Related by context. Frequent words. (Click for all words.) 78 Soviet cosmonaut Yuri Gagarin 72 Yuri Gagarin 64 astronaut Yang Liwei 59 Yang Liwei 58 Gagarin 58 Gagarin flight 57 Shenzhou V 57 manned spacecraft 57 Baikonur Kazakhstan 54 Alan Shepard 54 Shenzhou VII 53 Nie Haisheng 53 spaceflights 53 Edwin Buzz Aldrin 53 Ariane rocket 53 astronaut 53 cosmonaut 52 spaceflight 52 Koichi Wakata 52 Sputnik satellite 52 shuttle Challenger 52 Astronauts aboard 52 Soyuz capsule carrying 52 Julie Payette 52 spacecraft 52 Mercury Gemini 52 astronauts 51 Soyuz rocket 51 ESA astronaut 51 Fyodor Yurchikhin 51 Tim Kopra 51 manned spaceflight 51 lunar landing 51 Eyharts 51 NASA astronaut corps 51 space shuttle 51 Dennis Tito 50 SpaceX Falcon 9 50 lunar orbiter 50 Shuttle Discovery 50 Astronaut Buzz Aldrin 50 tourist Charles Simonyi 50 Russian cosmonaut 50 Anousheh Ansari 50 International Space Station 50 spaceplane 50 shuttle Atlantis 50 spaceship 50 orbit 50 suborbital flight 50 New Horizons spacecraft 49 Neil Armstrong 49 robotic spacecraft 49 sub orbital 49 Cernan 49 astronaut Peggy Whitson 49 Yuri Night 49 Hubble servicing 49 Shenzhou VI 49 Space Shuttle Discovery 49 astronaut Daniel Tani 49 Baikonur Cosmodrome 49 Christa McAuliffe backup 49 manned missions 49 Space Station 49 Russian leased Baikonur 48 Stardust spacecraft 48 human spaceflight 48 Discovery STS 48 Skylab 48 Shuttle Endeavour 48 Peggy Whitson 48 Russian Soyuz spacecraft 48 Oleg Skripochka 48 lunar orbit 48 NASA astronaut 48 shuttle Discovery 48 unmanned lunar 48 Soyuz spacecraft 48 Russian cosmonauts 48 Mars Pathfinder 48 Xichang 48 Russian Soyuz rocket 48 Space Shuttle 48 Ares IX rocket 48 administrator Sean O'Keefe 47 Michael Foale 47 cosmonauts 47 Soyuz capsule 47 outer space 47 shuttle missions 47 Apollo astronauts 47 astronaut Sunita Williams 47 Bob Thirsk 47 Cosmonauts 47 Robonaut 2 47 orbiters 47 Laika 47 taikonauts 47 BAIKONUR Kazakhstan 47 spaceman