Related by context. Frequent words. (Click for all words.) 44 spacewalking 42 Endeavour astronauts 42 Grunsfeld 41 Discovery astronauts 41 Space shuttle Discovery 41 Atlantis astronauts 40 shuttle astronauts 40 Hubble telescope 40 spacewalker 40 Shuttle Discovery 40 spacewalking astronauts 40 Hubble 40 spacewalkers 39 space shuttle Discovery 39 orbiting 38 Hubble Space Telescope 38 Astronauts 38 Space shuttle Endeavour 37 Mike Fincke 37 spacewalk 37 shuttle Discovery 37 shuttle Atlantis 37 International Space Station 37 orbit 37 spacewalks 36 Space Shuttle Atlantis 36 John Grunsfeld 36 astronauts 36 crewmates 36 blastoff 35 motion sickness 35 Space shuttle Atlantis 35 space shuttle Endeavour 35 Mark Polansky 35 space shuttle Atlantis 34 shuttle Endeavour 34 Mastracchio 34 Space Shuttle Endeavour 34 undock 34 orbiting outpost 34 Shuttle Endeavour 34 astronauts aboard 34 ammonia tank 34 Space Shuttle Discovery 33 undocking 33 Parazynski 33 Shuttle Atlantis 33 Lopez Alegria 33 astronaut 33 orbital outpost 33 Flight controllers 33 payload bay 33 NASA astronaut 32 Apollo astronauts 32 spacecraft 32 technical glitches 32 lunar orbit 32 balky 32 white knuckle 32 NASA 32 orbital debris 32 liftoff 32 undocked 32 Dextre 32 spacesuits 32 Oleg Kotov 32 Space Station 31 sleepless night 31 Sunita Williams 31 wheeling 31 rovers 31 demons 31 Tracy Caldwell Dyson 31 monumental task 31 Behnken 31 Nasa 31 Huygens 31 Michael Lopez Alegria 31 orbiter 31 space shuttle 31 Astronaut 31 Suffredini 31 adversity 31 aboard Endeavour 30 repair sports hernia 30 Atlantis 30 spaceship 30 emotional rollercoaster 30 robotic arm 30 shuttle 30 thrill 30 Fincke 30 underwater 29 orbiters 29 Wakata 29 unranked 29 challenges 29 Fossum 29 predicaments 29 screw ups 29 obstacles