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(Click for frequent words.) 60 Io Europa 53 moons Io 53 Venusian 52 Europa Ganymede 51 moon Ganymede 51 P/# A2 50 Jovian moons 50 moons Europa 50 Saturnian moon 50 heavily cratered 50 Jovian moon 50 Io 50 Oort Cloud 50 Galilean satellites 50 Kuiper belt 49 moons Phobos 49 Galilean moons 49 icy moons 49 Andromeda 49 Jupiter moons 49 Kuiper Belt objects 49 Kuiper belt objects 49 retrograde orbit 49 Quaoar 49 Antiope 49 Sedna 49 Kuiper Belt object 49 Jupiter moons Europa 49 planetoid 48 Saturn moon 48 planets orbits 48 Epimetheus 48 planets Uranus 48 galaxy M# [001] 48 sunlike star 48 Pluto Charon 48 Uranian 48 galaxy M# [002] 48 Io Europa Ganymede 48 gibbous 47 gaseous planet 47 Phaethon 47 Saturnian 47 jovian 47 HD#b 47 HD #b [002] 47 waning crescent Moon 47 asterism 47 Oort cloud 47 Upsilon Andromedae 47 Galileo spacecraft 47 Saturn Enceladus 47 Ring Nebula 47 Saturn Jupiter Uranus 46 Orion constellation 46 Semele 46 exoplanetary 46 moons 46 Epsilon Aurigae 46 Saturn Uranus 46 Jupiter Ganymede 46 KBOs 46 Mars Phobos 46 Andromeda galaxy 46 GJ#b 46 Saturnian moons 46 HD# [002] 46 moons orbiting 46 moons circling 46 planet Uranus 46 moon Dione 46 GQ Lupi 46 comets orbiting 46 subsurface ocean 45 Enceladus 45 moon Charon 45 Saturn moons 45 Phoebe orbits 45 Saturn Cassini 45 orbits Saturn 45 Solar TErrestrial RElations Observatory 45 Syrtis Major 45 supergiant star 45 gravitationally 45 Fomalhaut b 45 Epsilon Eridani 45 constellation Aquarius 45 airglow 45 Pleiades cluster 45 Phobos 45 Hale Bopp 45 protoplanetary disks 45 exosphere 45 Uranus 45 brown dwarf 45 Saturn rings 45 nebulosity 45 SEGUE 45 eccentric orbits 45 cosmic cannibal 44 Wolf Rayet star 44 Cassini flyby 44 asteroid Vesta 44 Kuiper Belt Objects 44 zodiacal constellation 44 extrasolar 44 Trapezium 44 distant galaxy 44 Dejah Thoris 44 Eridanus 44 protoplanet 44 slender crescent 44 Omega Nebula 44 galactic clusters 44 accretion disks 44 Iapetus 44 orbiting Saturn 44 Caloris 44 Pluto Eris 44 brown dwarfs 44 Zeta Ophiuchi 44 Andromeda Galaxy 44 proto cluster 44 Corot 7b 44 Triangulum 44 orbital resonance 44 Charon 44 cosmic phenomena 44 constellation Aquila 44 accretion disk 44 moon Io 44 carbonaceous chondrite 44 WASP #b 44 outer planets 44 circumstellar disk 44 Virgo cluster 44 constellation Lyra 44 merging galaxies 44 Hot Jupiters 44 COROT exo 3b 44 Mimas 44 Earth magnetosphere 44 rotational axis 44 Comet Lulin 44 Hanny Voorwerp 44 zodiacal constellations 44 BLG #Lb 44 planetoids 44 galaxy NGC 44 Solar System 44 Comet Halley 43 moonlet 43 reflection nebula 43 OGLE TR #b 43 red supergiant 43 constellation Virgo 43 photosphere 43 planetary nebula 43 proplyds 43 Arabia Terra 43 Hyades 43 Canis Major 43 ejecta 43 moon Mimas 43 ESA Mars 43 sized planets orbiting 43 spacecraft flyby 43 polar vortex 43 Monoceros 43 Astrophysical 43 Orcus 43 Tarantula Nebula 43 TrES 4 43 Earthshine 43 volcanic moon Io 43 cometary debris 43 planemos 43 nebulae 43 Cometary 43 HL Tau 43 Exoplanet 43 sextile 43 solar nebula 43 constellations Cygnus 43 star Proxima Centauri 43 galactic disk 43 gravitational pulls 43 Venus 43 exoplanets orbiting 43 HiRISE image 43 noctilucent clouds 43 SDSS II 43 Upsilon Andromedae b 43 Jupiter moon Io 43 moon Europa 43 planetary Transits 43 COROT 43 gravitationally bound 43 lunar craters 43 Infrared Thermal Imaging Spectrometer 43 Valles Marineris 43 Convection Rotation 43 Planck satellite 43 Churyumov Gerasimenko 43 constellation Leo 43 planetesimals 43 Relations Observatory STEREO 43 arcminutes 43 Uranus Neptune 43 NASA Cassini 43 blue supergiant 43 Noctilucent clouds 43 Makemake 43 comet Hale Bopp 43 constellation Taurus 43 Toutatis 43 KH #D 42 Helix Nebula 42 galactic mergers 42 zodiacal dust 42 Virgo Cluster 42 planetary nebulae 42 moonlets 42 Cassini 42 constellation Hercules 42 globular cluster 42 Comet Hartley 2 42 Methone 42 Coma Berenices 42 Jacque Fresco 42 occulted 42 Scorpius 42 Earthlike 42 Kuiper Belt Object 42 Kepler 9c 42 PSR J# 42 constellation Sagittarius 42 constellation Auriga 42 NASA Solar Terrestrial 42 moon Titan 42 celestial equator 42 Earthlike planets 42 constellation Cygnus 42 spiral galaxy NGC 42 planet TrES 42 Omega Centauri 42 Exoplanets 42 zodiacal light 42 comets 42 Mars 42 Lunar Prospector 42 nebulas 42 planet orbits 42 CoRoT 9b 42 Saturn magnetosphere 42 star Spica 42 supernova remnants 42 zodiac constellations 42 cosmos 42 Planetary nebulae 42 Muchachos Observatory 42 Polyphemus 42 dwarf spheroidal 42 waxing crescent moon 42 SIRTF 42 waning gibbous moon 42 inner moons 42 orbital inclination 42 lunar crust 42 NASA rovers Spirit 42 celestial object 42 Gliese #d 42 GJ #b [001] 42 Dwarf Planet 42 THEMIS Image 42 trans Neptunian objects 42 Betelgeuse 42 Stephan Quintet 42 Quadrantid 42 Orion Nebula 42 celestial sphere 42 GJ #b [002] 42 protostars 42 CoRoT satellite 42 galactic halo 42 Gliese #c 42 Cold Dark Matter 42 Jupiter Saturn 42 Algol 42 Beta Pictoris 42 WISE spacecraft 42 emission nebula 42 Herschel Planck 42 asteroids comets 42 Cat Paw Nebula 42 NGC #A 42 constellation Carina 42 icy moon Enceladus 42 SMBHs 42 Reiner Gamma 42 proto planetary disks 42 star Beta Pictoris 42 filamentary structure 42 quincunx 42 polar craters 42 ionized hydrogen 42 Comet #P/Churyumov-Gerasimenko 42 nebula 42 protoplanets 41 OGLE TR 41 Milky Way Galaxy 41 planet HD #b 41 moon Mab 41 extrasolar planetary systems 41 Magnetosphere 41 interstellar dust grains 41 constellation Andromeda 41 Proxima Centauri 41 Bellatrix 41 XTE J# 41 planets asteroids 41 barred spiral galaxy 41 gravitational interactions 41 Dumbbell Nebula 41 Orion nebula 41 spacetime 41 galaxy cluster 41 Plutonian 41 ellipse 41 novae 41 planets comets 41 heliosphere 41 Veil Nebula 41 planets moons 41 Galaxy Evolution 41 Neptune Uranus 41 Kepler #b 41 waxing gibbous moon 41 Comet Elenin 41 mu Arae 41 Titan Saturn 41 binary quasar 41 gaseous envelope 41 Mercury Uranus 41 CoRoT 41 Keck Interferometer 41 Huygens Probe 41 perihelion 41 AU Mic 41 axis wobbles 41 protostar 41 millisecond pulsars 41 Jupiter 41 Botticelli Birth 41 Lyrae 41 Aurigae 41 neutron star 41 Explorer WISE 41 moons Io Europa Ganymede 41 equinoxes 41 silicate mantle 41 cosmological distances 41 Quadrantids 41 Haumea 41 Terpsichore 41 Jovian 41 waning gibbous 41 nebular 41 constellation Perseus 41 Mini Thermal Emission 41 circumstellar disks 41 Cassini Image 41 Triangulum Galaxy 41 chromosphere 41 innermost planet 41 comet 41 CoRoT 7b 41 X ray emission 41 meteoroids 41 globular clusters 41 Serpens 41 planet 41 VIRTIS 41 Cepheid variables 41 Fornax cluster 41 martian 41 star Gliese 41 Crab Nebula 41 Capricornus 41 comet Churyumov Gerasimenko 41 Milky Way 41 coronal loops 41 lunar maria 41 Olympus Mons 41 Rosette Nebula 41 TrES 41 Super Earths 41 Arcturus 41 comet Tempel Tuttle 41 constellation Orion 41 Saturn moons Titan 41 Milankovitch cycles 41 constellation Ursa Major 41 AB Aurigae 41 sunlike stars 41 comet nucleus 41 suns 41 plutoids 41 habitable zones 41 constellation Scorpius 41 Hippolyta 41 permanently shadowed craters 41 Martian 41 transiting planets 41 Fossae 41 Bug Nebula 40 Gemini constellation 40 Asteroid Belt 40 martian meteorites 40 prograde 40 ringed planet 40 orbital eccentricity 40 Horsehead Nebula 40 Alucard 40 constellation Draco 40 elongated orbits 40 Kuiper belt object 40 constellation Eridanus 40 LADEE 40 gravitational interaction 40 Jupiter Uranus 40 Beta Centauri 40 Eta Carinae 40 Caloris basin 40 reentry capsule 40 Kuiper Belt 40 ULIRGs 40 rayed crater 40 galactic cosmic rays 40 extrasolar planet HD #b 40 luminous galaxies 40 Huygens lander 40 solar prominences 40 magnetosphere 40 Saturnian system 40 stationary lander 40 constellation Cetus 40 BP Piscium 40 Rossby waves 40 aka Silk Spectre 40 Pleiades 40 Pleiades star 40 interstellar cloud 40 Helix nebula 40 ESA Rosetta 40 Antennae Galaxies 40 lobate scarps 40 Dwarf galaxies 40 Jupiter magnetosphere 40 Deimos 40 nebula NGC 40 V# Mon 40 stellar nurseries 40 chemical abundances 40 galaxies 40 axial tilt 40 dirty snowballs 40 Kraken Mare 40 exo planet 40 galaxy 40 Saturn moon Iapetus 40 Earth radii 40 Sromovsky 40 solar corona 40 Great Orion Nebula 40 Orbiter 40 magma ocean 40 Circinus 40 inhabitable planets 40 constellation Centaurus 40 eclipsing binary 40 Isidis Planitia 40 troposphere 40 elliptical galaxy 40 helium nuclei 40 Scheila 40 smallest exoplanet 40 Martian Manhunter 40 CoRoT #b 40 APXS 40 protoplanetary disk 40 Cassini flybys 40 IRAS #-# 40 extrasolar planets 40 Lyman alpha 40 Cloud Aerosol Lidar 40 binaries 40 magnetospheric 40 HD #b [001] 40 BepiColombo 40 Corot 9b 40 planetary orbits 40 Carina constellation 40 silicate dust 40 Magellanic Clouds 40 aphelion 40 periodic dimming 40 Lake Vostok 40 binary asteroid 40 millisecond pulsar 40 albedo reflectivity 40 NASA Cassini spacecraft 40 Trifid 40 Saturn Moons 40 Gliese #e 40 lunar equator 40 orbited Jupiter 40 ionized gas 40 Nibiru 40 tholins 40 Europa Orbiter 40 gravitational microlensing 40 Eridani 40 MEarth 40 Comet Machholz 40 penumbral shadow 40 galaxy clusters 40 ecliptic 40 celestial 40 XO 3b 40 Taurids 40 Coma Cluster 40 lunar highlands 40 J'onn 40 phyllosilicates 40 Nebula 40 infalling 40 Carina Nebula 40 starburst galaxy 40 Saturn moons Enceladus 40 fainter objects 40 Cygnus Lyra region 40 Caloris Basin 40 Milky Way galaxy 40 planets 40 crescent Moon 40 HM Cancri 40 AGNs 40 Mercury magnetosphere 40 Geminga 39 X ray binary 39 mineral olivine 39 Albedo 39 transiting planet 39 Vampiric 39 Comet #P 39 Ursa Minor 39 rocky extrasolar planet 39 alien beings 39 slender crescent moon 39 microquasar 39 comets asteroids 39 Camelopardalis 39 highly elliptical orbit 39 orb 39 visit http:/saturn.jpl.nasa.gov 39 circular orbits 39 IBEX spacecraft 39 Lyrids 39 regolith 39 Ontario Lacus 39 Extrasolar Planets 39 ammonia hydrates 39 Cydonia region 39 XMM Newton 39 impactors 39 distant supernovae 39 Uranus Jupiter 39 lensing galaxy 39 SN #A 39 Small Magellanic Cloud 39 circumstellar 39 exoplanet orbiting 39 Carinae 39 Henize #-# 39 gravitational attraction 39 Trifid Nebula 39 moon Phobos 39 rover Opportunity 39 gibbous moon 39 spiral galaxy M# 39 protoplanetary discs 39 Halley comet 39 Lagoon Nebula 39 Aristarchus 39 gaseous planets 39 Meteor Showers 39 gravitational perturbations 39 Comet Churyumov Gerasimenko 39 constellation Monoceros 39 Zor El 39 spiral galaxy Messier 39 Hipparcos 39 smoggy atmosphere 39 earthlike 39 Puppis 39 Titian Venus 39 cosmic magnifying glass 39 elliptical galaxies 39 retroreflector 39 planet orbiting 39 NASA QuikScat satellite 39 astrobiologists 39 Manned missions 39 blue straggler 39 galactic 39 Extrasolar Planet 39 Solar Terrestrial Relations 39 photometry 39 orbiting 39 Lunine 39 Kepler 9b 39 Cepheus 39 Andorian 39 Globular Cluster 39 Ringed Planet 39 interstellar dust 39 twin STEREO spacecraft 39 Cosmic Microwave Background 39 Encke gap 39 earthshine 39 JWST 39 Butterfly Nebula 39 dwarf galaxy 39 Origins Spectral Interpretation 39 Sagittarius B2 39 supermassive 39 Imbrium 39 Pluto moon Charon 39 asteroids orbiting 39 Lyra 39 Evolution Explorer 39 planet Gliese #c 39 equatorial bulge 39 Tharsis 39 Pluto 39 Doradus 39 Shackleton crater 39 magnetotail 39 Reptilians 39 ESA Integral 39 demon lord 39 exosolar planets 39 constellation Aries 39 globulars 39 terrestrial planets 39 Namora 39 transiting exoplanet 39 Comet Hale Bopp 39 magnetic polarity 39 giant elliptical galaxy 39 Eagle Nebula 39 Dione 39 asteroidal 39 Lulin 39 outermost planets 39 proto galaxies 39 Comet Hartley 39 Oceanus Procellarum 39 MG J# +# 39 occultations 39 equinox 39 Zeus Poseidon 39 dusty disks 39 SIM PlanetQuest 39 Astrological lore 39 oddball planetary 39 Sombrero Galaxy 39 spiral galaxies 39 Cosmic Evolution 39 Bullet Cluster 39 moon Enceladus 39 comet chaser 39 de Pater 39 changeling 39 aspecting 38 mythological god 38 icy comets 38 Neptune 38 Cassini Huygens 38 spiral galaxy 38 Hellas Basin 38 Earth 38 interstellar boundary 38 Cardassian 38 Zoe Graystone 38 Terrestrial Planet Finder 38 Pole Aitken 38 Extrasolar planets 38 Earthlike planet 38 Icarus 38 NASA STEREO 38 ecliptic plane 38 Heliophysics 38 Wolszczan 38 galactic cores 38 Saturn moon Mimas 38 Serpens Cauda 38 Charon Pluto 38 distant quasars 38 starlike 38 SMBH 38 coronagraph 38 comet #P/Churyumov-Gerasimenko 38 Ophiuchi 38 Flyby 38 binary asteroids 38 moons orbiting Saturn 38 NASA Spacecraft 38 corona 38 unmanned probes 38 planetary surfaces 38 Beehive Cluster 38 Comet Tempel 1 38 constellation Canis Major 38 Security Regolith Explorer 38 waning crescent moon 38 Cassini Finds 38 Planetary Transits 38 Von Rothbart 38 Mars Orbiter 38 asteroids Vesta 38 Smos 38 hydrogen helium 38 spherical 38 elliptical galaxy NGC 38 radial velocity technique 38 Aurigid 38 hot Jupiters 38 Geminids 38 ESO PR 38 Despero 38 equatorial regions 38 Peony nebula star 38 YORP effect 38 Viking landers 38 Samuel Oschin Telescope 38 Orionids 38 Red Rectangle 38 Giovanni Cassini 38 axions 38 Perseus 38 cylon 38 Sandro Botticelli 38 Merope 38 Comet NEAT 38 planet WASP #b 38 XMM Newton observatory 38 winged messenger 38 Titan flybys 38 polarimetry 38 planets circling 38 Venus Climate Orbiter 38 RS Ophiuchi 38 tidally 38 DISR 38 Martian moons Phobos 38 largest moon Charon 38 Shoemaker Levy 38 UB# [003] 38 neutral mass spectrometer 38 globular cluster M# 38 tropical latitudes 38 globular star 38 interstellar distances 38 Vourlidas 38 Antennae galaxies 38 quasar 38 gamma ray observatory 38 Neptunian 38 Great Observatories 38 Universe 38 extrasolar planet 38 Mars Uranus 38 orbits 38 asteroids Ceres 38 SN#A 38 distant quasar 38 Martian surface 38 Svedhem 38 ESO VLT 38 neutralinos 38 Morrigan 38 Fermi telescope 38 Herbig Ae Be 38 field Infrared Survey 38 ultraviolet wavelengths 38 EPOXI 38 Hubble observations 38 tidal tails 38 stellar occultation 38 comet McNaught 38 GEochemistry 38 active galactic nuclei 38 Kuiper belt disc 38 submillimeter galaxies 38 celestial bodies 38 Bonneville Crater 38 GALEX 38 Heliospheric Observatory 38 #P/Holmes 38 astrometry 38 coronal mass ejections CMEs 38 humanoid alien 38 constellation Pisces 38 planetesimal 38 JENOVA 38 virgo 38 asteroid belt 38 Angel Salvadore 38 X ray wavelengths 38 HAT P 38 starlight 38 retrograde orbits 38 comets moons 38 planetary 38 muon 38 gravitational tugs 38 Comet Tempel Tuttle 38 hadron 38 ExoMars 38 asteroid Ceres 38 extrasolar worlds 38 martian atmosphere 38 Rosetta lander 38 asteroids 38 Cassini spacecraft orbiting 38 constellation Gemini 38 moon 38 planet Gliese #g 38 Roque de los 38 Habitable Planet 38 arcseconds 38 planets orbiting stars 38 epicycles 38 submillimetre wavelengths 38 hydrated minerals 38 blazars 38 Kazantzidis 38 cryosphere 38 gravitational 38 heliocentric model 38 magnetar 38 Distant Planet 38 extragalactic 38 Hubble Space Telescope HST 38 Regolith 38 Ascendant 38 SMOS 38 Keplerian 38 constellation Ophiuchus 38 Kepler Telescope 38 Anakin Skywalker Darth Vader 38 Lutetia 38 smallest exoplanets 38 accreting 37 distant galaxies 37 Robotic Exploration 37 spherical halo 37 constellations 37 Saturn outermost 37 distant suns 37 interstellar dust clouds 37 Type 1a supernovae 37 observable universe 37 constellation Cassiopeia 37 Earth ionosphere 37 Fomalhaut 37 creatures inhabiting 37 Beta Pictoris b 37 mystical realm 37 nicknamed Xena 37 Perseids 37 Webb Telescope 37 constellation Pegasus 37 trans Neptunian 37 dwarf galaxies 37 Arthur Guinevere 37 exo planets 37 sulfate salts 37 Reflection Radiometer 37 Tau Ceti 37 Giambologna 37 Cancri e 37 solstices 37 laser altimeter 37 lander 37 Vesta 37 planet transits 37 quark gluon 37 super Earths 37 Jonathan Lunine 37 Composite Infrared Spectrometer 37 Herschel telescope 37 Globular clusters 37 COROT 7b 37 Buehler Planetarium 37 Ursa Major 37 Viking orbiters 37 Foton M3 37 heliopause 37 active galactic nucleus 37 Emily Lakdawalla 37 Yinghuo 1 37 blobs 37 FUV 37 Deep Impact eXtended Investigation 37 HiRISE camera aboard 37 relativistic particles 37 red supergiants 37 Spitzer Space Telescope 37 Martian dust 37 Saturn outermost moon 37 Tucana 37 starlike object 37 telescopic observations 37 firebird 37 waxing crescent 37 moon Iapetus 37 Breillat 37 smoothest flattest 37 ENAs 37 ESA Herschel 37 Gliese #g 37 Corot 37 Virgo 37 WD5 37 Jimi Hendrix Valleys 37 ATV Johannes Kepler 37 twin suns 37 Vanishing Face 37 gravitational lens 37 Huygens probe 37 Cassini Huygens spacecraft 37 intracluster 37 Martian terrain 37 Infrared Pathfinder Satellite 37 asteroid Steins 37 Pluto Kuiper Belt 37 Tycho Brahe 37 Neutron Detector 37 Cabeus crater 37 Ultraviolet Imaging Spectrograph 37 Zarnecki 37 asteroid flyby 37 proto planetary disk 37 Hubble Constant 37 tidal bulge 37 journal Meteoritics 37 THEMIS Images 37 Swift Tuttle 37 Geminid meteors 37 BLG #L 37 Extrasolar 37 Neptune Jupiter 37 planetary embryos 37 Botticelli painting 37 Terra Meridiani 37 hydrogen atoms 37 Jupiter Icy Moons 37 Trillian Zooey Deschanel 37 Comet Encke 37 Scutum 37 supernova SN 37 Ringworld 37 Kepler Space Telescope 37 astrophysicists 37 Mars landers 37 Herschel Space 37 polar regions 37 MESSENGER 37 radial velocities 37 magnetic monopoles 37 volcano Olympus Mons 37 cometary 37 Homunculus 37 interacting galaxies 37 Cyclops 37 sundog 37 SMEX 37 blazar 37 Ulysses spacecraft 37 IceCube 37 ESA Planck 37 Arches Cluster 37 Mars northern latitudes 37 Tempel 1 37 quasars 37 XMM Newton satellite