scobee Rodgers 39 Tim Kopra 39 crew 39 Saturn V 39 New Horizons spacecraft 38 space shuttle Discovery 38 Chuck Yeager 38 Readdy 38 astronaut Buzz Aldrin 38 Ariane rocket 38 orbit insertion 38 Ernest Shackleton 38 Schirra 38 Israeli astronaut Ilan 38 Soviet cosmonaut Yuri Gagarin 38 Leland Melvin 38 dirigible 38 Astronaut 38 orbited 38 explorers 38 rovers Spirit 38 rover Opportunity 38 voyage 38 Mike Melvill 38 manned spaceflight 38 Mars Lander 38 Tombaugh 38 orbiting 38 Expedition 37 Space Shuttle Endeavour 37 spaceplane 37 Douglas Wheelock 37 Challenger exploded 37 tourist Charles Simonyi 37 Dan Tani 37 Tuskegee Airman 37 spacecrafts 37 Atlantis astronauts 37 Space Shuttle Columbia 37 Soyuz rocket 37 lifeboat 37 lunar landing 37 Astronaut Buzz Aldrin 37 Zamka 37 Mercury Gemini 37 Shuttle Discovery 37 Commander Eileen 37 astronauts aboard 37 Lee Archambault