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(Click for frequent words.) 75 comet Tempel 1 72 comet 71 comet nucleus 66 Comet Tempel 1 61 Stardust spacecraft 61 Deep Impact spacecraft 59 NASA Stardust spacecraft 59 comet Wild 58 impactor 58 Comet Hartley 2 58 Galileo spacecraft 58 Deep Impact craft 58 comet Hartley 2 57 Comet #P/Churyumov-Gerasimenko 57 comet dust 57 LCROSS 57 Comet Hartley 56 asteroid Vesta 56 comets 56 Messenger spacecraft 56 Saturn rings 56 #P/Churyumov-Gerasimenko 56 Comet 9P/Tempel 1 56 NASA Deep Impact 56 cometary 55 Cassini 55 Churyumov Gerasimenko 55 asteroid 55 Martian surface 55 New Horizons spacecraft 55 Cassini spacecraft 54 Martian atmosphere 54 ejecta 54 Deep Impact probe 54 MESSENGER 54 flyby 54 NASA Cassini spacecraft 54 Deep Impact 54 protons 54 flyby spacecraft 54 innermost planet 54 impactor spacecraft 54 Cassini Huygens spacecraft 53 spacecraft 53 meteoroids 53 comet Churyumov Gerasimenko 53 subatomic particles 53 Enceladus 53 Deep Impact comet 53 NASA EPOXI mission 53 Stardust NExT 53 distant galaxies 53 Itokawa 53 Pluto Charon 53 cometary dust 52 interstellar dust 52 planet Uranus 52 Earth magnetosphere 52 orbiting observatory 52 supernova explosion 52 Mars Reconnaissance Orbiter MRO 52 asteroid Itokawa 52 orbiting 52 RQ# 52 interstellar space 52 comet particles 52 Iapetus 51 comet #P/Churyumov-Gerasimenko 51 Gliese #e 51 lunar surface 51 Cassini Huygens 51 LCROSS spacecraft 51 Comet Halley 51 Fomalhaut b 51 comet orbit 51 Voyager spacecraft 51 NASA MESSENGER spacecraft 51 meteoroid 51 Nasa spacecraft 51 WASP #b 51 asteroids 51 outer planets 51 shepherding spacecraft 51 Hubble telescope 51 sunlike star 51 impactors 51 asteroid Steins 51 comet tail 51 Comet Boethin 51 Red Planet 51 planetesimals 51 interstellar particles 51 asteroid Lutetia 51 cosmic collisions 50 perihelion 50 Rosetta spacecraft 50 icy moons 50 moon Io 50 orbiting telescope 50 distant galaxy 50 NEAs 50 Deep Impact mission 50 Opportunity rover 50 protoplanetary disk 50 Hubble 50 EPOXI mission 50 neutron star 50 comet Shoemaker Levy 50 particle beams 50 Cassini flyby 50 Saturn outermost moon 50 protoplanets 50 HiRISE camera 50 Cabeus crater 50 heavily cratered 50 Lunar Reconnaissance Orbiter LRO 50 cometary nucleus 50 Global Surveyor 50 galaxies 50 gamma ray burst 50 copper impactor 50 microscopic imager 50 EPOXI 50 Reconnaissance Orbiter 49 Milky Way galaxy 49 comet McNaught 49 solar corona 49 Martian equator 49 gaseous planet 49 Saturn moons 49 Antennae Galaxies 49 cosmic ray collisions 49 protoplanet 49 NASA Opportunity rover 49 COROT 49 rover Spirit 49 elongated orbit 49 spacecraft Cassini 49 Heliospheric Observatory SOHO 49 P/# A2 49 Martian arctic 49 solar nebula 49 galaxy 49 Saturnian 49 Mars moon Phobos 49 Oort Cloud 49 Comet Lulin 49 EPOXI spacecraft 49 Mars Reconnaissance Orbiter 49 interstellar dust grains 49 Comet Machholz 49 rover Opportunity 49 Saturnian moon Titan 49 spiral galaxy NGC 49 Huygens 49 martian atmosphere 49 Toutatis 49 Mars Orbiter Camera 49 NASA LCROSS 49 YU# 49 NASA Voyager spacecraft 49 Martian rocks 49 Sensing Satellite LCROSS 49 planet orbiting 49 exoplanets orbiting 48 comets asteroids 48 Explorer WISE 48 Andromeda galaxy 48 polar orbit 48 magnetosphere 48 Large Magellanic Cloud 48 planets orbiting 48 Saturn moon 48 ESA Rosetta 48 interstellar medium 48 Lutetia 48 HD#b 48 Martian soil 48 Saturnian system 48 corona 48 quark gluon plasma 48 Jovian moons 48 LORRI 48 icy comets 48 moon Phobos 48 lunar crater 48 Epsilon Eridani 48 Itokawa asteroid 48 NASA Spirit rover 48 orbits 48 Halley comet 48 moon Charon 48 Saturn Cassini 48 Viking Lander 48 proton beams 48 asteroid belt 48 Stardust NExT mission 48 ringed planet 48 positrons 48 cometary debris 48 orbiting Hubble Space Telescope 48 galaxy M# [001] 48 Kepler spacecraft 48 Martian terrain 48 martian surface 48 Epsilon Aurigae 48 lander 48 orbiter 48 WISE spacecraft 48 galactic clusters 48 Zeta Ophiuchi 48 coronal mass ejection 48 coronal loops 48 orbiting spacecraft 48 NASA rovers Spirit 48 star Gliese 48 BP Psc 48 Bullet Cluster 48 elliptical orbits 48 rocky planets 48 neutron stars 48 dwarf galaxies 47 Sensing Satellite 47 Hubble Space Telescope 47 AB Aurigae 47 Interstellar Boundary Explorer 47 planemos 47 highly elliptical orbits 47 Comet Churyumov Gerasimenko 47 MESSENGER spacecraft 47 antimatter particles 47 galactic disk 47 interstellar dust particles 47 WISE telescope 47 Orbiter LRO 47 accretion disk 47 Milky Way Galaxy 47 slender crescent 47 asteroid Eros 47 Solar System 47 Earthlike planet 47 colliding protons 47 Martian crater 47 comet Lulin 47 CoRoT satellite 47 galaxy clusters 47 Saturnian moon 47 Sojourner rover 47 exosphere 47 gravitationally 47 planet HD #b 47 cometary material 47 galaxy cluster 47 coronal mass ejections 47 dwarf galaxy 47 Mars Global Surveyor 47 Isidis Planitia 47 Gravitational lensing 47 APXS 47 distant supernovae 47 planet orbits 47 substorm 47 HiRISE image 47 Andromeda Galaxy 47 Hubble Space telescope 47 Endurance crater 47 Mars orbiter 47 GJ #b [001] 47 martian soil 47 Kuiper belt 47 NASA Cassini 47 moonlet 47 Earth ionosphere 47 circumstellar 47 Solar Dynamics 47 Eta Carinae 47 planets orbits 47 highly elliptical orbit 47 arcsecond 47 DIXI 47 SIRTF 47 heliosphere 47 Phoenix lander 47 unmanned probes 47 galaxy NGC 47 planetoid 47 Mars rover Opportunity 47 Oort cloud 47 rovers Spirit 47 HD #b [001] 46 NASA Mars Reconnaissance 46 cometary particles 46 Lunar Crater Observation 46 Epoxi 46 heliosheath 46 Mars rovers Spirit 46 Corot 7b 46 stellar occultation 46 circumstellar disk 46 HD #b [002] 46 neutrinos 46 Mars 46 IBEX spacecraft 46 lunar orbits 46 HL Tau 46 Saturnian moons 46 atomic particles 46 Spitzer Space Telescope 46 Comet Holmes 46 Saturn moon Iapetus 46 spacecraft flyby 46 exoplanetary 46 asteroids comets 46 GJ#b 46 Virgo Cluster 46 twin rover Spirit 46 moons 46 Shoemaker Levy 46 Saturn moon Enceladus 46 Jupiter flyby 46 atoms 46 Martian dust 46 interstellar grains 46 Kuiper Belt 46 Comet #P 46 Proxima Centauri 46 Comet Tempel Tuttle 46 astronomers 46 Beta Pictoris 46 heliopause 46 Apophis 46 Jupiter magnetosphere 46 WFPC2 46 Ranging spacecraft 46 moons orbiting 46 Solar Dynamics Observatory 46 HiRISE camera aboard 46 GJ #b [002] 46 SN #A 46 Upsilon Andromedae b 46 massless particles 46 unmanned spacecraft 46 planet magnetosphere 46 comets orbiting 46 permanently shadowed 46 Earth asteroid Itokawa 46 ejecta blanket 46 pulsar 46 DISR 46 Stephan Quintet 46 GRB # 46 globular clusters 46 XO 3b 46 gamma rays 46 comet chaser 46 cosmic 46 Ringed Planet 46 robotic explorer 46 Martian landscape 46 Deep Impact eXtended Investigation 46 waxing gibbous moon 46 robotic spacecraft 46 neutrons 46 Mercury flyby 46 brown dwarf 46 photons 46 orbiting Hubble telescope 46 barred spiral galaxy 46 supermassive black hole 46 Titan flyby 46 ultraviolet wavelengths 46 A'Hearn 46 crater Cabeus 46 Hubble Telescope 45 moon Titan 45 STEREO spacecraft 45 arcseconds 45 exoplanets planets 45 Gusev crater 45 Red Rectangle 45 Venusian surface 45 outermost planets 45 planetary embryos 45 observable universe 45 lensing galaxy 45 visible wavelengths 45 Cassini orbiter 45 X ray pulses 45 planetary nebulae 45 Supernova #A 45 CMEs 45 LCROSS mission 45 RS Ophiuchi 45 SN#A 45 SOHO spacecraft 45 Ulysses spacecraft 45 elongated orbits 45 Orion Nebula 45 planets 45 WD5 45 orbiting Mars 45 astronomical objects 45 Stardust capsule 45 NASA rover Opportunity 45 Earth orbit 45 GALEX 45 planet WASP #b 45 HM Cancri 45 mesosphere 45 comet Tempel Tuttle 45 twin Voyager spacecraft 45 lunar equator 45 primordial ingredients 45 X ray emission 45 transiting exoplanet 45 Jupiter moons 45 Galaxy Evolution 45 Apophis asteroid 45 Upsilon Andromedae 45 protons collide 45 O OREOS 45 Stardust 45 NASA Interstellar Boundary 45 Uranus 45 lunar soil 45 Lunar Prospector 45 helium atoms 45 NGC #A 45 robot rovers 45 Mars Odyssey spacecraft 45 Wilkinson Microwave Anisotropy Probe 45 Nasa Deep Impact 45 Comet Hale Bopp 45 GA6 45 extrasolar planet 45 Kuiper belt objects 45 HiRISE 45 volcanic moon Io 45 Deep Impact flyby spacecraft 45 gravitational slingshot 45 photosphere 45 magnetotail 45 coronagraph 45 antiproton 45 Gliese #c 45 Michael A'Hearn 45 Crewmate Tracy Caldwell 45 onrushing comet 45 YORP effect 45 Mars Lander 45 Saturn magnetosphere 45 asteroidal 45 proto galaxies 45 neutrino 45 merging galaxies 45 NASA Lunar Crater 45 quasar 45 galactic 45 distant quasar 45 NASA Lunar Reconnaissance 45 Apollo missions 45 Martian plains 44 planetary nebula 44 faraway galaxies 44 BP Piscium 44 martian 44 interacting galaxies 44 orbital resonance 44 interstellar dust samples 44 NuSTAR 44 subatomic 44 Observatory SDO 44 Centaur rocket 44 Mimas 44 KBOs 44 galaxy M# [002] 44 Milky Way 44 spacetime 44 THEMIS satellites 44 particle beam 44 superfluid 44 NASA rovers 44 PASADENA Calif. NASA 44 Phoebe orbits 44 Comet Shoemaker Levy 44 eccentric orbits 44 exoplanet 44 Solar TErrestrial RElations Observatory 44 Jupiter icy moons 44 Mars Pathfinder 44 cosmos 44 Hubble observations 44 cosmic microwave background 44 rover Spirit landed 44 Mars Odyssey orbiter 44 NASA Hubble Space 44 Galilean moons 44 Grammier 44 cosmic particles 44 COROT 7b 44 NanoSail D 44 outer corona 44 Heliospheric Observatory 44 Sojourner Rover 44 Valles Marineris 44 galactic halo 44 magnetars 44 interstellar 44 Keck Interferometer 44 Wolszczan 44 Manned missions 44 sun corona 44 WMAP satellite 44 lunar 44 orbiting observatories 44 circumstellar disks 44 RHIC 44 Viking landers 44 planets Uranus 44 ejecta plume 44 neighboring Andromeda galaxy 44 Mars Pathfinder lander 44 airglow 44 Trojan asteroids 44 lightwaves 44 MG J# +# 44 Earth 44 extrasolar 44 magnetar 44 tiny meteoroids 44 polar vortex 44 Leonids 44 fainter objects 44 moon Mimas 44 supernovas 44 Martian orbit 44 constellation Cassiopeia 44 Lunokhod 44 swingby 44 X ray photons 44 Crab Nebula 44 Fermi telescope 44 galaxy NGC# 44 NASA STEREO 44 jovian 44 legged lander 44 atomic nuclei 44 colliding galaxies 44 Eta Aquarids 44 supernova explosions 44 twin rover Opportunity 44 micrometeoroids 44 kaons 44 rotational axis 44 aphelion 44 pions 44 constellation Virgo 44 Shackleton crater 44 TU# [002] 44 polar craters 44 Flyby spacecraft 44 Kepler telescope 44 journal Meteoritics 44 infrared wavelengths 44 Voyager probes 44 Mars Orbiter 44 CoRoT 7b 44 Comet McNaught 44 supernova 44 spiral galaxies 44 2 pronounced Vilt 44 Epimetheus 44 Herschel Space Telescope 44 Cosmic Origins Spectrograph 44 orbiters 44 TrES 4 44 craters 44 comet flyby 44 Meridiani plains 44 comet 9P/Tempel 44 Phobos 44 twin rovers 44 navigate autonomously 44 Cabeus 44 Gravitational waves 44 outer layers 43 orbit 43 Bug Nebula 43 celestial object 43 Planck 43 Lunar Reconnaissance Orbiter 43 hypervelocity stars 43 moons Phobos 43 Murchison meteorite 43 cosmic rays 43 impactor probe 43 V# Mon 43 Endurance Crater 43 deuterium atoms 43 Evolution Explorer 43 meteoroid impacts 43 X ray wavelengths 43 NASA Solar Terrestrial 43 earthlike planets 43 martian rocks 43 Mars Phobos 43 sodium atoms 43 star Proxima Centauri 43 ray Space Telescope 43 Orionids 43 retroreflector 43 Earthlings 43 Rover Opportunity 43 solar flares 43 GRBs 43 luminous galaxies 43 gamma ray bursts 43 whiz harmlessly 43 OSIRIS REx 43 Taurids 43 Mini TES 43 landing superheated gases 43 spiral galaxy 43 cosmic ray 43 Descent Imager Spectral Radiometer 43 asteroids orbiting 43 gamma ray observatory 43 ionized gas 43 hydrogen atoms 43 meteorites 43 lunar crust 43 moon Deimos 43 Solar Orbiter 43 sized planets orbiting 43 Earth asteroids 43 Rosetta orbiter 43 galaxy formation 43 Jupiter moon Io 43 constellation Carina 43 Yarkovsky effect 43 comet Boethin 43 stellar occultations 43 occultations 43 infalling 43 Herschel Space 43 nebular 43 KH #D 43 Horizons spacecraft 43 Stardust mothership 43 infrared spectrometer 43 polarimetry 43 geyser plumes 43 HiRISE images 43 exoplanets 43 X ray telescopes 43 albedo reflectivity 43 comet Hale Bopp 43 Wolf Rayet star 43 Stardust zoomed 43 Scheila 43 Meridiani 43 Gamma rays 43 hydroxyl molecules 43 cobalt atom 43 chondritic meteorites 43 nuclei 43 Earth radii 43 X ray observatory 43 Steins asteroid 43 lunar orbit 43 ESA Envisat satellite 43 QQ# 43 rovers 43 reconnaissance orbiter 43 electrons 43 quasars 43 Meridiani Planum 43 shuttlecock shaped capsule 43 globular cluster 43 Tunguska Siberia 43 telescope 43 waning gibbous 43 CoRoT #b 43 Mars Color Imager 43 LRO 43 CoRoT 43 Cassini Equinox 43 moon Ganymede 43 proto planetary disk 43 meteoritic material 43 Type Ia supernova 43 Deep Impact Extended 43 cosmic ray particles 43 Tunguska object 43 constellation Ursa Major 43 cosmological distances 43 gravitational interactions 43 spatially resolved 43 Asteroid 43 coronal mass ejections CMEs 43 Geminid meteor shower 43 moon Enceladus 43 Relations Observatory STEREO 43 exo planets 43 closest flyby 43 gravitationally bound 43 retrograde orbit 43 magnetic reconnection 43 sols 43 spaceward 43 Hubble Space Telescope HST 43 ESA Huygens probe 43 orbital velocity 43 Martian meteorites 43 muon neutrino 43 Victoria Crater 43 Soyuz landings 43 supernova remnant 43 Herschel telescope 43 moon permanently shadowed 43 elliptical galaxy 43 helium atom 43 Enceladus flyby 43 Hayabusa spacecraft 42 smallest exoplanet 42 spacecraft orbiting 42 orbiting Saturn 42 gaseous planets 42 exoplanetary systems 42 Late Heavy Bombardment 42 Cosmic Microwave Background 42 Kepler 9c 42 mu Arae 42 Context Camera 42 millisecond pulsar 42 SN #D 42 electron neutrinos 42 Beta Pictoris b 42 millisecond pulsars 42 Orion nebula 42 SIM PlanetQuest 42 spherules 42 Corot 9b 42 Phoenix Mars Lander 42 Resolution Stereo Camera 42 moon 42 retrograde orbits 42 Omega Centauri 42 Tauri Sb 42 Kuiper belt object 42 Comet #P/Holmes 42 galaxies collide 42 STEREO mission 42 constellation Hercules 42 comet hurtling 42 Mars rovers 42 Helix nebula 42 brown dwarfs 42 supernovae 42 robotic geologist 42 Lunar CRater Observation 42 gamma rays emitted 42 Convection Rotation 42 lunar poles 42 infall 42 circular orbit 42 micrometeorites 42 VIRTIS 42 flybys 42 Japan Hayabusa spacecraft 42 Swift Tuttle 42 Mars Squyres 42 CloudSat 42 sunlike stars 42 flyby Cassini 42 meteor 42 irregularly shaped asteroid 42 protoplanetary 42 field Infrared Survey 42 Bonneville Crater 42 foreground galaxy 42 exoplanet orbiting 42 supermassive black holes 42 lunar perigee 42 planets orbiting distant 42 intrinsic brightness 42 perigee 42 GQ Lupi 42 High Resolution Imaging 42 NASA THEMIS 42 arcminutes 42 laser pulses 42 heatshield 42 Earth magnetotail 42 excitons 42 NASA twin rovers 42 Martian arctic plains 42 copper fortified impactor 42 spacecraft thrusters 42 spectroscopic 42 Express orbiter 42 Cosmic Microwave Background CMB 42 Cassini flybys 42 Rosette Nebula 42 Geminids 42 telescope Uranus 42 lunar meteorites 42 probe Huygens 42 lander Philae 42 planets moons 42 NASA Kepler 42 Triangulum 42 SN #gy 42 terrestrial planets 42 Rover Spirit 42 ultraluminous galaxy 42 spiral galaxy Messier 42 asteroids Ceres 42 ULIRGs 42 bedrock outcropping 42 reentry capsule 42 antihydrogen atoms 42 Earthlike planets 42 stationary lander 42 Kepler #b 42 chondrules 42 infrared telescope 42 Jupiter Uranus 42 filamentary structure 42 HRSC 42 Emily Lakdawalla 42 Charon Pluto 42 imaging spectrometer 42 neutral mass spectrometer 42 accreting 42 icy moon Enceladus 42 krypton atoms 42 Science Experiment HiRISE 42 Saturn moon Mimas 42 AU Mic 42 gravitational waves 42 permanently shadowed craters 42 antiprotons 42 Adam Riess 42 STEREO 42 planet Gliese #g 42 X ray Observatory 42 pericentre 42 Cryosat 42 phyllosilicates 42 radial velocity 42 globulars 42 Martian 42 CALIPSO 42 Jenniskens 42 simulated lunar 42 antineutrinos 42 infrared radiation 42 Odyssey orbiter 42 detect gravitational waves 42 tiniest particles 42 optical wavelengths 42 Kepler Space Telescope 42 Hubbles 42 Comet NEAT 42 # Apophis 42 GeV 42 sister rover Spirit 42 cosmic magnifying glass 42 meteorite fragments 42 laser pulse 42 extrasolar planets 42 Io Europa 42 moon Mab 42 planets circling 42 penumbral shadow 42 particles 42 Spirit Mars rover 42 tiny meteoroid 42 resistant tiles 42 aerobraking 42 distant quasars 42 dust devils 42 electron flux 42 Astronomers 42 orbited Jupiter 42 Krimigis 42 inhabitable planets 42 P Churyumov Gerasimenko 42 WISE infrared 42 Hayabusa probe 42 Planck satellite 42 helium nuclei 42 Wilkinson Microwave Probe 42 Geminid meteors 42 cosmic cannibal 42 planets orbiting sun 42 Comet Elenin 42 carbonaceous chondrite 42 NFIRE satellite 42 microlensing events 42 GRB #B 42 Lagoon Nebula 42 infrared spectrograph 42 muon 42 HIP #b 42 interstellar cloud 42 satellites orbiting Earth 42 interplanetary spacecraft 42 CryoSat satellite 42 MUSES C 41 organic molecules 41 Venusian atmosphere 41 interstellar clouds 41 Boethin 41 hydrogen nuclei 41 unaided eye 41 electron volts 41 http:/saturn.jpl.nasa.gov 41 synchronous orbit 41 planets Kepler 41 Samuel Oschin Telescope 41 planet HD#b 41 proton 41 transiting planet 41 B meson 41 Interior Laboratory GRAIL 41 Pancam 41 ESA ASI 41 Butterfly Nebula 41 HIRES spectrometer 41 superdense 41 X ray binary 41 radioactive decay 41 NASA Kepler telescope 41 astrophysical objects 41 alpha particles 41 geomagnetic field 41 celestial sphere 41 Lunar Orbiter 41 Grillmair 41 lunar orbiter 41 martian landscape 41 Earthlike 41 meteors 41 spectroscopic observations 41 accretion disks 41 Tunguska asteroid 41 protoplanetary disc 41 meteorite 41 constellation Centaurus 41 XMM Newton 41 muons 41 twin rovers Spirit 41 starquakes 41 Mercury magnetosphere 41 eclipsing binaries 41 RXTE 41 MN4 41 lunar dust 41 Hipparcos 41 Spitzer infrared spectrograph 41 wheeled rovers 41 orbital 41 aurorae 41 nebula 41 spectrograph 41 planetary Transits 41 comet Wirtanen 41 antihelium 41 supernovae explosions 41 nanocrystals 41 Cepheid variables 41 rover Curiosity 41 NASA Lunar Prospector 41 galactic cosmic rays 41 basaltic rocks 41 star IM Pegasi 41 infrared spectrometers 41 Imaging Spectroradiometer MODIS instrument 41 Ultraviolet Imaging Spectrograph UVIS 41 Olympus Mons 41 CAIs 41 BepiColombo 41 Small Magellanic Cloud 41 starburst galaxy 41 Hayabusa capsule 41 Clementine spacecraft 41 photons particles 41 Saturn Jupiter Uranus 41 WISE mapped 41 spacecrafts 41 UA Lunar 41 Huygens probe 41 Martian arctic plain 41 arcsec 41 Cygnus Lyra region 41 Orbiter MRO 41 SDSS II