Related by context. Frequent words. (Click for all words.) 61 thrusters 54 spacecraft 53 thruster 50 spacewalkers 50 shuttle 49 Discovery astronauts 49 orbiter 49 spacewalk 48 orbit 48 space shuttle 48 gyroscope 48 Yurchikhin 48 space shuttle Atlantis 48 Shuttle astronauts 48 undocking 48 NASA 48 gyroscopes 48 lunar orbit 47 space shuttle Discovery 47 International Space Station 47 Spacewalkers 47 cryogenic engine 46 orbiting 46 Space Shuttle Atlantis 46 astronauts 46 Mike Suffredini 46 Soyuz capsule 46 shuttle Endeavour 46 lunar module 46 Orion spacecraft 46 shuttle Atlantis 46 spacewalking astronauts 45 orbiting satellites 45 undock 45 orbiting outpost 45 shuttle Discovery 45 orbiting complex 45 Atlantis astronauts 45 Spirit rover 45 liftoff 45 Space Shuttle Endeavour 45 shuttle Challenger 45 geosynchronous orbit 44 unmanned spacecraft 44 lander 44 Endeavour astronauts 44 Nasa 44 orbital outpost 44 orbital 44 Lee Archambault 44 spacewalks 44 rocket booster 44 Tracy Caldwell Dyson 44 Daniel Tani 44 Space Shuttle Discovery 44 Spacewalking astronauts 44 spacecrafts 44 Shuttle Atlantis 43 Kononenko 43 Padalka 43 orbiters 43 space shuttle Endeavour 43 Orion capsule 43 undocked 43 Sturckow 43 Mars lander 43 orbiting spacecraft 43 Space Station 43 ammonia coolant 43 Commander Eileen 42 Mars rover Spirit 42 Mars Polar Lander 42 Soyuz rocket 42 robotic spacecraft 42 robotic arm 42 spacesuits 42 scramjet 42 booster rockets 42 GPS satellites 42 spacewalking partner 42 Soyuz craft 42 Soyuz spacecraft 42 Kaleri 42 rocket boosters 42 ISS 42 Rick Mastracchio 42 aboard Endeavour 42 spacewalker 42 truss segment 42 Parazynski 42 shuttle astronauts 42 X #A 42 Space Shuttle 42 orbiting lab 42 shuttle robotic arm 42 astronauts aboard 41 Shuttle Endeavour 41 Flight controllers 41 malfunctioned 41 Mars rover 41 Soyuz