Related by context. Frequent words. (Click for all words.) 47 liftoff 46 shuttle Discovery 43 orbiter 43 scramjet 43 spacecraft 42 faulty valve 41 thruster 41 Readdy 41 hydraulic leak 41 shuttle Atlantis 40 space shuttle Discovery 40 Dittemore 40 lunar landing 40 lunar orbiter 40 liquid hydrogen 40 altimeter 40 space shuttle 40 heat shield 39 malfunction 39 Mars rover 39 mechanical failures 39 tank foam insulation 39 pressurization 39 booster rocket 39 Agni III 39 Taepodong 2 39 Columbia Accident Investigation 39 X #A 38 hydrazine 38 Taepodong 38 mechanical malfunction 38 Ares IX 38 Soyuz rocket 38 shuttle Endeavour 38 spacesuit 38 astronaut 38 spaceflight 38 NASA 37 thermal tile 37 Space Shuttle Program 37 Mike Suffredini 37 Safety Bureau ATSB 37 Soyuz capsule 37 thermal tiles 37 depressurization 37 Orion spacecraft 37 Qantas Airbus A# 37 interceptor missile 37 orbiting spacecraft 37 X #B 37 shuttle 37 missile launches 37 intercontinental ballistic missile 37 spacewalk 36 orbital debris 36 lander 36 Phoenix lander 36 malfunctions 36 orbit 36 Nasa 36 Pitots 36 test 36 leak 36 electrical malfunction 35 insulating foam 35 Huygens probe 35 manned spacecraft 35 thrusters 35 Gerstenmaier 35 blastoff 35 orbiting lab 35 astronauts 35 incorrectly 35 electronic throttle 35 Spirit rover 35 faulty 35 gap filler 35 space shuttle Endeavour 35 space shuttle Atlantis 35 airspeed 35 splashdown 35 overheating 35 glitch 34 abnormality 34 uncollectible 34 malfunctioning 34 rocket boosters 34 Shuttle commander 34 malfunctioned 34 shuttle missions 34 detonation 34 NASA Administrator 34 solid rocket boosters 34 thrust reversers 34 unscheduled pit 34 payload 34 Skylab 34 blowout 34 SpaceX 34 Mission Control 34 lunar orbit