Related by context. Frequent words. (Click for all words.) 60 Cernan 50 Neil Armstrong 50 Edwin Buzz Aldrin 50 NASA Administrator 49 Buzz Aldrin 48 NASA astronaut 47 astronaut Buzz Aldrin 45 astronaut 44 NASA Astronaut 43 space shuttle 43 lunar landing 43 Aldrin 42 Armed Services 42 NASA 42 astronauts 42 Alan Shepard 42 Apollo astronauts 41 spaceflight 41 lunar surface 41 moon 40 Nasa 40 Eileen Collins 40 Mariana Trench 40 Retired Lt. Gen. 39 Mission Specialists 39 Coast Guard Commandant Adm. 39 Charles Bolden 39 National Aeronautics 39 astronautics 39 Michael Foale 39 Gorie 39 Mercury Gemini 39 Astronaut 38 Christa McAuliffe backup 38 Columbia Accident Investigation 38 Marine Corps commandant 38 Hubble servicing 38 human spaceflight 38 Astronautics 38 Yuri Gagarin 38 spaceflights 38 Skylab 38 lunar module 38 Marine Corps Commandant Gen. 38 Sean O'Keefe 37 Crew Exploration 37 shuttle astronauts 37 Ares rocket 37 Planetary Society 37 Retired Adm. 37 Kalpana Chawla 37 Dennis Tito 37 Gene Roddenberry 37 Boehlert 37 lunar rover 37 appropriations subcommittee 36 astronaut Sunita Williams 36 Sally Ride 36 Gen. 36 Space Shuttle 36 Retired Maj. Gen. 36 Marine commandant 36 Krikalev 36 Commander Eileen 36 subcommittee 36 Defense Appropriations Subcommittee 36 Systems Mission Directorate 35 Adm. Mike 35 retired Navy admiral 35 James Doohan 35 John Grunsfeld 35 Barbara Boxer D Calif 35 House Appropriations subcommittee 35 Orbiting Carbon Observatory 35 manned spaceflight 35 Appropriations Subcommittee 35 Space Shuttle Columbia 35 Carl Levin D Mich 35 Heidemarie Stefanyshyn Piper 35 Schirra 35 Appropriations subcommittee 35 astronaut corps 35 Lee Archambault 35 Hobaugh 35 shuttle Challenger 35 lunar exploration 35 planetary exploration 35 Garriott 35 Adm. 35 Senate Appropriations subcommittee 35 manned missions 35 Warner R Va 34 Sandra Magnus 34 International Space Station 34 Defense Secretary 34 Stephen Frick 34 Mark Polansky 34 Supreme Allied 34 Richard Garriott 34 retired admiral 34 Deep Impact mission