Related by context. Frequent words. (Click for all words.) 67 spacesuits 61 astronaut 56 International Space Station 56 astronauts 54 spaceship 54 NASA 54 airlock 54 zero gravity 54 spacecraft 53 spacewalk 52 orbiter 52 cosmonaut 51 manned spacecraft 50 Soyuz 50 Astronauts 50 Astronaut 50 space shuttle 50 capsule 49 shuttle Discovery 49 Nasa 49 spacewalking 49 Padalka 48 spacewalkers 48 Mars rover 48 Lopez Alegria 48 spacewalker 48 spacewalking astronauts 48 Soyuz capsule 48 spacewalks 47 shuttle Atlantis 47 NASA astronaut 47 manned spaceflight 47 cosmonauts 47 lunar landing 46 microgravity 46 Soyuz spacecraft 46 orbiting lab 46 lander 46 Space Station 46 space shuttle Discovery 46 orbit 45 Space Agency 45 spaceflight 45 weightlessness 44 Mission Control 44 crewmates 44 shuttle Endeavour 44 Spacewalk 44 rover 44 Space Shuttle 44 Mars Rover 44 ISS 44 Soyuz TMA 44 lunar surface 44 orbiting laboratory 43 Fincke 43 thruster 43 orbiting 43 heat shield 43 Russian cosmonauts 43 space shuttle Atlantis 43 outer space 43 rovers 43 space shuttle Endeavour 43 Spacecraft 42 shuttle missions 42 Space Shuttle Discovery 42 robotic arm 42 Flight Engineer 42 Dextre 42 Discovery astronauts 42 JAXA 42 Baikonur Cosmodrome 41 orbiting outpost 41 manned missions 41 EVA 41 Chamitoff 41 Gagarin 41 Orbiter 41 shuttle astronauts 41 robot 41 astronauts aboard 41 NASA Administrator 41 Buzz Aldrin 41 Parazynski 41 Wakata 41 Hayabusa 40 Space Flight 40 spaceships 40 Chandrayaan 40 payload bay 40 jetpack 40 space shuttles 40 orbiters 40 Neil Armstrong 40 Martian surface 40 Russian Soyuz spacecraft 40 shuttle 39 Hubble telescope 39 Russian Soyuz 39 humanoid robot