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(Click for frequent words.) 65 Cassini ultraviolet 55 STIS 55 Infrared Array Camera 54 Advanced Camera 52 spectrograph 51 Cosmic Origins Spectrograph 51 orbiting Chandra 51 Mars Color Imager 51 Diviner instrument 50 Evolution Explorer 50 Composite Infrared Spectrometer 50 infrared astronomy 50 Cosmic Origins Spectrograph COS 50 ESO VLT 50 ESA XMM Newton 50 interplanetary spacecraft 50 HUDF 50 reflector telescope 49 Hubble gyroscopes 49 laser altimeter 49 microshutters 49 Planetary Camera 2 49 Near Infrared Camera 49 Hubble Space Telescope HST 48 Nasa Mars Reconnaissance 48 ROSAT 48 retroreflector 48 Mars Reconnaissance Orbiter MRO 48 IBEX spacecraft 48 Explorer WISE 48 Geminga 48 WISE infrared 48 RHESSI 48 Mars CRISM 48 splitting spectrograph 48 spacecraft orbiting 47 APXS 47 Mini Thermal Emission 47 Mössbauer 47 VIRTIS 47 Mars Odyssey spacecraft 47 deorbiting 47 gamma ray observatory 47 Surveys ACS 47 NASA Cassini spacecraft 47 AB Aurigae 47 Nasa spacecraft 47 Multi Object Spectrometer 47 GALEX 47 NASA Far Ultraviolet 47 Fermi telescope 47 Reflection Radiometer 46 AKARI 46 ray Space Telescope 46 X ray observatory 46 Lunar Reconnaissance Orbiter Camera 46 Mars Orbiter Camera 46 X ray telescopes 46 ESA Planck 46 rover panoramic 46 HiRISE camera 46 ESA Herschel 46 WFC3 46 RXTE 46 Gravitational lensing 46 NASA twin STEREO 46 Context Camera 46 LROC 46 WMAP satellite 46 Mastcam 46 NIRSpec 46 Starfire Optical Range 46 Descent Imager Spectral Radiometer 46 THEMIS spacecraft 46 High Resolution Imaging 46 WISE telescope 46 planetary Transits 46 balky bolt astronauts 45 Adaptive optics 45 Spectroscopic Explorer 45 Galileo spacecraft 45 spectrometer 45 batteries gyroscopes 45 Space Telescope Imaging Spectrograph 45 Hubble Telescope 45 inch refractor telescope 45 Galaxy Evolution 45 inch Schmidt Cassegrain 45 Moderate Resolution Imaging 45 MARSIS radar 45 infrared telescope 45 THEMIS satellites 45 robotic Canadarm 45 Cosmic Microwave Background 45 HiRISE camera aboard 45 Gazarik 45 orbiting gamma ray 45 Planck telescope 45 spectrographs 45 Adam Riess 45 WISE spacecraft 45 orbiting observatory 45 Hubble 45 Hubble telescope 45 NASA Wilkinson Microwave 45 DISR 45 XMM Newton 45 infrared telescopes 45 moon Io 44 Hubble Near Infrared 44 NASA Interstellar Boundary 44 telescopic camera 44 FORCAST 44 Thermal Emission Spectrometer 44 Field Planetary Camera 44 visit http:/saturn.jpl.nasa.gov 44 Keck Interferometer 44 HRSC 44 Hubble Space Telescope 44 orbiting spacecraft 44 periodic dimming 44 Multi Object Spectrograph 44 Nasa Mars Odyssey 44 Heterodyne Instrument 44 Hubbles 44 Cryosat 44 flyby spacecraft 44 Huygens mission 44 Ulysses spacecraft 44 asteroid Eros 44 Mars landers 44 Wilkinson Microwave Anisotropy Probe 44 Voyager spacecraft 44 stellar occultation 44 Viking landers 44 Planck satellite 44 NASA STEREO 44 Clementine spacecraft 44 Spitzer infrared spectrograph 43 Mars Orbiter 43 telescope 43 Earth orbiting satellites 43 Pancam 43 moons orbiting 43 imaging spectrometer 43 orbiting Hubble Space Telescope 43 Express orbiter 43 Epsilon Eridani 43 X ray telescope 43 distant supernovae 43 Upsilon Andromedae b 43 Jet Propulsion Laboratory JPL 43 microlensing events 43 Orbiter MRO 43 discover Fomalhaut 43 orbiting Hubble telescope 43 Telescope BAT 43 martian landscape 43 SN #A 43 Anisotropy Probe WMAP 43 Magnetospheric 43 XMM Newton satellite 43 inch Samuel Oschin 43 LORRI 43 NASAs 43 THEMIS 43 WFPC2 43 NASA Cassini orbiter 43 Bug Nebula 43 Mini TES 43 Cosmic Evolution 43 Krimigis 43 Planetary Transits 43 Reconnaissance Orbiter 43 orbiting telescope 43 Observatory SDO 42 Rosetta orbiter 42 Viking orbiters 42 SIRTF 42 NASA Cassini 42 Resolution Stereo Camera 42 Webb Telescope 42 Planetary Fourier Spectrometer PFS 42 NASA Voyager spacecraft 42 Global Surveyor 42 Herschel telescope 42 Lunar Prospector 42 inch refractor 42 astrometric 42 ESA Integral 42 exoplanets planets 42 Spacewalking 42 SPIRE instrument 42 UKIRT 42 starboard SARJ 42 Cassini Huygens 42 spacecraft 42 detect gravitational waves 42 NASA EPOXI mission 42 Burst Alert 42 NASA THEMIS 42 orbiter robotic arm 42 Relations Observatory STEREO 42 astrometry 42 Martian rovers 42 O OREOS 42 telescopic observations 42 Dalcanton 42 Infrared Astronomical Satellite 42 Cygnus Lyra region 42 Saturnian moon Titan 41 SOHO spacecraft 41 Lunar Orbiter 41 Applied Physics Laboratory 41 orbiting telescopes 41 MG J# +# 41 Mars Pathfinder lander 41 Deep Impact flyby spacecraft 41 Commander George Zamka 41 Sojourner Rover 41 lander 41 celestial observations 41 UCO Lick 41 NASA Mars Odyssey 41 NOAA GOES 41 Curiosity rover 41 Solar TErrestrial RElations Observatory 41 ESA SMART 41 orbiter 41 Red Rectangle 41 HiRise camera 41 DEIMOS 41 Sojourner rover 41 Ocean Salinity SMOS 41 Viking Orbiter 41 Resolution Imaging 41 Saturn rings 41 Keck Observatory 41 Orbiter LRO 41 Cassini 41 Great Observatories 41 voyage Grunsfeld 41 ultraviolet spectrograph 41 EPOCh 41 NASA Chandra 41 geosynchronous satellites 41 Konacki 40 Imaging Spectrograph 40 Gravity Probe 40 spectroscopic observations 40 NASA Fermi Gamma 40 WM Keck Observatory 40 Foton M2 40 exo planet 40 Palomar Observatory 40 orbiting observatories 40 spiral galaxy NGC 40 WMAP 40 http:/www.nasa.gov/cassini 40 Rosetta lander 40 Hubble Space telescope 40 STScI 40 Gerhard Schwehm 40 stabilizing gyroscopes 40 orbiting Mars 40 Kepler Mission 40 NICMOS 40 Spacewatch 40 Convection Rotation 40 cosmic ray detector 40 http:/saturn.jpl.nasa.gov 40 NASA Cosmic Background 40 ESO Paranal Observatory 40 comet nucleus 40 astrophysical phenomena 40 optical telescopes 40 X ray Observatory 40 Mars lander 40 SMOS 40 Landsat satellites 40 STEREO spacecraft 40 Infrared Pathfinder Satellite 40 infrared observatory 40 Solar Dynamics Observatory 40 Hubble Space 40 ESA Proba 40 Ring Nebula 40 moons Phobos 40 orbital solitude 40 YES2 40 Permanent Multipurpose Module 40 Infrared Telescope Facility 40 spacecraft Cassini 40 LRO spacecraft 40 Tropical Rainfall Measuring 40 Huygens lander 40 Mars orbiter 40 Keck telescopes 40 NuSTAR 40 Arecibo Observatory 40 infrared wavelengths 40 Nasa Kepler 40 Fomalhaut b 40 exoplanetary 39 microscopic imager 39 extrasolar 39 Solar Terrestrial Relations 39 radial velocity 39 Landsat satellite 39 lunar orbits 39 Mars Spirit rover 39 astronomical telescope 39 Kibo module 39 Ceccacci 39 Hubble observations 39 Mars Surveyor 39 NASA ICESat 39 revolutionized astronomy 39 spiral galaxy Messier 39 comet Boethin 39 OGLE TR #b 39 Huygens 39 SpaceWeather.com 39 HiRISE image 39 Rick Linnehan 39 fainter objects 39 Phoenix lander 39 asteroid Steins 39 exo planets 39 rover Curiosity 39 Upsilon Andromedae 39 galaxy M# [001] 39 CAPE CANAVERAL Astronauts 39 Telescope 39 shuttle robotic arm 39 millisecond pulsar 39 MARSIS 39 N. Rathnasree 39 NASA Hubble Space 39 Haehnelt 39 Science Experiment HiRISE 39 telescopes astronomers 39 Pilot George Zamka 39 Orbiting Carbon Observatory OCO 39 Spacewalkers 39 MESSENGER 39 SSRMS Space Station 39 Mars Opportunity rover 39 smallest exoplanets 39 telescopes 39 Flyby spacecraft 39 Spitzer Space Telescope 39 STEREO 39 HD#b 39 Heliospheric Observatory SOHO 39 Grunsfeld 38 cosmic ray 38 Nasa Jet Propulsion 38 adaptive optics 38 Cometary 38 Fermi Gamma ray 38 Greenbelt Md. manages 38 Microscopic Imager 38 Comet #P/Holmes 38 astronomical objects 38 orbited Jupiter 38 Cassini flyby 38 Comet Machholz 38 microlensing 38 LCLS 38 electric ion propulsion 38 NASA ESA Hubble 38 Mars Global Surveyor 38 HiRISE 38 NASA Spirit rover 38 NASA Mars Reconnaissance 38 amateur skywatchers 38 NASA Goddard 38 gaseous planet 38 MESSENGER spacecraft 38 orbiters 38 Mars Odyssey 38 Laser Interferometer Gravitational Wave 38 robotic lander 38 GeneSat 1 38 Mars Pathfinder 38 faulty gyroscope 38 Comet Churyumov Gerasimenko 38 Martian surface 38 George Zamka 38 NanoSail D 38 NASA Stratospheric Observatory 38 windshield wiper maneuver 38 Solar Orbiter 38 Saturn Cassini 38 Philae lander 38 ISS robotic arm 38 Orbiter 38 CRISM 38 JWST 38 Spacewalker 38 GROND 38 NASA Solar Terrestrial 38 Space Telescope 38 ship thermal shielding 38 NASA Orbiting Carbon 38 comet flyby 38 Space Telescope Science 38 origins spectrograph 38 Resourcesat 2 38 KAGUYA 38 NASA Stardust spacecraft 38 Observatory STEREO 38 Wolszczan 38 NEOWISE 38 Deep Impact probe 37 Facility SIRTF 37 e MERLIN 37 Mars moon Phobos 37 LCROSS spacecraft 37 OBSS 37 Chodas 37 Saturn Enceladus 37 NASA Lunar Crater 37 planetary missions 37 protruding strips 37 scientist Carolyn Porco 37 Charon Pluto 37 NASA Great Observatories 37 Atlantis robotic arm 37 Cosmic Background Explorer 37 Planck 37 budging Wheelock told 37 LRO 37 Cassini Huygens spacecraft 37 transiting planets 37 NASA Jet Propulsion Lab 37 interacting galaxies 37 NASA Lunar Reconnaissance 37 Lunokhod 37 Epsilon Aurigae 37 Mercury flyby 37 Apollo missions 37 flyby Cassini 37 rovers Spirit 37 Herschel Space 37 Hipparcos 37 NASA MESSENGER spacecraft 37 sized planets orbiting 37 XMM Newton X ray 37 astronomers 37 Huygens Probe 37 urine recycler 37 highly elliptical orbits 37 Interstellar Boundary Explorer 37 astronaut Scott Parazynski 37 Cassini spacecraft 37 shuttle orbiter 37 Comet Hartley 2 37 optical telescope 37 Mars Reconnaissance Orbiter 37 distant galaxies 37 heavily cratered 37 Martian rover 37 icy moons 37 THEMIS Images 37 Lowell Observatory 37 Nasa 37 Ranging MESSENGER spacecraft 37 Huchra 37 LIGO 37 cosmic cannibal 37 NASA Jet Propulsion Laboratory 37 comet Hale Bopp 36 NASA 36 Voyager probes 36 Dynamics Observatory 36 sunlike star 36 Preston Burch 36 Exoplanet 36 NASA LCROSS 36 Spitzer Space Telescopes 36 ExoMars rover 36 Lunar Reconnaissance Orbiter LRO 36 ion propulsion 36 P/# A2 36 Comet Halley 36 Earthlike planets 36 Craig Tooley LRO 36 C1XS 36 SIM PlanetQuest 36 Gamma ray Large 36 Ralph McNutt 36 Ray Villard 36 martian surface 36 Giovanni Cassini 36 SARJ 36 exalted Hubble Space 36 Shuttle Atlantis blasts 36 KODAK CCD Image Sensors 36 Spacewalking astronauts 36 Chang'eI 36 Mauna Kea Hawaii 36 Polar Lander 36 ESA Mars 36 Lunar Surface 36 Rich Zurek 36 Rosetta spacecraft 36 NASA rovers 36 Hubble Ultra 36 heat shield 36 orbiting 36 Kepler spacecraft 36 New Horizons spacecraft 36 planets circling 36 planet Gliese #g 36 cometary 36 exoplanets orbiting 36 GLAST telescope 36 orbit insertion 36 Scott Parazynski 36 Eagle Nebula 36 Orbiting Carbon Observatory 36 Ultraviolet Imaging Spectrograph 36 orbiting satellites 36 Comet Hartley 36 Lunar Orbiter Image 36 Cancri e 36 Mars Phobos 36 ESA GOCE 36 occultations 36 Hinode 36 hubble 36 panoramic camera 36 NASA Gamma ray 36 Huygens probe 36 Fincke radioed 36 Andromeda galaxy 36 Opportunity rovers 36 Helios 2B 36 Resourcesat 35 EPOXI mission 35 SuitSat 35 DIXI 35 NASA MESSENGER 35 orbital observatory 35 FASTSAT 35 Space Telescope GLAST 35 Large Binocular Telescope 35 Lunar Module Pilot 35 NASA Kepler 35 ATST 35 Proxima Centauri 35 Atlantis undocks 35 Viking Lander 35 Churyumov Gerasimenko 35 Mars rover 35 equatorial orbit 35 Kepler Space Telescope 35 Mars Polar Lander 35 Space Agency 35 LSST 35 Comet Holmes 35 Hyakutake 35 Mars orbiting spacecraft 35 Space Infrared Telescope 35 orbital debris 35 Servicing Mission 35 Saturnian system 35 QuikSCAT 35 twin rovers 35 ESOC 35 Martian orbit 35 Martian crater 35 spacewalkers Scott Parazynski 35 Mars Lander 35 robotic rover 35 CoRoT satellite 35 lunar landers 35 Deep Impact comet 35 orbiting ISS 35 GOES satellites 35 Discovery undocks 35 STEREO mission 35 shuttle Discovery STS 35 Mimas 35 Allan Cheuvront 35 Corot 7b 35 PASADENA Calif. NASA 35 Pan STARRS 35 ESA Rosetta 35 Mirelson 35 Atlantis astronauts 35 A'Hearn 35 SSMEs 35 comet Churyumov Gerasimenko 34 defective gyroscope 34 solar flares 34 Earth Asteroid 34 meteoroid 34 Mars orbiters 34 COROT 34 satellites 34 Ron Garan 34 Kuiper belt object 34 Solar System 34 Commander Charlie Hobaugh 34 Boethin 34 GRB #B 34 celestial objects 34 CALIPSO 34 Astro E2 34 BP Psc 34 robotic explorer 34 spokesman Michael Braukus 34 robotic rovers 34 Jenniskens 34 Slooh 34 NASA Mars rover 34 Messenger spacecraft 34 irregularly shaped asteroid 34 Kepler telescope 34 distant galaxy 34 Planck spacecraft 34 Neil Gehrels 34 #P/Holmes 34 Tim Kopra 34 Spirit Mars rover 34 twin rover Opportunity 34 Solar Dynamics 34 Martian rocks 34 polar orbiting satellites 34 Zeta Ophiuchi 34 Dean Pesnell 34 Ringed Planet 34 John Grunsfeld 34 NASA twin rovers 34 GOCE satellite 34 extrasolar planets 34 Mars rovers 34 gamma ray burst 34 LCROSS 34 Stardust capsule 34 Gravity Probe B 34 Atlantis Undocks From 34 Cassini Huygens Mission 34 GOES O 34 JPL 33 Johns Hopkins Applied Physics 33 GLAST 33 Rick Mastracchio 33 scientist Anthony Colaprete 33 Kuiper Belt object 33 Europa Orbiter 33 unmanned spacecraft 33 KBOs 33 NASAâ € ™ 33 Herschel Planck 33 robotic spacecraft 33 NASA Spacecraft 33 Proba 2 33 BepiColombo 33 rovers 33 mySKY 33 rover 33 Goddard Space Flight 33 Nuclear Spectroscopic Telescope Array 33 LRO LCROSS 33 Manned missions 33 Jean Pierre Lebreton 33 Deep Impact eXtended Investigation 33 Interior Laboratory GRAIL 33 Spacesuits 33 NASA Deep Impact 33 TanDEM X 33 extrasolar planet 33 satellites orbiting Earth 33 CloudSat 33 Saturn moons 33 Antenna LISA 33 Martian landscape 33 GOCE 33 Parazynski 33 planet Uranus 33 observatory 33 probe Huygens 33 Enceladus flybys 33 slender crescent 33 Hayabusa probe 33 Butterfly Nebula 33 unmanned probes 33 Jet Propulsion Laboratory 33 Deep Impact mission 33 spacewalks astronauts 33 NASA Kepler spacecraft 33 Mike Suffredini 33 moon Phobos 33 Ranging spacecraft 33 RazakSAT 33 comet 33 Phobos 33 Shuttle Docks 33 Itokawa asteroid 33 Gerstenmaier 33 Hale Bopp 33 Space Interferometry Mission 33 orbiting complex 33 Grammier 33 Emily Lakdawalla 33 Pasachoff 32 Orbital Express 32 Spaceguard 32 Terrestrial Planet Finder 32 Herschel Space Telescope 32 supernovae 32 Jovian moons 32 Hubble orbits 32 Kuiper Belt Object 32 Mars rover Opportunity 32 unscheduled spacewalk 32 Ares IX rocket 32 spacecrafts 32 twin Voyager spacecraft 32 Charles Elachi 32 Bernhard Fleck 32 hsmith@reviewjournal.com 32 lunar surface 32 ISS 32 Shuttle astronauts 32 Discovery astronauts 32 NASA Kepler telescope 32 orbital insertion 32 WASP #b 32 Jupiter Icy Moons Orbiter 32 Lunar Reconnaissance Orbiter 32 reconnaissance orbiter 32 spacewalkers 32 Mars rover Spirit 32 Krikalev 32 Flyby 32 Kepler 32 supernova explosion 32 Ed Weiler NASA 32 SkyCenter 32 Orbiters 32 collider 32 Stardust NExT mission 32 Steins asteroid 32 inhabitable planets 32 Compton Gamma Ray 32 space shuttle Discovery 32 Titan flyby 32 flyby 32 Stardust spacecraft 32 Orion Nebula 32 DART spacecraft 32 Enceladus 32 Jean Pierre Lebreton ESA 32 comet Hartley 2 32 robotic probes 32 planetary science 31 Opportunity rover 31 Jean Luc Margot 31 impactor 31 Space Shuttle Atlantis 31 planets orbiting sun 31 Jupiter Icy Moons 31 NASA Jet Propulsion 31 Shuttle Orbiter 31 waning gibbous 31 moon Charon 31 rover Spirit 31 Saturn outermost moon 31 space shuttle 31 Saturn moon 31 ICESat 31 Pluto Charon 31 Ed Weiler 31 Gliese #d 31 JDEM 31 Kepler #b 31 SELENE 31 orbiter lander 31 Spirit rover 31 Curbeam 31 orbital rendezvous 31 planet orbiting 31 ringed planet 31 stargazer 31 Frick radioed 31 field Infrared Survey 31 Spaceguard Survey 31 super perigee moon 31 Mars rovers Opportunity 31 Endeavour astronauts 31 Horizons spacecraft 31 Field Infrared Survey 31 Crewmate Tracy Caldwell 31 NASA rovers Spirit 31 Shoemaker Levy 31 JIMO 31 Alpha Magnetic Spectrometer 31 Comet Lulin 31 LADEE 31 orbiting outpost 31 EPOXI 31 planets orbiting 31 Jodrell Bank 31 asteroids Ceres 31 Asteroid Itokawa 31 dexterous robot 30 aboard Atlantis 30 Tempel 1 30 Discovery STS 30 Mario Livio 30 star IM Pegasi 30 orbiting astronauts 30 MetOp 30 Hubble Constant 30 refurbished Hubble Space 30 CryoSat 30 Laser Interferometer Space 30 Epoxi 30 Comet Tempel 1 30 David Southwood ESA 30 OSIRIS REx 30 Eta Carinae 30 Pete Theisinger 30 Plait 30 SkyScout 30 Herschel 30 asteroid Vesta 30 Spacecraft 30 JAXA 30 Webb Space Telescope 30 #P/Churyumov-Gerasimenko 30 GPS satellites 30 gamma ray bursts 30 Robotic Exploration 30 asteroid Itokawa 30 station Skylab 30 LCROSS mission 30 commander George Zamka 30 orbiting Saturn 30 Mars Rover 30 Rathnasree 29 Astronomers 29 orbit 29 Endeavour docked 29 OSIRIS Rex 29 Mars rovers Spirit 29 ESA Huygens 29 shuttle Atlantis 29 Landsat 29 robotic explorers 29 astronauts 29 comets 29 BepiColombo mission 29 Peter Theisinger 29 WISE mapped 29 Pluto Kuiper Belt 29 twin rovers Spirit 29 rover Opportunity 29 SM4 29 Fuk Li Mars 29 orbiting Kepler telescope 29 director Chuck Dovale 29 Ken Bowersox 29 shuttle Discovery 29 MAVEN 29 asteroids 29 Elachi 29 asteroid 29 Astronauts 29 Red Planet 29 Cosmonaut Yuri Gagarin 29 Rex Geveden 29 shuttle 29 Bob Ess 29 Halley comet 29 Chandrayaan II 29 exoplanet 29 Stratospheric Observatory 29 Mission Control 29 flybys 29 celestial object 29 Comet #P/Churyumov-Gerasimenko 29 MErcury Surface Space ENvironment 29 lunar orbiter 29 Hubble Servicing 28 Jupiter flyby 28 lunar orbit 28 Admiral Gehman 28 comet chaser 28 Infrared Astronomy SOFIA 28 Lunar Rover 28 Space Shuttle Discovery 28 space shuttle Atlantis 28 spacewalking astronauts 28 highly elliptical orbit 28 ESA ASI 28 International Space Station 28 ExoMars mission 28 orbits 28 shuttle Atlantis astronauts 28 comet Wild 28 shuttle Endeavour STS 28 spaceship 28 Mars rover Curiosity 28 swingby 28 DubaiSat 1 28 Atlantis rocketed 28 Hubble servicing 28 director Derek Hassmann 28 Canadarm 28 GPS IIF 27 Shenzhou spacecraft 27 planets 27 martian 27 Kepler observatory 27 crewed spacecraft 27 Sample Return 27 Shuttle Atlantis 27 Space Shuttle Endeavor 27 orbital laboratory 27 extravehicular activities 27 shuttle astronauts 27 interplanetary missions 27 asteroid Lutetia 27 shuttle Endeavor 27 Earth asteroids 27 Shuttle Crew 27 Chuck Dovale 27 Chandrayaan 27 orbiting laboratory 27 GPS IIR M 27 outer planets 27 Atlantis STS 27 Tombaugh 27 Squyres 27 spacewalk 27 GEochemistry 27 exoplanets 26 innermost planet 26 Mars Atmosphere 26 NASA Stardust NExT 26 Edwin Hubble 26 Shuttle Endeavor 26 EVAs 26 Stardust NExT 26 decadal survey 26 Mars 26 ExoMars 26 Stardust 26 Mars Exploration 26 Earth 26 Phoenix Mars Lander 25 Mars# 25 space shuttle Endeavour 25 spaceplane 25 moon 25 Space Station 25 lunar explorer 25 Shuttle Discovery 25 Earth orbit 25 Cassini Equinox 25 Lunar Crater 25 Kaguya 25 Space Shuttle 25 shuttle Endeavour 25 aerobraking 25 Shuttle Endeavour 24 Endeavour 24 Ed Weiler associate 24 cosmos 24 Deep Impact spacecraft 24 aboard Skylab 24 space shuttles 24 Lutetia 24 Atlantis 24 manned lunar landing 24 spacewalking 23 habitable planet 23 Space Shuttle Program 23 Deep Impact 23 Hayabusa 23 Magnificent Desolation 23 MN4 22 shuttle missions 22 Rick Grammier 22 NASA Space Shuttle 22 Readdy 22 Astronaut Gregory Chamitoff 21 crewed missions 21 administrator Sean O'Keefe 20 Galileo 19 Pluto 17 shuttle fleet 12 human spaceflight