Related by context. Frequent words. (Click for all words.) 58 External Tank 56 thruster 51 liquid hydrogen 51 pressurization 51 Discovery liftoff 50 orbiter 50 shuttle thermal tiles 49 resistant tiles 49 malfunction 49 Lyndin 49 tin whiskers 49 overpressure 49 wiring harness 49 spacecraft 48 cryogenic engine 48 depressurized 48 Gerstenmaier 48 gaseous hydrogen 48 combustor 48 liftoff 48 STS 48 solenoid 48 Ares IX 48 actuator 47 calibration 47 malfunctions 47 tank foam insulation 47 Space Shuttle Program 47 Orbiter 47 horizontal stabilizer 47 depressurization 47 Suffredini 47 overvoltage 46 output voltage 46 fuel injector 46 flange 46 EVAs 46 shuttle Discovery 46 space shuttle Discovery 46 aileron 46 valve 46 GOCE 46 Readdy 46 intake valve 45 ZA# 45 STOVL 45 propellant 45 blown fuse 45 NASA 45 Kaleri 45 isomerization unit 45 thrust reverser 45 shuttle 45 unplanned shutdown 45 exhaust valve 45 heat shield 45 airbag deployment 45 orbit insertion 45 SSME 44 hydrazine 44 spacewalk 44 Taurus XL rocket 44 Elektron 44 shuttle Atlantis 44 delamination 44 setpoint 44 Automated Transfer Vehicle 44 liquid oxygen 44 hydraulic pump 44 module 44 Flight Readiness 44 propulsion 44 outgassing 44 Spacewalk 44 spokesman Allard Beutel 44 Soyuz 44 mechanical failures 43 Shuttle 43 Hubble servicing 43 Oleg Kononenko 43 actuation 43 EVA 43 Orion spacecraft 43 Space Shuttle 43 spokesman Valery Lyndin 43 solid rocket boosters 43 sensor 43 pad #A 43 initialization 43 calibrations 43 oxidizer 43 mechanical 43 hydraulic leak 43 space shuttle 43 LOX 43 orbital 43 Atlas V 43 AEHF 42 thermal tiles 42 pedal entrapment 42 Orbiting Carbon Observatory