Related by context. Frequent words. (Click for all words.) 67 spacewalks 57 spacewalk 57 Spacewalking astronauts 57 spacewalkers 56 spacewalking astronauts 55 Shuttle astronauts 54 Discovery astronauts 54 Spacewalkers 54 Atlantis astronauts 53 orbiting complex 51 ammonia coolant 51 Endeavour astronauts 50 Tracy Caldwell Dyson 50 truss segment 50 astronauts 50 Padalka 50 shuttle Atlantis 50 Shuttle Discovery 50 Robert Behnken 50 shuttle missions 49 Caldwell Dyson 49 Yurchikhin 49 astronauts aboard 49 Astronauts 49 weeks SailingOne 49 Christer Fuglesang 49 spacewalking 48 Andrew Feustel 48 ammonia tank 48 Harmony module 48 orbiting outpost 48 space shuttle Discovery 48 Daniel Tani 48 shuttle Discovery 48 shuttle astronauts 47 International Space Station 47 Kaleri 47 Grunsfeld 47 Garrett Reisman 47 Astronauts aboard 47 spacecraft 47 Krikalev 47 flybys 46 orbiting laboratory 46 spacemen 46 Soyuz rocket 46 Mission Specialists 46 orbital outpost 46 Scott Parazynski 46 aboard Endeavour 46 Bob Thirsk 46 shuttle payload bay 46 gyroscopes 45 Rick Mastracchio 45 Nicole Stott 45 Discovery payload bay 45 Space Shuttle Atlantis 45 GOCE 45 Spacewalk 45 Shuttle Endeavour 45 Alpha Magnetic Spectrometer 45 Space shuttle Discovery 45 Fincke 45 Zamka 45 John Grunsfeld 45 orbiting lab 45 Hubble 45 Cassini orbiter 45 airman studied 45 solar arrays 45 Lopez Alegria 45 Automated Transfer Vehicle 44 Mike Fincke 44 SPACE CENTER Houston 44 Fuglesang 44 orbiting spacecraft 44 spacesuits 44 Soyuz capsule 44 orbiting 44 Hubble Space Telescope 44 Sandra Magnus 44 liftoff 44 Shenzhou VII 44 thrusters 44 Space Shuttle Endeavour 44 Russian cosmonauts 44 rotary joint 44 Phoenix lander 44 Oleg Kotov 44 orbiters 44 spacewalking partner 43 Chamitoff 43 Kibo 43 Japan Kibo lab 43 Sturckow 43 Gregory Chamitoff 43 space shuttle Atlantis 43 robotic spacecraft 43 Parazynski 43 Space shuttle Atlantis 43 gyroscope