Related by context. Frequent words. (Click for all words.) 52 shuttle 51 space shuttle 50 shuttle thermal shielding 49 space shuttle Discovery 49 shuttle missions 48 Shuttle Launch 48 Space Shuttle Discovery 47 liftoff 47 Shuttle Endeavour 47 shuttle Discovery 47 astronauts 46 NASA 46 orbiter 46 micrometeorites 46 orbiters 46 Readdy 46 Bill Gerstenmaier NASA 46 Shuttle Discovery 45 blastoff 45 shuttle Challenger 45 spokesman Allard Beutel 45 daytime 44 Commander Eileen 44 Space Shuttle Atlantis 44 Space shuttle Discovery 44 Russian Soyuz 44 space shuttle Atlantis 44 Gerstenmaier 43 Space Shuttle Endeavour 43 Challenger exploded 43 Shuttle Atlantis 43 Bill Gerstenmaier 43 space shuttles 43 shuttle Atlantis 43 Hobaugh 43 nighttime 43 Endeavour 43 Shuttle astronauts 42 Space shuttle Endeavour 42 orbit 42 shuttle fleet 42 spacecraft 42 Nasa 42 astronauts aboard 42 Soyuz craft 42 director Mike Leinbach 42 spaceflights 42 heat shield 42 shuttle disintegrated 41 Russian Soyuz capsule 41 Soyuz 41 Discovery astronauts 41 orbiting shuttle 41 field Infrared Survey 41 Shuttle commander 41 space shuttle Endeavour 41 Russian Soyuz rocket 41 Christa McAuliffe backup 41 Russian Soyuz spacecraft 41 Shuttle 41 orbiting laboratory 41 Shuttle Landing 41 fiery gases 41 rocketship 41 Lee Archambault 41 spaceflight 41 NASA Administrator 40 commander Peggy Whitson 40 International Space Station 40 shuttles 40 JAXA 40 astronaut 40 commander Rick Sturckow 40 Soyuz capsule 40 Mission Specialists 40 Eileen Collins 40 thermal shielding 40 shuttle astronauts 40 shuttle Endeavour 40 Space shuttle Atlantis 40 Atlantis astronauts 40 spacecrafts 40 tank foam insulation 39 Space Shuttle Columbia 39 orbiting telescope 39 NASA astronaut 39 Space Shuttle 39 Dittemore 39 undocking 39 Roscosmos 39 LeRoy Cain chairman 39 thermal tiles 39 Soyuz rocket 39 NASA Space Shuttle 39 Perminov 39 Rick Husband 39 flybys 38 spaceship 38 Tony Antonelli 38 Astronauts 38 Liftoff