Related by context. Frequent words. (Click for all words.) 56 NASA astronaut 54 astronaut 54 space shuttle 54 NASA astronaut corps 53 Soviet cosmonaut Yuri Gagarin 52 astronauts 51 Ron Garan 51 Ilan Ramon 50 Mercury Gemini 50 Mission Specialists 50 shuttle Challenger 50 Russian cosmonaut Yuri Malenchenko 50 Astronaut 49 Oleg Skripochka 49 Christa McAuliffe backup 49 teacher Christa McAuliffe 49 Eugene Cernan 48 Timothy Kopra 48 Alexander Kaleri 48 Skylab 48 Alan Shepard 48 Edwin Buzz Aldrin 48 Piers Sellers 47 orbited Earth 47 Russian Gennady Padalka 47 Kalpana Chawla 46 lunar landings 46 Apollo astronauts 46 lunar module 45 lunar landing 45 Owen Garriott 45 Apollo missions 45 crewmates 45 Tim Kopra 45 astronauts aboard 45 Space Shuttle Columbia 45 Apollo lunar 45 shuttle missions 45 NASA 44 Virts 44 NASA Astronaut 44 Nicole Stott 44 Orion spacecraft 44 Discovery STS 44 crewmate 44 Japanese astronaut Soichi 44 Lunar Module 44 Jeana Yeager 44 NASAs 44 crewmembers aboard 43 Sputnik satellite 43 Bahcall 43 Israeli astronaut Ilan 43 Shuttle astronauts 43 astronaut Leroy Chiao 43 Eileen Collins 43 Japanese astronaut Koichi 43 interplanetary spacecraft 43 Mikhail Kornienko 43 Christa McAuliffe 43 Apollo 43 crewmen aboard 43 Mike Melvill 42 Challenger exploded 42 unpiloted 42 reusable spacecraft 42 Daniel Tani 42 Russian cosmonaut Gennady Padalka 42 Space Shuttle 42 Fyodor Yurchikhin 42 space shuttles 42 aviator Amelia Earhart 42 astronaut corps 42 lunar missions 42 Cernan 42 SpaceX Falcon 9 42 spacecraft 42 Messenger spacecraft 42 space shuttles Endeavour 41 astronaut Peggy Whitson 41 Yuri Gagarin 41 Metcalf Lindenburger 41 Mars Climate Orbiter 41 Jared Leroy Mohler 41 Distinguished Flying Crosses 41 shuttle disintegrated 41 NEEMO 41 manned spacecraft 41 aviator 41 By Gina Gallucci 41 Space Shuttle Challenger 41 unmanned lunar 41 TJ Creamer 41 Mars Pathfinder 41 Launch Vehicle 41 Julie Payette 41 GSLV D3 41 June Scobee Rodgers 41 Dennis Tito 41 Space Shuttle Discovery 41 Tuskegee Airman