Related by context. Frequent words. (Click for all words.) 70 insulating foam 67 foam insulation 60 heat shield 58 orbiter 56 thermal tiles 55 liftoff 53 foam 52 space shuttle 52 space shuttle Discovery 50 Dittemore 50 shuttle Discovery 49 shuttle 49 Columbia Accident Investigation 48 Columbia disintegrated 47 thermal blanket 47 shuttle Endeavour 47 spacecraft 47 Gerstenmaier 47 space shuttle Atlantis 46 Endeavour 46 booster rockets 45 shuttle missions 45 fuselage 45 NASA 45 shuttle Atlantis 45 Space Shuttle Columbia 44 LCROSS 44 astronauts 44 Space Shuttle Discovery 44 space shuttle Endeavour 44 Space Shuttle Atlantis 43 shuttle fleet 43 Discovery astronauts 43 hydrazine 43 spacewalkers 43 nose cone 42 astronauts aboard 42 booster rocket 42 solid rocket boosters 42 Shuttle Discovery 42 liquid hydrogen 41 space shuttles 41 landing gear 41 Saturn rings 40 Atlantis 40 Shuttle 40 Nasa 40 shuttle astronauts 40 orbiters 40 Space Shuttle 40 spacewalking astronauts 40 Endeavour astronauts 39 Cape Canaveral Fla. 39 Soyuz capsule 39 Orbiter 39 Soyuz 39 undocking 39 ammonia tank 39 International Space Station 39 lander 39 comet 39 Space shuttle Discovery 39 spacewalk 39 Gehman 39 Mission Control 39 Atlantis astronauts 39 debris 38 Sumwalt 38 orbiting 38 thruster 38 asteroid 38 payload bay 37 NASA Administrator 37 spacewalking 37 Hubble Space Telescope 37 Flight controllers 37 orbiting outpost 37 spacesuits 37 impactor 37 rocket booster 37 Hayabusa 37 engine compartment 37 lunar surface 37 containment vessel 36 propellant 36 rotary joint 36 Martian atmosphere 36 Kennedy Space 36 spacesuit 36 Space shuttle Endeavour 36 JAXA 36 Parazynski 36 Rolls Royce Trent 36 heater 36 spaceship 36 liquid oxygen 36 Soyuz TMA 35 director Mike Leinbach 35 manned spacecraft 35 Leinbach 35 Astronauts