Related by context. Frequent words. (Click for all words.) 62 spacewalk 61 astronaut 60 spacewalking 60 spacewalkers 58 Parazynski 56 spacewalks 55 astronauts 53 spacewalking astronauts 53 shuttle Discovery 53 Lopez Alegria 53 Fincke 53 Melroy 52 NASA astronaut 52 Atlantis astronauts 51 Astronauts 50 Endeavour astronauts 50 orbiting outpost 50 cosmonaut 50 Grunsfeld 49 International Space Station 49 Padalka 49 shuttle astronauts 49 Fossum 49 shuttle Endeavour 48 spacesuit 48 Wakata 48 orbiter 47 Suffredini 47 Flight Engineer 47 Astronaut 47 shuttle Atlantis 47 Mission Control 47 Discovery astronauts 47 orbital outpost 47 orbiting lab 46 Mike Fincke 46 Space Shuttle Discovery 46 cosmonauts 46 Soyuz capsule 45 NASA 45 space shuttle Discovery 45 spacesuits 45 undocking 45 Russian cosmonaut 45 orbiting laboratory 45 spaceflight 45 space shuttle 45 Endeavour 44 Mark Polansky 44 Spacewalk 44 Russian cosmonauts 44 Chamitoff 44 liftoff 44 space shuttle Endeavour 43 orbit 43 Dextre 43 spacecraft 43 space shuttle Atlantis 43 Nasa 43 rotary joint 43 crewmates 42 robotic arm 42 ISS 42 Gerstenmaier 42 Soyuz 42 Satcher 42 Space Shuttle Atlantis 42 ammonia tank 42 Shuttle Discovery 41 Atlantis 41 manned spaceflight 41 weightlessness 41 Tani 41 JAXA 41 Eileen Collins 41 orbiting 41 Feustel 41 shuttle 41 Space Station 40 astronauts aboard 40 blastoff 40 undock 39 airlock 39 Space Agency 39 shuttle missions 39 heat shield 39 Hubble 39 Kibo 39 LCROSS 39 Flight controllers 39 Polansky 39 Bresnik 38 Hubble telescope 38 manned spacecraft 38 lunar landing 38 NASA Administrator 38 Buzz Aldrin 38 Hubble Space Telescope 38 Space shuttle Discovery 38 human spaceflight 37 Space Shuttle