Related by context. Frequent words. (Click for all words.) 56 Spacewalkers 55 ammonia tank 51 Spacewalking astronauts 50 spacewalking astronauts 50 spacewalkers 49 Andrew Feustel 48 Rick Mastracchio 48 Tracy Caldwell Dyson 48 ammonia coolant 47 gyroscopes 46 spacewalk 46 Astronauts aboard 45 Caldwell Dyson 45 gyroscope 45 balky 44 orbiting complex 44 space shuttle Discovery 44 Shuttle astronauts 44 truss segment 43 Yurchikhin 43 Astronauts 43 spacewalking 43 shuttle payload bay 42 Discovery astronauts 42 thrusters 42 Flight controllers 42 Endeavour astronauts 42 robotic arm 42 Curbeam 42 spacewalks 42 Feustel 42 space shuttle Atlantis 42 Mission Specialists 42 rotary joint 42 shuttle Atlantis 41 shuttle Endeavour 41 Nicole Stott 41 Oleg Kotov 41 shuttle Discovery 41 spacesuits 41 Daniel Tani 41 Krikalev 40 Spirit rover 40 insulation foam 40 thruster 40 shuttle astronauts 40 Mars rover Spirit 40 Harmony module 40 payload bay 40 orbiting outpost 40 orbiting 39 Donald Pettit 39 Mastracchio 39 Douglas Wheelock 39 Elektron 39 undock 39 CAPE CANAVERAL Fla. 39 Automated Transfer Vehicle 39 spacewalking partner 39 Stefanyshyn Piper 39 orbiter 39 SPACE CENTER Houston 39 space shuttle Endeavour 38 Christer Fuglesang 38 astronauts aboard 38 spacewalking astronaut 38 spacesuit 38 undocked 38 Kaleri 38 spacecraft 38 astronaut Paolo Nespoli 38 astronauts 38 International Space Station 38 spacewalker 38 putty knife 38 undocking 38 rewired 38 Christa McAuliffe backup 38 Hubble Space Telescope 38 booster rockets 37 wheeled robot 37 rewiring 37 underwater robot 37 solar arrays 37 rocket boosters 37 shuttle robotic arm 37 spectrograph 37 Robert Behnken 37 Flight Engineer 37 orbiting lab 36 Russian cosmonauts 36 docking port 36 Space Shuttle Atlantis 36 Padalka 36 Cassini orbiter 36 Russian cosmonaut 36 crewmates 36 Dextre 36 Mars rovers 36 Atlantis astronauts 36 rover Opportunity