Related by context. Frequent words. (Click for all words.) 64 Two spacewalking astronauts 62 Spacewalking astronauts 61 Astronauts aboard 58 shuttle Atlantis 58 Spacewalkers 57 International Space Station 56 Shuttle Discovery 56 orbital outpost 56 Astronauts 56 space shuttle Discovery 55 Space shuttle Endeavour 53 orbiting observatory 53 Shuttle Endeavour 53 spacecraft 53 shuttle Discovery 53 Shuttle astronauts 53 Discovery payload bay 53 spacewalking astronauts 53 Atlantis astronauts 53 space shuttle Endeavour 53 orbiting complex 53 orbiting 52 Space Shuttle Endeavour 52 Space shuttle Discovery 52 Hubble telescope 52 orbiting laboratory 52 shuttle Endeavour 51 Shuttle Atlantis 51 Harmony module 51 Space Shuttle Atlantis 51 astronauts 51 Soyuz rocket 51 space shuttle Atlantis 51 Space shuttle Atlantis 51 Hubble Space Telescope 51 spaceship 51 Hubble 51 Frank De Winne 50 orbiting outpost 50 Tracy Caldwell Dyson 50 Space Shuttle Discovery 50 spacecrafts 50 spacewalkers 50 Endeavour astronauts 50 Discovery astronauts 50 spacewalk 50 astronauts aboard 50 space shuttle 49 Greg Chamitoff 49 NASA 49 Space Agency 49 shuttle payload bay 49 Scott Parazynski 49 Andrew Feustel 49 NASA astronaut 49 shuttle 49 Atlantis 49 BAIKONUR Kazakhstan 49 Rick Mastracchio 49 Soichi Noguchi 49 Endeavour 49 orbiting telescope 49 aboard Endeavour 49 shuttle astronauts 48 astronaut 48 orbit 48 Hubble Telescope 48 Automated Transfer Vehicle 48 Nasa 48 Peggy Whitson 48 Caldwell Dyson 48 spacewalks 48 Robert Behnken 48 Heidemarie Stefanyshyn Piper 48 Space Station 48 commander Peggy Whitson 48 CAPE CANAVERAL Fla. 48 Douglas Wheelock 48 Leroy Chiao 48 PASADENA Calif. NASA 47 Alpha Magnetic Spectrometer 47 Christa McAuliffe backup 47 Zamka 47 Nicole Stott 47 telescope 47 Mike Suffredini 47 robotic spacecraft 47 Soyuz capsule 47 Cassini Huygens 47 Yurchikhin 47 Bob Thirsk 47 Sandra Magnus 47 solar arrays 47 NASA Astronaut 47 Sturckow 47 truss segment 47 Astronaut 47 Kibo lab 47 orbiter 47 Kazakh steppe 46 Baikonur cosmodrome