Related by context. Frequent words. (Click for all words.) 53 NASA 47 Nasa 47 NASAs 47 space shuttle 46 administrator Sean O'Keefe 46 Hubble servicing 45 orbiting telescope 44 Hubble Space Telescope 44 Scolese 44 interplanetary spacecraft 43 Space Shuttle Program 43 human spaceflight 43 NASA Administrator 43 Hubble Telescope 43 budget 42 space shuttles 42 manned missions 42 Polar Lander 42 administration 41 Ares rocket 41 manned spaceflight 41 Systems Mission Directorate 41 lunar landings 41 spaceflight 41 Hubble telescope 41 NASA Kepler 41 Lunar Prospector 40 shuttle missions 40 budgetary 40 polar orbiting 40 Gravity Probe B 40 Space Shuttle 40 orbiter 40 Hubble 40 JWST 39 Shuttle Discovery 39 Orion spacecraft 39 Sensing Satellite LCROSS 39 lunar exploration 39 nondefense discretionary spending 39 innermost planet 39 NASA Authorization 39 robotic spacecraft 39 Mars orbiter 39 NASA Hubble Space 39 shuttle Atlantis 38 shuttle Discovery 38 shuttle fleet 38 lunar missions 38 Apollo missions 38 Deep Impact mission 38 Columbia Accident Investigation 38 Orbital Space 38 budgeteers 38 NASA ESA Hubble 38 LCROSS mission 38 spaceplane 38 space shuttle Endeavour 38 Rob Nabors 37 PASADENA Calif. NASA 37 Ares IX rocket 37 astronauts 37 Pentagon 37 HiRISE camera 37 orbiters 37 orbiting observatory 37 manned spacecraft 37 OFPP 37 Discovery liftoff 37 Space Shuttle Endeavour 37 reallocations 37 Orion capsule 37 Crew Exploration 37 director Linda Luebbering 37 ion propulsion 37 Space Shuttle Atlantis 37 planetary exploration 37 field Infrared Survey 37 planetary missions 37 F/A-# Raptor 37 shuttle Challenger 37 Michael Kostelnik 37 orbited Earth 36 Cernan 36 International Space Station 36 Chandra X ray 36 Mission Directorate 36 National Aeronautics 36 orbiting Saturn 36 Kepler telescope 36 partisan polarization 36 planetary science 36 shuttle 36 Louis Caldera 36 spacecraft 36 observations 36 Shuttle Atlantis 36 Orion Crew 36 unobligated 36 space shuttle Discovery 36 NPOESS