Related by context. Frequent words. (Click for all words.) 77 Columbia disintegrated 60 Space Shuttle Columbia 59 space shuttle 58 orbiter 56 liftoff 56 spacecraft 54 astronauts aboard 53 shuttle Discovery 52 Challenger exploded 52 heat shield 52 Space Shuttle Discovery 52 astronauts 51 space shuttle Discovery 51 atmospheric gases 51 Soyuz capsule 50 Columbia Accident Investigation 50 shuttle fleet 49 Dittemore 49 thermal tiles 49 shuttle 49 Space Shuttle Atlantis 48 Huygens probe 48 Soyuz TMA 48 undocking 48 insulating foam 48 Shuttle Discovery 48 space shuttle Endeavour 48 lunar orbit 47 Rick Husband 47 Huygens 47 Space Shuttle Endeavour 46 Martian atmosphere 46 orbit 46 foam insulation 46 space shuttle Atlantis 46 undocked 46 Space Shuttle 46 reentry 46 Discovery astronauts 45 Soyuz 45 Cape Canaveral Fla. 45 Phoenix lander 45 Baikonur Cosmodrome 45 undock 44 shuttle missions 44 shuttle Atlantis 44 polar orbit 44 thermal tile 44 Ilan Ramon 44 Meridiani Planum 44 Shuttle Atlantis 44 shuttle Endeavour 44 Mission Control 43 booster rockets 43 Deepwater Horizon rig exploded 43 NASA 43 Shuttle Endeavour 43 lander 43 Hubble Space Telescope 43 lunar surface 43 Nasa 43 shuttle astronauts 43 comet 43 Endeavour 43 Chandrayaan 43 Space shuttle Discovery 43 orbiting 43 space shuttles 43 orbiters 42 blastoff 42 LCROSS 42 Phoenix Mars Lander 42 lunar landing 42 Space shuttle Endeavour 42 Red Planet 42 spaceship 41 asteroid 41 Baikonur cosmodrome 41 International Space Station 41 Orbiter 41 impactor 41 Soyuz spacecraft 41 Apollo astronauts 41 disintegrated 41 orbiting laboratory 41 Space shuttle Atlantis 41 Deepwater Horizon exploded 41 Martian surface 40 orbital debris 40 Deepwater Horizon rig 40 flyby 40 orbital 40 booster rocket 40 thrusters 40 orbited 40 National Aeronautics 40 manned spacecraft 40 Saturn moon 40 Endeavour astronauts 40 superheated 40 lunar module