Related by context. Frequent words. (Click for all words.) 59 lander 59 robot 55 International Space Station 54 spacewalking astronauts 54 spacewalkers 54 rover 54 robotic 53 spacecraft 51 rotary joint 51 Discovery astronauts 51 shuttle astronauts 51 Dextre 50 Kibo 50 orbiter 50 Endeavour astronauts 50 orbiting outpost 49 spacewalk 49 space shuttle Discovery 49 rovers 49 spacewalks 49 gyroscope 49 Mars rover 49 solar arrays 49 astronauts 48 Phoenix Mars Lander 48 truss 48 Martian surface 48 spectrometer 48 shuttle Endeavour 48 Parazynski 47 Space Agency 47 shuttle Atlantis 47 thruster 47 telescope 47 thrusters 47 Orbiter 46 Huygens 46 space shuttle Endeavour 46 shuttle Discovery 46 Atlantis astronauts 46 Astronauts 46 Endeavour 46 Fincke 46 MESSENGER 46 lunar surface 45 orbiting lab 45 microgravity 45 orbiting 45 Mars Exploration 45 Space Station 45 Space Shuttle Discovery 45 orbit 44 Hubble Space Telescope 44 zero gravity 44 astronaut 44 crewmates 44 Red Planet 44 Mars Reconnaissance Orbiter 43 Cape Canaveral Fla. 43 Cassini 43 spacewalking 43 Flight Engineer 43 weightlessness 43 joystick 43 gyroscopes 43 ISS 43 Martian 43 spaceship 43 space shuttle Atlantis 43 heat shield 43 spacesuits 43 orbital 42 spacewalker 42 Mars 42 robots 42 airlock 42 Hubble 42 spacesuit 42 humanoid robot 42 catheter 42 LCROSS 42 NASA Jet Propulsion Laboratory 41 Soyuz capsule 41 forceps 41 Hubble telescope 41 Cassini spacecraft 41 Soyuz 41 Soyuz TMA 41 telescopic 41 Jet Propulsion Laboratory 41 handrail 41 mass spectrometer 41 docking 40 Baikonur cosmodrome 40 gantry 40 girder 40 telescoping 40 ground penetrating radar 40 crane 40 Space shuttle Discovery 40 Space shuttle Endeavour