Related by context. Frequent words. (Click for all words.) 55 Spacewalkers 52 Spacewalking astronauts 52 Shuttle astronauts 50 Heidemarie Stefanyshyn Piper 49 shuttle Discovery 48 space shuttle Discovery 48 NASA 48 Dan Tani 47 Astronauts 47 Astronaut 47 shuttle 47 space shuttle 47 Space shuttle Discovery 47 spacewalker 47 Shuttle Endeavour 46 Tim Kopra 46 spacewalking astronaut 46 Shuttle Atlantis 46 shuttle thermal tiles 46 thermal tile 46 Shuttle Discovery 45 Ares IX rocket 45 orbiter 45 Mike Suffredini 45 astronaut 45 Space Shuttle Discovery 45 spacewalkers 44 NASA Astronaut 44 Koichi Wakata 44 Two spacewalking astronauts 44 shuttle underside 44 Andrew Feustel 44 space shuttle Atlantis 44 Space Shuttle Endeavour 44 Space Shuttle Atlantis 43 Rick Mastracchio 43 shuttle Atlantis 43 resistant tiles 43 Shane Kimbrough 43 NASA astronaut 43 Virts 43 frayed wires 43 International Space Station 43 Soichi Noguchi 43 commander George Zamka 43 Garrett Reisman 43 Piers Sellers 43 Nasa 43 spacewalk 43 Robert Behnken 42 Duct tape 42 shuttle Endeavour 42 Scott Parazynski 42 astronauts 42 Space shuttle Endeavour 42 John Grunsfeld 42 Discovery astronauts 42 orbital debris 41 By Irene Klotz 41 Space shuttle Atlantis 41 Alexander Kaleri 41 Tony Antonelli 41 Atlantis astronauts 41 ISS Expedition 41 Shuttle commander 41 Spacewalk 41 space shuttle Endeavour 41 Discovery STS 41 space shuttles 41 Suffredini 41 Mission Specialists 41 Pad #A 41 Mars Lander 41 spacesuit 40 pad #A 40 Gregory Chamitoff 40 Mastracchio 40 Launch Pad #B 40 Mission Control 40 shuttle Challenger 40 aboard Endeavour 39 By Noel McAdam 39 shuttle astronauts 39 rotted wood 39 Greg Chamitoff 39 Rick Husband 39 Parazynski 39 caulk gun 39 commander Rick Sturckow 39 putty knife 39 Gerstenmaier 39 Endeavour 39 Richard Linnehan 39 Fincke 39 rocket boosters 39 By Tim Hrenchir 39 spacewalking 39 Joan Higginbotham 39 tank foam insulation 39 Fossum 39 faulty heater