Related by context. Frequent words. (Click for all words.) 48 Discovery liftoff 48 Hubble servicing 46 liftoff 45 shuttle missions 45 minimum 44 NASA 43 shuttle 43 spacecraft 43 space shuttle 43 Shuttle Discovery 42 orbiter 42 orbit 42 Nasa 42 shuttle fleet 42 orbiting telescope 42 elliptical orbit 41 blastoff 41 space shuttles 40 spaceflights 40 orbiting complex 40 Shuttle Endeavour 40 sols 40 astronauts 40 space shuttle Discovery 40 Dragon capsule 40 spokesman Allard Beutel 40 circular orbit 39 6 #/#-hour spacewalk 39 orbiters 39 gyroscopes 39 Mike Suffredini 39 shuttle thermal shielding 39 shuttle Atlantis 39 Orion capsule 39 geosynchronous orbit 39 orbital debris 38 Space shuttle Discovery 38 NASA spaceport 38 space shuttle Atlantis 38 Flight Readiness 38 micrometeorite damage 38 Shuttle Atlantis 38 GlobalFlyer 38 polar orbit 38 Earth orbit 38 Atlantis astronauts 38 shuttles 38 shuttle Discovery 38 Space Shuttle 38 heat shield 38 Shuttle Launch 37 lunar orbit 37 tank foam insulation 37 EVAs 37 Endeavour 37 Spacewalk 37 Space Shuttle Program 37 manned spaceflight 37 spokesman Valery Lyndin 37 Hubble telescope 37 spaceflight 37 Grunsfeld 37 interplanetary travel 37 thermal tiles 37 spacecrafts 37 spacewalk 37 LeRoy Cain chairman 37 human spaceflight 36 orbiting shuttle 36 shuttle disintegrated 36 Space shuttle Atlantis 36 orbiting 36 Space shuttle Endeavour 36 Ares rocket 36 spacewalks 36 director Mike Leinbach 36 micrometeorites 36 Soyuz spacecraft 36 Hubble 36 Mark Polansky 36 director Holly Ridings 36 Parazynski 36 JWST 36 orbits 36 Gerstenmaier 36 spacewalkers 36 Lee Archambault 36 reentry 36 undock 35 manned missions 35 orbiting laboratory 35 rotary joint 35 Space Shuttle Discovery 35 manned spacecraft 35 Orion spacecraft 35 Dittemore 35 orbiting observatory 35 Readdy 35 geostationary orbit 35 lunar missions 35 minimums