Related by context. Frequent words. (Click for all words.) 57 Eugene Cernan 56 astronaut Buzz Aldrin 56 NASA astronaut 56 NASA Astronaut 54 Mission Specialists 54 astronaut 53 Buzz Aldrin 52 Julie Payette 51 Piers Sellers 51 Apollo astronauts 51 Edwin Buzz Aldrin 51 astronaut Julie Payette 50 Ron Garan 49 Cernan 49 Oleg Skripochka 48 Commander Eileen 48 Astronaut Buzz Aldrin 47 ISS Expedition 47 crewmates 47 Roberto Vittori 47 Astronaut 46 Kenneth Bowersox 46 Tim Kopra 46 Soviet cosmonaut Yuri Gagarin 45 Sandra Magnus 45 orbited Earth 45 lunar module 45 astronauts 45 Timothy Kopra 45 Fyodor Yurchikhin 45 Japanese astronaut Soichi 45 Leland Melvin 45 Alexander Kaleri 45 Gorie 44 Russian cosmonaut Gennady Padalka 44 Koichi Wakata 44 Andrew Feustel 44 ESA astronaut 44 Wernher von Braun 44 Cady Coleman 44 Retired Maj. Gen. 44 astronaut Peggy Whitson 44 Arctic explorer 44 administrator Sean O'Keefe 43 Paolo Nespoli 43 Lee Archambault 43 Jonathan Frakes 43 Apollo missions 43 Mercury Gemini 43 Navy rear admiral 43 NEEMO 43 Dara O'Briain 42 Rex Walheim 42 Jimmy Doolittle 42 Doug Wheelock 42 NASA astronaut corps 42 Professor Stephen Hawking 42 Lunar Module 42 Russian Gennady Padalka 42 Aldrin 42 NASA Kepler 42 Neil Armstrong 42 Nicole Stott 42 Sergei Volkov 42 Navy aviator 42 Mars Pathfinder 41 Naval Academy graduate 41 Shuttle astronauts 41 Human Spaceflight 41 lunar rover 41 Soyuz capsule carrying 41 NASA 41 Skylab 41 Sir Ranulph Fiennes 41 Nie Haisheng 41 Eric Boe 41 Frank De Winne 41 Retired Lt. Gen. 41 Coast Guard Commandant Adm. 41 spaceship 41 Leroy Chiao 41 crewmate 41 Richard Linnehan 41 fighter pilot 41 tourist Charles Simonyi 41 astronaut Yang Liwei 41 De Winne 41 VSS Enterprise 41 Brent Spiner 40 NASAs 40 Mikhail Kornienko 40 Tony Antonelli 40 Scott Parazynski 40 June Scobee Rodgers 40 Bob Thirsk 40 Dan Tani 40 lunar landing 40 Sturckow 40 teacher Christa McAuliffe 40 Japanese astronaut Koichi 40 unmanned spacecraft