Related by context. Frequent words. (Click for all words.) 62 spacewalks 58 Shuttle astronauts 56 Spacewalking astronauts 55 spacewalk 53 Endeavour astronauts 53 Spacewalkers 53 spacewalkers 52 orbiting complex 52 orbiting outpost 51 Astronauts aboard 51 Discovery astronauts 51 Atlantis astronauts 51 spacewalking astronauts 51 Two spacewalking astronauts 50 Bob Thirsk 49 orbiting laboratory 49 orbital outpost 48 International Space Station 48 shuttle Atlantis 48 truss segment 48 solar arrays 48 Yurchikhin 48 Japan Kibo lab 47 shuttle astronauts 47 shuttle Endeavour 47 spacewalking 47 shuttle Discovery 47 astronauts 46 spacewalking partner 46 ammonia coolant 46 Astronauts 46 Shuttle Discovery 46 Space shuttle Discovery 46 Tracy Caldwell Dyson 46 orbiting telescope 46 flybys 46 Caldwell Dyson 46 space shuttle Discovery 46 Heidemarie Stefanyshyn Piper 46 Lee Archambault 45 Christer Fuglesang 45 Hubble Space Telescope 45 orbiting lab 45 Kononenko 45 Soyuz rocket 45 Sandra Magnus 45 Shuttle Endeavour 45 Krikalev 45 Andrew Feustel 45 space shuttle Endeavour 45 aboard Endeavour 45 Hubble servicing 45 shuttle missions 45 Nicole Stott 45 shuttle robotic arm 45 Robert Behnken 44 Space Shuttle Endeavour 44 Chamitoff 44 robotic arm 44 Lopez Alegria 44 astronauts aboard 44 Discovery payload bay 44 spacecraft 44 Mission Specialists 44 Padalka 43 Harmony module 43 weeks SailingOne 43 ammonia tank 43 Daniel Tani 43 Wakata 43 Malenchenko 43 liftoff 43 orbiting 43 Space shuttle Atlantis 42 thrusters 42 Rick Mastracchio 42 space shuttle Atlantis 42 Gregory Chamitoff 42 Shenzhou VII 42 Space Shuttle Atlantis 42 Curbeam 42 Zamka 42 Thomas Reiter 42 Scott Parazynski 42 Space Shuttle Discovery 42 Soichi Noguchi 42 Space shuttle Endeavour 42 Hubble 42 Sturckow 42 flyby 42 thruster 42 experiments 42 Mike Fincke 42 cryogenic engine 42 NASA Hubble Space 42 payload bay 41 Alpha Magnetic Spectrometer 41 rover Opportunity 41 Shuttle Atlantis 41 shuttle payload bay 41 Cassini orbiter