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(Click for frequent words.) 67 comet Tempel 1 67 comet nucleus 66 Tempel 1 65 comet 65 Comet Hartley 2 64 Comet Hartley 62 Churyumov Gerasimenko 62 comet Churyumov Gerasimenko 62 Comet #P/Churyumov-Gerasimenko 61 NASA Deep Impact 61 #P/Churyumov-Gerasimenko 61 Sensing Satellite LCROSS 60 RQ# 60 Galileo spacecraft 60 impactor spacecraft 60 comet #P/Churyumov-Gerasimenko 59 LCROSS spacecraft 59 asteroid Vesta 59 WD5 59 impactor 59 lunar crater 59 asteroid Steins 59 asteroid 59 Deep Impact comet 59 Comet 9P/Tempel 1 58 comet McNaught 58 flyby spacecraft 58 NASA Stardust spacecraft 58 Saturn rings 58 COROT 58 planet Uranus 58 Toutatis 58 gaseous planet 58 asteroid Lutetia 57 Comet Machholz 57 spacecraft Cassini 57 protoplanet 57 Nasa spacecraft 57 New Horizons spacecraft 57 crater Cabeus 57 Comet Lulin 57 Comet Boethin 57 Martian crater 57 cometary 57 Cassini Huygens 57 Pluto Charon 57 Comet Churyumov Gerasimenko 57 Shoemaker Levy 57 comet Wild 57 Comet Halley 57 Rosetta spacecraft 56 Titan flyby 56 Fomalhaut b 56 meteoroid 56 Stardust spacecraft 56 Deep Impact probe 56 asteroid Itokawa 56 ESA Rosetta 56 Deep Impact spacecraft 56 shepherding spacecraft 56 planetoid 56 comet Hartley 2 56 asteroid Eros 56 ejecta 56 YU# 56 comet dust 56 Saturnian moon Titan 55 Flyby spacecraft 55 copper impactor 55 galaxy NGC 55 NASA LCROSS 55 spiral galaxy NGC 55 Asteroid Belt 55 Cassini Huygens spacecraft 55 Cassini flyby 55 Taurids 55 Martian terrain 55 icy moons 55 Deep Impact craft 55 Saturnian system 55 Mars Phobos 55 Earth magnetosphere 55 QQ# 55 NEAs 55 TU# [002] 55 CALIPSO 55 P/# A2 54 Saturnian 54 Saturn moon Iapetus 54 Sojourner rover 54 # Apophis 54 Orbiter LRO 54 Itokawa 54 innermost planet 54 Lunar Reconnaissance Orbiter LRO 54 retrograde orbit 54 Oort cloud 54 closest flyby 54 comet Lulin 54 Lutetia 54 Shackleton crater 54 Ring Nebula 54 asteroids 54 ringed planet 54 Corot 7b 54 meteoroids 54 Opportunity rover 54 twin Voyager spacecraft 54 Orbiter MRO 54 interstellar dust grains 54 Messenger spacecraft 54 NASA MESSENGER spacecraft 54 Convection Rotation 54 Ranging spacecraft 54 Explorer WISE 54 Deep Impact eXtended Investigation 54 EPOXI spacecraft 54 slender crescent 54 Oort Cloud 54 perihelion 54 constellation Virgo 54 Milky Way Galaxy 54 Martian equator 53 Saturn Cassini 53 GA6 53 planets orbits 53 galaxy M# [001] 53 SIRTF 53 galactic clusters 53 moon Io 53 outer planets 53 Nasa Deep Impact 53 comet chaser 53 thin crescent 53 Deep Impact mission 53 Andromeda galaxy 53 cosmic collisions 53 Cabeus crater 53 Kepler spacecraft 53 flyby 53 MN4 53 comet particles 53 comet orbit 53 NASA Opportunity rover 53 celestial sphere 53 Stardust NExT 53 cometary dust 53 Deep Impact 53 NASA Cassini spacecraft 53 Halley comet 53 Quadrantid meteor shower 53 Hubble Space Telescope HST 53 Orionids 53 Titan flybys 53 Halley Comet 53 Bonneville Crater 53 Upsilon Andromedae b 53 Mars moon Phobos 53 comets asteroids 53 Jovian moons 53 orbiting Hubble Space Telescope 53 Mercury flyby 53 Voyager spacecraft 53 Kuiper Belt object 53 Earthlike planet 53 Saturn moons 52 COROT 7b 52 Kepler 9c 52 Saturn outermost moon 52 Gusev crater 52 Apophis asteroid 52 lunar perigee 52 HD#b 52 NASA EPOXI mission 52 Express orbiter 52 lunar equator 52 Saturn moon Mimas 52 Rosetta lander 52 Martian rocks 52 Quaoar 52 Muchachos Observatory 52 lunar surface 52 Isidis Planitia 52 THEMIS Images 52 Sensing Satellite 52 OSIRIS REx 52 NASA rover Opportunity 52 Curiosity rover 52 twin rover Opportunity 52 LCROSS mission 52 TrES 4 52 Apophis 52 cometary debris 52 celestial object 52 Bullet Cluster 52 Tunguska Siberia 52 distant galaxy 52 waxing gibbous moon 52 Saturnian moons 52 MESSENGER 52 Mars Pathfinder lander 52 constellation Ursa Major 52 Grammier 52 cosmic cannibal 52 planetary Transits 52 Meridiani plains 52 spacecraft 52 Virgo Cluster 52 Epoxi 52 moonlet 52 WASP #b 52 Comet #P 52 Andromeda Galaxy 52 Eta Aquarid meteor shower 52 Earth asteroid Itokawa 52 Ulysses spacecraft 52 icy comets 52 asteroids orbiting 52 Charon Pluto 52 comet Shoemaker Levy 52 martian atmosphere 52 GJ #b [001] 52 outermost planets 52 Lunar Crater Observation 52 Itokawa asteroid 52 GJ#b 51 BepiColombo 51 orbiting observatory 51 Mars Reconnaissance Orbiter MRO 51 Cassini Equinox 51 KBOs 51 Giovanni Cassini 51 WISE spacecraft 51 RS Ophiuchi 51 rover Opportunity 51 comet 9P/Tempel 51 orbited Jupiter 51 interstellar dust particles 51 Upsilon Andromedae 51 MESSENGER spacecraft 51 impactors 51 Kuiper belt 51 asteroids comets 51 star Spica 51 Comet Holmes 51 heavily cratered 51 rover Spirit 51 asteroid belt 51 orbiting Hubble telescope 51 Solar Dynamics Observatory 51 CoRoT satellite 51 Epsilon Eridani 51 Solar TErrestrial RElations Observatory 51 Quadrantids 51 interstellar particles 51 barred spiral galaxy 51 NEAR Shoemaker 51 martian 51 LCROSS 51 Galilean satellites 51 Comet McNaught 51 aphelion 51 Rover Opportunity 51 NASA rover Spirit 51 APXS 51 Centaur rocket 51 Swift Tuttle 51 Martian surface 51 Stardust capsule 51 lander Philae 51 orbiting Mars 51 Earth radii 51 Earthlike planets 51 protoplanets 51 Trojan asteroids 51 Opportunity Mars rover 51 Mars Opportunity rover 51 Lunokhod 51 Taurus Littrow Valley 51 P Churyumov Gerasimenko 51 onrushing comet 51 Victoria Crater 51 Planetary Transits 51 comets 51 Cryosat 51 O OREOS 51 exosphere 51 asteroid Apophis 51 Interstellar Boundary Explorer 51 Galaxy Evolution 51 EPOXI mission 51 CryoSat satellite 51 GRB #B 51 Viking Lander 51 X ray observatory 51 planets Uranus 51 Leonid meteor showers 51 Zeta Ophiuchi 51 orbiting 51 Red Planet 51 planetary surfaces 51 Omega Centauri 51 rover Spirit landed 51 NASA Lunar Crater 51 occultations 51 GJ #b [002] 51 neighboring Andromeda galaxy 51 Hubble Telescope 51 Eta Aquarids 51 CloudSat 51 cometary material 51 orbital velocity 51 galaxy cluster 51 MUSES C 50 astronomers 50 super perigee moon 50 Keck Interferometer 50 Kuiper belt objects 50 Comet Hale Bopp 50 smallest exoplanet 50 penumbral shadow 50 NASA Voyager spacecraft 50 Fermi telescope 50 Kuiper belt object 50 moon Phobos 50 mu Arae 50 brightest supernova 50 Martian plains 50 NASA twin rovers 50 constellation Carina 50 Heliospheric Observatory SOHO 50 Cosmic Microwave Background 50 orbiting telescope 50 Phoebe orbits 50 asteroidal 50 IBEX spacecraft 50 permanently shadowed crater 50 coronal mass ejections 50 Cosmologists 50 Cassini 50 exosolar planets 50 Galilean moons 50 Endurance Crater 50 HiRISE image 50 Mars rover Opportunity 50 Rosetta orbiter 50 trans Neptunian objects 50 Venusian atmosphere 50 Mimas 50 swingby 50 elliptical orbits 50 comets orbiting 50 Evolution Explorer 50 Geminid meteor showers 50 Shepherding Spacecraft 50 highly elliptical orbits 50 orbiting Saturn 50 constellation Hercules 50 Impactor 50 Jupiter moon Io 50 Steins asteroid 50 Cometary 50 Gliese #c 50 waning gibbous 50 moons Phobos 50 Deep Impact Extended 50 Earth Asteroid 50 Samuel Oschin Telescope 50 heliopause 50 solar corona 50 Cancri e 50 SN #A 50 gamma ray observatory 50 NASA Cassini 50 robotic explorer 50 Saturnian moon 50 planetary nebulae 50 Iapetus 50 moonlets 50 orbiter 50 Scheila 50 Epimetheus 50 Martian craters 50 Planck spacecraft 50 planets orbiting sun 50 Crewmate Tracy Caldwell 50 KAGUYA 50 ESA ASI 50 LORRI 50 WISE telescope 50 polar craters 50 constellation Cassiopeia 50 Epsilon Aurigae 50 Earth ionosphere 50 bedrock outcropping 50 arcminutes 50 Martian soil 50 whiz harmlessly 50 MAVEN 50 Orionid meteor shower 50 microlensing events 50 orbits 49 mesosphere 49 martian surface 49 SIM PlanetQuest 49 arcseconds 49 planetary embryos 49 constellation Eridanus 49 Jovian moon 49 Deep Impact flyby spacecraft 49 gibbous moon 49 micrometeoroids 49 foreground galaxy 49 Mars rovers Spirit 49 Huygens 49 Ranging MESSENGER spacecraft 49 interstellar dust samples 49 Uranus 49 Horizons spacecraft 49 elliptical galaxy 49 lunar orbits 49 Gerard Kuiper 49 galactic disk 49 NASA Kepler 49 Ultraviolet Imaging Spectrograph UVIS 49 transiting exoplanet 49 Hubble Space telescope 49 waxing crescent 49 Hubble telescope 49 sun corona 49 Methone 49 moon Ganymede 49 Kuiper Belt Object 49 Viking landers 49 ESA SMART 49 NASA Stardust NExT 49 Solar Orbiter 49 Sky gazers 49 stellar occultation 49 planet orbits 49 asteroid flyby 49 Kuiper Belt Objects 49 Gravitational lensing 49 THEMIS Image 49 CoRoT 49 DIXI 49 comet Wirtanen 49 ESA Huygens probe 49 robotic spacecraft 49 Triangulum 49 star Gliese 49 orbit insertion 49 spiral galaxy 49 Orbiting Carbon Observatory 49 Endurance crater 49 Nasa Mars Reconnaissance 49 ejecta blanket 49 Asteroid 49 constellation Aquarius 49 Jupiter moons 49 moons orbiting Saturn 49 martian soil 49 NASA STEREO 49 Cabeus 49 stellar occultations 49 fainter objects 49 X ray telescopes 49 Relations Observatory STEREO 49 Pleiades cluster 49 unmanned probes 49 Nasa Kepler 49 interplanetary spacecraft 49 transiting planet 49 magnetotail 49 Encke gap 49 Manned missions 49 rover Curiosity 49 Solar System 49 Cosmonaut Yuri Gagarin 49 Astronomers 49 MARSIS radar 49 galaxy M# [002] 49 Tempel Tuttle 49 Valles Marineris 49 periodic dimming 49 impactor probe 49 Hale Bopp 49 Stardust NExT mission 49 NASA Spirit rover 49 spacecraft flyby 49 Perseids Meteor Shower 49 polar orbit 49 CoRoT 7b 49 moon Deimos 49 Comet Shoemaker Levy 49 navigate autonomously 49 submillimeter wavelengths 49 Nasa Mars Odyssey 49 six wheeled rover 49 intrinsic brightness 49 distant quasar 49 NuSTAR 49 jovian 49 NASA Kepler telescope 49 inner asteroid belt 49 comet Boethin 49 Herschel Space 49 Rosetta comet chaser 49 N. Rathnasree 49 Bug Nebula 49 S/# [001] 48 spiral galaxy Messier 48 Cassini Huygens Mission 48 Gravity Probe B 48 moons Europa 48 Meteor showers 48 highly elliptical orbit 48 infrared telescopes 48 Gliese #e 48 Herschel telescope 48 Phobos Grunt 48 Dumbbell Nebula 48 inhabitable planets 48 Cassini spacecraft 48 Tunguska object 48 interstellar space 48 Yinghuo 1 48 perigee moon 48 Antennae Galaxies 48 Flyby 48 Asteroid Itokawa 48 lunar soil 48 XMM Newton satellite 48 Rover MER 48 Henize #-# 48 Lyrid meteor shower 48 radial velocity 48 Supernova #A 48 Comet #P/Holmes 48 waxing gibbous 48 Cepheid variables 48 exo planets 48 Huygens mission 48 Saturn moon 48 Tycho Brahe 48 microscopic imager 48 Lunar CRater Observation 48 ATLAS detector 48 Planck satellite 48 copper fortified impactor 48 SN #gy 48 BLG #Lb 48 ESA Huygens 48 NASA rovers Spirit 48 gravitational slingshot 48 zodiacal light 48 astrometric 48 NASA Lunar Prospector 48 quark gluon plasma 48 asteroids Ceres 48 exoplanetary 48 Venusian surface 48 Aqua satellite 48 Enceladus flybys 48 Caloris Basin 48 supernova explosion 48 rotational axis 48 infrared telescope 48 Jupiter magnetosphere 48 constellation Centaurus 48 Martian atmosphere 48 field Infrared Survey 48 planet Gliese #c 48 heliosheath 48 elongated orbits 48 WISE infrared 48 star IM Pegasi 48 planet TrES 48 Pluto Eris 48 exo planet 48 Leonids 48 moon permanently shadowed 48 cosmic microwave radiation 48 Virgo cluster 48 GOCE satellite 48 constellation Taurus 48 THEMIS satellites 48 Mars Odyssey spacecraft 48 Jupiter icy moons 48 star Proxima Centauri 48 protoplanetary disk 48 sols 48 VIRTIS 48 Kepler Telescope 48 Elenin 48 Space ENvironment GEochemistry 48 lunar meteorites 48 Mössbauer 48 telescope Uranus 48 planet WASP #b 48 WMAP satellite 48 Geminid 48 Mars 48 moon Mimas 48 coronal mass ejections CMEs 48 NASA rovers 48 HiRISE camera aboard 48 Jupiter Icy Moons 48 Ares Vallis 48 NASA THEMIS 48 spacecrafts 48 XO 3b 48 lunar crust 48 Endeavour Crater 48 coronal mass ejection 48 exoplanets orbiting 48 Observatory SDO 48 equatorial orbit 48 penumbral lunar eclipse 48 Syrtis Major 48 Sojourner Rover 48 Mars Atmosphere 48 Martian landscape 48 Atlantis undocks 48 circumstellar disks 48 rock outcrop 48 Tunguska asteroid 48 Herschel Space Telescope 48 Phobos 48 NEOSSat 48 cometary impacts 48 Hayabusa spacecraft 48 V# Puppis 48 circular orbit 48 arcsec 48 YORP effect 48 millisecond pulsar 48 irregularly shaped asteroid 48 Kepler Space Telescope 48 orbital resonance 48 Cassini flybys 48 arcsecond 48 robot rovers 48 Earth asteroids 48 waning crescent Moon 48 constellation Cetus 48 WISE mapped 48 Kuiper Belt objects 48 zodiacal constellations 48 Lunar Prospector 47 ray Space Telescope 47 red supergiant 47 Arches Cluster 47 cluster NGC 47 Mars Reconnaissance Orbiter 47 Stardust mothership 47 Jupiter flyby 47 LCROSS Lunar Crater Observation 47 Jules Verne ATV 47 circular orbits 47 OGLE TR 47 cometary nucleus 47 TNOs 47 planemos 47 Space Telescope GLAST 47 constellation Sagittarius 47 HD #b [002] 47 subsurface ocean 47 Enceladus 47 comet tail 47 celestial bodies 47 polarimetry 47 comets meteors 47 cosmological distances 47 gravitational keyhole 47 HD #b [001] 47 waning crescent 47 Orionid meteors 47 extrasolar 47 rocky extrasolar planet 47 radial velocities 47 Perseid Meteor Shower 47 earthshine 47 Red Rectangle 47 rocky planets 47 COROT exo 3b 47 cosmic particles 47 antimatter particles 47 lunar orbiter Chang'e 47 lunar orbit 47 Pleiades star 47 globular clusters 47 tiny meteoroids 47 Hubble Space 47 TanDEM X 47 extrasolar planet 47 orbits Saturn 47 Viking orbiters 47 Ocean Salinity SMOS 47 comet flyby 47 Geminids 47 craters 47 Hayabusa probe 47 planet magnetosphere 47 SKY WATCH 47 airborne particles affect 47 moon Iapetus 47 Lunar eclipse 47 Saturn moon Enceladus 47 thrilling stargazers 47 Stephan Quintet 47 planets orbiting distant 47 Foton spacecraft 47 gravitational lenses 47 circumlunar 47 globular cluster 47 substorm 47 proto galaxies 47 meter diametre 47 Martian orbit 47 unmanned spacecraft 47 Cosmic Origins Spectrograph 47 astronomical phenomena 47 galaxies collide 47 GALEX 47 NASA Hubble Space 47 orbiting Kepler telescope 47 Lagoon Nebula 47 ESO VLT 47 Milky Way 47 Mars Orbiter Camera 47 ultraluminous galaxy 47 Gravitational waves 47 distant supernovae 47 SOHO spacecraft 47 NASA Spacecraft 47 Martian rovers 47 coronal loops 47 Investigation DIXI 47 Descent Imager Spectral Radiometer 47 pericentre 47 Martian dust 47 Kepler observatory 47 Voorwerp 47 gaseous planets 47 Mössbauer spectrometer 47 Late Heavy Bombardment 47 Orion nebula 47 orbital insertion 47 perigee 47 magnetosphere 47 Infrared Pathfinder Satellite 47 Geminid meteor shower 47 Astronomically speaking 47 NASAs 47 cosmic rays 47 Jupiter Ganymede 47 STEREO spacecraft 47 STEREO 47 moon 47 orbiting spacecraft 47 Wilkinson Microwave Anisotropy Probe 47 Perseid shower 47 Orion Nebula 47 satellites orbiting Earth 47 planets 47 distant galaxies 47 Philae lander 47 Laser Interferometer Gravitational Wave 47 constellation Andromeda 47 coronagraph 47 robotic lander 47 reentry capsule 47 asteroid impacts 47 moons Io 47 NASA MErcury Surface 47 lunar 47 Kepler Mission 47 magnetic monopoles 47 SN #C 47 Leonid meteor 47 gibbous 47 proto planetary disk 47 Astronomy buffs 47 twin STEREO spacecraft 47 Capricornus 47 Jupiter Uranus 47 lander 47 permanently shadowed 47 comet Tempel Tuttle 47 Lake Cheko 47 Envisat satellite 47 lensing galaxy 47 moons 47 Erik Asphaug 47 Kuiper Belt 47 GEochemistry 47 Ocean Salinity 47 Fornax cluster 47 orbiting observatories 47 Spaceguard Survey 47 constellation Auriga 47 Hayabusa capsule 47 Olympus Mons 47 NFIRE 47 Mars orbiting spacecraft 47 Solar Dynamics 47 gravity warps 47 retrograde orbits 47 STEREO mission 47 constellation Leo 47 HiRISE camera 47 Eta Carinae 47 Aurigid meteor shower 46 moon Charon 46 Foing 46 Phoenix lander 46 lunar orbiting spacecraft 46 Enceladus flyby 46 GQ Lupi 46 LISA Pathfinder 46 telescope 46 Geminga 46 asterism 46 olivine mineral 46 Chicxulub Crater 46 OGLE TR #b 46 planetoids 46 Saturn Enceladus 46 Mars Gusev Crater 46 reionization 46 Orionid 46 GSLV D3 rocket 46 planet HD #b 46 Einstein relativity theory 46 ecliptic plane 46 celestial equator 46 BP Psc 46 tiny meteoroid 46 airglow 46 Foton M3 46 Hubble 46 microlensing 46 extrasolar planetary systems 46 S/# P2 46 sized planets orbiting 46 THEMIS spacecraft 46 S/# S1 46 crescent Moon 46 particle smasher 46 umbral shadow 46 SN #D 46 astronomer Percival Lowell 46 TrES 46 weather satellite TIROS 46 Pan STARRS 46 geo synchronous transfer 46 subatomic particles 46 orbit 46 circumstellar disk 46 galaxy clusters 46 Helix nebula 46 Venusian 46 spacecraft orbited 46 NFIRE satellite 46 sunlike stars 46 celestial fireworks 46 filamentary structure 46 Leonid meteor shower 46 extrasolar planets 46 lunar regolith 46 Jenniskens 46 Huygens Probe 46 Beta Pictoris 46 magnetic reconnection 46 Europa Orbiter 46 Martian arctic plains 46 Milky Way galaxy 46 astrophysical phenomena 46 HAT P 46 Phaethon 46 cosmic 46 hypervelocity stars 46 substorms 46 albedo reflectivity 46 excavated crater 46 Planitia 46 meteoritic material 46 comet Hale Bopp 46 Chang'eI 46 Kepler #b 46 orbiting gamma ray 46 neutral mass spectrometer 46 Saturn equinox 46 LADEE 46 robotic explorers 46 Diviner instrument 46 MARSIS 46 Saturn outermost ring 46 Astrophysicists 46 Cosmic Microwave Background CMB 46 Ringed Planet 46 sunlike star 46 sky gazers 46 Nili Fossae 46 Ares IX rocket 46 Solar Terrestrial Relations 46 Russian cosmonaut Yuri Gagarin 46 Gliese #g 46 EPOXI 46 origins spectrograph 46 Borealis basin 46 NROL 46 GRB # 46 Philae 46 Discovery undocks 46 Titan smoggy 46 AB Aurigae 46 nebular 46 Sagittarius Window Eclipsing 46 ESA Mars 46 GeV 46 neutralinos 46 EPOCh 46 Delta Aquarids 46 Martian rover 46 Apollo missions 46 Earthlike 46 Lunar Crater 46 ejecta plume 46 Titan Saturn 46 piggybacked Huygens probe 46 twin rover Spirit 46 Fomalhaut 46 interferogram 46 star Fomalhaut 46 HM Cancri 46 spacetime 46 orbital eccentricity 46 Higgs boson particle 46 astrophysical objects 46 massless particles 46 antiproton 46 Mars Lander 46 Delta Cephei 46 INSAT 4CR 46 UA Lunar 46 spacecraft Chandrayaan 1 46 smoothest flattest spot 46 Rosette Nebula 46 Comet Elenin 46 shadowed crater 46 simulated lunar 46 NanoSail D 46 constellation Scorpius 46 Lunar Orbiter 46 lunar orbiter 46 lander rover 46 infrared observatory 46 Space Shuttle STS 46 interstellar dust 46 waxing crescent moon 46 Veil Nebula 46 Proxima Centauri 46 spherules 46 geo stationary orbit 46 aurorae 46 lander Beagle 2 46 Comet Tempel Tuttle 46 rover Sojourner 46 photosphere 46 outer corona 46 Herschel Crater 46 Saturn outermost 46 basaltic rocks 46 particle colliders 46 NASA Far Ultraviolet 46 sterile neutrino 46 GOCE 46 Resourcesat 2 46 phyllosilicates 46 Orbiter 46 crater 46 OGLE 46 Mandushev 46 NASA Mars Reconnaissance 46 ExoMars 46 DISR 46 Pinwheel Galaxy 46 Espenak 46 Globular Cluster 46 Keck telescopes 46 hexagonal mirrors 46 CoRoT #b 46 heliosphere 46 Chicxulub 46 G#.# +#.# 46 unaided eye 46 Martian meteorites