Related by context. Frequent words. (Click for all words.) 46 zero gravity 44 orbiting complex 42 spacewalking astronauts 41 spaceflights 40 crewmate 39 astronaut 39 weightlessness 38 spacewalk 38 microgravity 38 spacesuit 38 weightless 38 astronauts 37 spacewalks 37 orbiting outpost 37 robotic arm 37 Mission Specialists 36 orbital outpost 36 Shuttle commander 36 NASA astronaut 36 spacewalker 36 Christer Fuglesang 36 spacewalkers 36 NASA Astronaut 36 shuttle missions 36 orbit 36 spaceflight 35 Nicole Stott 35 Soichi Noguchi 35 orbiting lab 35 spaceman 35 orbiting laboratory 35 Daniel Tani 35 Astronauts 35 Lee Archambault 35 Padalka 35 Spacewalkers 35 exoskeletons 35 Russian cosmonaut 34 Andrew Feustel 34 Yurchikhin 34 Flight Engineer 34 cosmonauts 34 Earth orbit 34 commander Rick Sturckow 34 lunar orbit 34 spacewalking 34 shuttle Atlantis 33 spacesuits 33 spacecraft 33 International Space Station 33 Orion spacecraft 33 Endeavour astronauts 33 spaceship 33 Stefanyshyn Piper 33 jetpack 33 robotic 33 lunar module 32 Orion capsule 32 Walheim 32 Russian cosmonauts 32 Kaleri 32 Malenchenko 32 spacecrafts 32 hang glider 32 Lopez Alegria 31 Soyuz rocket 31 astronauts aboard 31 Foale 31 Krikalev 31 space shuttle 31 suborbital flight 31 Wakata 31 manned spacecraft 31 lunar missions 30 sub orbital 30 capsule 30 muscle atrophy 30 polar orbit 30 crewmates 30 Space Shuttle Endeavour 30 Linnehan 30 orbiting 30 curvature 30 Robonaut 30 decompression sickness 30 airlock 30 glider pilot 30 orbital 30 shuttle Discovery 30 geosynchronous orbit 30 Mars rover 30 scramjet 30 cosmonaut 29 JAXA 29 spacemen 29 orbiter 29 space shuttle Endeavour 29 Discovery astronauts 29 aboard Endeavour 29 contraptions 29 Oleg Kotov