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(Click for frequent words.) 63 Galilean satellites 62 moon Io 62 Upsilon Andromedae 61 Jovian moons 61 planemos 61 Galilean moons 60 Jupiter moon Io 60 extrasolar 60 Earthlike planets 60 exoplanetary 60 retrograde orbit 60 CoRoT satellite 59 gaseous planet 59 Corot 7b 59 Kuiper Belt Objects 59 icy moons 59 moons circling 59 AB Aurigae 59 innermost planet 59 exoplanets orbiting 59 Jovian moon 58 Saturn moons 58 Galileo spacecraft 58 planets orbiting sun 58 Fomalhaut b 58 protoplanet 58 Epsilon Aurigae 58 radial velocity 58 Ring Nebula 58 Pluto Charon 58 WASP #b 58 Gliese #c 58 planets orbiting distant 58 Epsilon Eridani 58 KBOs 58 Cassini flyby 57 BP Psc 57 sunlike star 57 orbited Jupiter 57 Kuiper belt objects 57 occultations 57 P/# A2 57 sized planets orbiting 57 subsurface ocean 57 GJ #b [001] 57 COROT 7b 57 planets orbits 57 comets orbiting 57 trans Neptunian objects 57 extrasolar planetary systems 57 smallest exoplanet 56 Jupiter Ganymede 56 moons orbiting 56 MG J# +# 56 transiting planets 56 gravitational microlensing 56 planets comets 56 ringed planet 56 Io Europa 56 Earthlike planet 56 zodiacal light 56 radial velocity technique 56 CoRoT #b 56 DISR 56 COROT 56 periodic dimming 56 planets Uranus 56 constellation Cygnus 55 Saturn moon 55 transiting exoplanet 55 comets asteroids 55 Red Rectangle 55 Saturn Enceladus 55 intracluster 55 Saturn rings 55 STEREO spacecraft 55 Venusian 55 moons Phobos 55 asteroid Vesta 55 Cepheid variables 55 planet Uranus 55 HD #b [002] 55 lensing galaxy 55 Comet Halley 55 Mandushev 55 exo planets 55 planet Gliese #g 55 distant galaxy clusters 55 noctilucent clouds 55 stellar occultation 55 Magellanic Clouds 55 VIRTIS 55 GJ #b [002] 55 planets 55 Comet Hartley 2 55 Saturn Cassini 55 Upsilon Andromedae b 55 Kuiper belt object 54 Oort cloud 54 lunar craters 54 planets constellations 54 Kepler 9c 54 comet Churyumov Gerasimenko 54 galactic mergers 54 OGLE TR #b 54 inhabitable planets 54 CoRoT 9b 54 Gravitational waves 54 Nasa spacecraft 54 moon Europa 54 axions 54 ecliptic plane 54 Stephan Quintet 54 Kuiper Belt object 54 cosmological distances 54 BLG #Lb 54 HD#b 54 exo planet 54 exosolar planets 54 permanently shadowed craters 54 Saturnian moons 54 NEAs 54 supersymmetric particles 54 microlensing 54 Kepler #b 54 sunlike stars 54 Phoebe orbits 54 elongated orbits 54 Comet #P/Churyumov-Gerasimenko 54 Orion nebula 54 Europa Ganymede 54 Konacki 54 extrasolar worlds 54 comet #P/Churyumov-Gerasimenko 54 lobate scarps 54 AGNs 53 rotational axis 53 extrasolar planet 53 moon Enceladus 53 gamma ray observatory 53 ULP cepheids 53 occulted 53 chemical abundances 53 distant quasar 53 retrograde orbits 53 red supergiant 53 Saturnian moon Titan 53 Saturn Uranus 53 comet McNaught 53 Churyumov Gerasimenko 53 Cancri e 53 planets circling 53 Earthlike 53 spacecraft flyby 53 interstellar dust grains 53 lunar crust 53 distant supernovae 53 planets asteroids 53 KH #D 53 CoRoT 7b 53 Neptune Uranus 53 orbiting Saturn 53 Saturn moon Mimas 53 airglow 53 Trojan asteroids 53 binary asteroid 53 magnetotail 53 Fermi telescope 53 habitable worlds 53 planetary Transits 53 Comet Hartley 53 GJ#b 53 gravitationally bound 53 Wolszczan 53 Syrtis Major 53 Omega Centauri 53 THEMIS satellites 53 Sedna 53 solar prominences 53 habitable zones 53 Jonathan Lunine 53 galactic disk 53 orbits 53 circumstellar disks 53 moons Io 53 Saturnian moon 53 extrasolar planets 52 TrES 4 52 millisecond pulsar 52 Kuiper Belt objects 52 OGLE TR 52 circular orbits 52 TrES 52 intrinsic brightness 52 comets meteors 52 NASA Kepler telescope 52 Zeta Ophiuchi 52 waning gibbous 52 jovian 52 Jupiter moons Europa 52 Delta Cephei 52 X ray telescopes 52 asteroidal 52 Kuiper belt 52 fainter objects 52 galactic cores 52 filamentary structure 52 Saturn Jupiter Uranus 52 millisecond pulsars 52 substorm 52 comet Lulin 52 telescopic observations 52 ESA Mars 52 occultation 52 Hanny Voorwerp 52 Corot 9b 52 Beta Pictoris b 52 Helix Nebula 52 Gliese #g 52 Saturnian 52 Red Planet 52 Pleiades cluster 52 BP Piscium 52 GLAST telescope 52 rocky extrasolar planet 52 Galaxy Evolution 52 Descent Imager Spectral Radiometer 52 habitable planets 52 aurorae 52 constellation Hercules 52 Hubble observations 52 earthshine 52 cosmic phenomena 52 Giovanni Cassini 52 microlensing events 52 NASA rovers Spirit 52 HD #b [001] 52 planetary nebulae 52 cometary debris 52 Voorwerp 52 highly elliptical orbit 52 stellar seismology 52 Virgo Cluster 52 smoggy atmosphere 52 SN #C 52 distant galaxy 52 volcanic moon Io 52 HM Cancri 52 Cosmic Microwave Background 52 celestial phenomena 52 constellation Cassiopeia 52 Comet Encke 52 astronomers 52 Bug Nebula 52 polar craters 52 icy comets 52 Uranus Neptune 52 axial tilt 52 GQ Lupi 52 Nasa Mars Reconnaissance 52 orbiting planets 52 Huygens descent 52 Gliese #d 52 comet nucleus 52 Comet Machholz 52 IRC +# 52 olivine mineral 52 Huygens mission 52 constellations planets 52 Henize #-# 52 SN #A 52 Voyager spacecraft 52 VB #b 52 coronal loops 51 luminous galaxies 51 moon Charon 51 Orbiter LRO 51 Grillmair 51 Evolution Explorer 51 magnetospheric 51 celestial sphere 51 galaxy M# [002] 51 Gliese #e 51 interstellar dust 51 planetary surfaces 51 Uranus 51 planetary nebulas 51 photosphere 51 constellation Carina 51 Toutatis 51 infalling 51 UDFy # 51 Martian atmosphere 51 Cygnus X 51 Jupiter Uranus 51 IBEX spacecraft 51 reionization 51 nebulae 51 asteroids comets 51 Cassini spacecraft orbiting 51 galaxy M# [001] 51 Maunder minimum 51 Mars Uranus 51 constellation Eridanus 51 Mars moon Phobos 51 moon Ganymede 51 stellar occultations 51 waxing crescent 51 outer planets 51 planet gravitational tug 51 GALEX 51 Cassini Huygens 51 spacecraft Cassini 51 Comet Holmes 51 Charon Pluto 51 type Ia supernovae 51 Martian surface 51 tholins 51 EPOXI spacecraft 51 gaseous planets 51 Kepler Space Telescope 51 Quadrantids 51 moonquakes 51 cometary material 51 exoplanets planets 51 protoplanets 51 brightnesses 51 spherical halo 51 accretion disks 51 Kuiper Belt Object 51 Comet Hale Bopp 51 extrasolar planets orbiting 51 galactic bulge 51 Shoemaker Levy 51 Viking landers 51 Fornax cluster 51 Saturn magnetosphere 51 planet HD #b 51 martian surface 51 solar corona 51 planets atmospheres 51 Kepler Mission 51 Hyakutake 51 V# Mon 51 Hubble orbits 51 Interstellar Boundary Explorer 51 comet Hale Bopp 51 Carina constellation 51 Eridanus 51 substorms 51 Mars orbiting spacecraft 51 mu Arae 51 NASA EPOXI mission 51 radial velocities 51 astrometry 51 spiral nebulae 51 orbiting Hubble Space Telescope 51 Sromovsky 51 astrophysical objects 51 orbiting Mars 51 ejecta blanket 51 Infrared Array Camera 51 planets Kepler 51 Mercury flyby 51 interstellar boundary 51 exoplanet orbiting 51 Orionids 51 SN #gy 51 diffuse aurora 51 constellation Taurus 51 Martian terrain 51 Orbiter MRO 51 X ray emission 51 Cygnus Lyra region 51 transiting planet 51 gravitational wobbles 51 interacting galaxies 51 Doppler shift 50 Solar TErrestrial RElations Observatory 50 planet orbiting 50 Wolf Rayet star 50 planets orbiting 50 HiRISE image 50 Titan smoggy 50 Ulysses spacecraft 50 radial velocity method 50 cryovolcanism 50 NASA Cassini spacecraft 50 Rosetta spacecraft 50 elliptical galaxies 50 constellation Cetus 50 lunar equator 50 exosphere 50 planets moons 50 NASA LCROSS 50 Type 1a supernova 50 earthlike planets 50 filamentary structures 50 RRATs 50 sterile neutrino 50 astrophysical phenomena 50 APXS 50 Herbig Ae Be 50 merging galaxies 50 moons 50 Epoxi 50 Martian rocks 50 THEMIS 50 rocky planets 50 Jupiter icy moons 50 dwarf spheroidal galaxies 50 Gamma ray burst 50 SN#A 50 Kepler spacecraft 50 N. Rathnasree 50 IRAS #-# 50 gravitational tides 50 geyser plumes 50 Meridiani 50 galactic clusters 50 heavily cratered 50 smallest exoplanets 50 Orion constellation 50 robotic explorer 50 Magellanic Stream 50 brown dwarf 50 thin crescent 50 nucleosynthesis 50 dust enshrouded 50 exoplanetary systems 50 icy moon Enceladus 50 Earth magnetotail 50 Explorer WISE 50 Solar Dynamics Observatory 50 Titan flyby 50 supervolcanoes 50 moons Europa 50 interstellar dust clouds 50 supernova explosion 50 constellation Scorpius 50 asterism 50 moons orbiting Saturn 50 galaxies collide 50 EPOXI 50 Cassini Huygens spacecraft 50 Saturnian system 50 Pieter van Dokkum 50 muon neutrino 50 ionized hydrogen 50 Martian rovers 50 Jenniskens 50 faraway galaxies 50 rover Opportunity 50 planetary transits 50 Sasselov 50 super Earths 50 barred spiral galaxy 50 gravitational lensing 50 orbiting 50 gravitational interactions 50 Cassini 50 HD# [002] 50 prograde 50 proto planetary disk 50 moonlet 50 R Coronae Borealis 50 SIM PlanetQuest 50 faint galaxies 50 asteroids orbiting 50 moon Titan 50 flybys 50 eclipsing binary 50 transiting exoplanets 50 Pleiades star 50 Planck telescope 50 Rosetta lander 50 planet Gliese #c 50 proplyds 50 Lunar Prospector 50 dimming starlight 50 nebulosity 50 Triangulum 50 unaided eye 50 Cassini flybys 50 Opportunity rover 50 planet orbits 50 Hellas Basin 50 NASA satellites orbiting 50 Venusian atmosphere 50 constellation Auriga 50 binary quasar 50 constellations Cygnus 50 XMM Newton 50 Cat Paw Nebula 50 asteroid Steins 50 Comet #P 50 Coma Cluster 50 Earth asteroids 50 martian 50 galaxy formation 50 WMAP satellite 50 celestial object 50 #P/Churyumov-Gerasimenko 50 cosmic cannibal 50 ultraviolet imaging spectrograph 50 spectroscopically 50 Cosmologists 50 Io Europa Ganymede 50 Hipparcos 50 spatially resolved 50 Type Ia supernovas 50 NASA Cassini 50 inner Oort Cloud 50 ecliptic 50 LCROSS spacecraft 50 constellations 50 Heliospheric Observatory SOHO 50 Geminid meteors 49 elliptical orbits 49 NASA rovers 49 globular star 49 Relations Observatory STEREO 49 Cepheids 49 Uranus Jupiter 49 Antennae Galaxies 49 distant supernovas 49 lunar perigee 49 starquakes 49 protoplanetary disks 49 Keck Interferometer 49 infalling gas 49 Deep Impact eXtended Investigation 49 constellation Ursa Major 49 brown dwarfs 49 NASA Cassini orbiter 49 protoplanetary disk 49 SIRTF 49 HL Tau 49 sun corona 49 Christophe Lovis 49 Saturn outermost ring 49 Higgs bosons 49 Martian crater 49 Krimigis 49 Lunokhod 49 Global Surveyor 49 NASA Lunar Prospector 49 astronomical objects 49 Andromeda Galaxy 49 distant galaxies 49 perihelion 49 ultraviolet wavelengths 49 Mimas 49 magnetic polarity 49 noctilucent 49 Comet NEAT 49 Ganymede 49 polar vortex 49 XO 3b 49 moon Mimas 49 slender crescent 49 Lake Cheko 49 THEMIS spacecraft 49 gravitational interaction 49 extrasolar planet HD #b 49 unmanned probes 49 mineralogical composition 49 Comet 9P/Tempel 1 49 zodiac constellations 49 ESA Rosetta 49 Meridiani plains 49 Perseus Cluster 49 Ontario Lacus 49 stellar nurseries 49 Asteroid Belt 49 X ray afterglow 49 planetary embryos 49 NGC #A 49 Pancam 49 Martian meteorites 49 Emily Lakdawalla 49 constellation Sagittarius 49 waning crescent 49 axis wobbles 49 Geminga 49 coronagraph 49 Antiope 49 magnetic monopoles 49 superluminal 49 comet 49 NASA twin rovers 49 Pluto moon Charon 49 Comet Tempel 1 49 phyllosilicates 49 Valles Marineris 49 Hot Jupiters 49 Kraken Mare 49 X ray wavelengths 49 zodiacal dust 49 Gerhard Schwehm 49 Saturn outermost 49 LADEE 49 gravitational lenses 49 matter antimatter asymmetry 49 Comet Lulin 49 hunting Kepler telescope 49 Earth magnetosphere 49 Mercury Uranus 49 hydrogen helium 49 Herschel Space Telescope 49 constellation Virgo 49 Shepherding Spacecraft 49 Deep Impact comet 49 polar mesospheric clouds 49 Doppler shifts 49 Oort Cloud 49 exoplanets 49 Neptune Jupiter 49 neutrino particles 49 assumed planets circling 49 planet transits 49 HAT P 49 Andromeda galaxy 49 supergiant star 49 photometry 49 supernovae explode 49 Viking Orbiter 49 whiz harmlessly 49 WISE infrared 49 Planetary Transits 49 QQ# 49 extraterrestrial civilizations 49 Planck satellite 49 galactic cosmic rays 49 Saturn outermost moon 49 lunar meteorites 49 electron neutrinos 49 penumbral shadow 49 Enceladus 49 Trifid Nebula 49 Quadrantid meteor shower 49 GRBs 49 carbonaceous chondrite 49 cometary dust 49 celestial 49 Convection Rotation 49 planet magnetosphere 48 called gravitational microlensing 48 Endurance crater 48 Ultraviolet Imaging Spectrograph UVIS 48 X ray binaries 48 MARSIS radar 48 electron orbits 48 Lyman alpha 48 YORP effect 48 exoplanet 48 X ray binary 48 SN #D 48 Foing 48 elliptical galaxy NGC 48 Cometary 48 Europa Orbiter 48 Uranian 48 irregularly shaped asteroid 48 HUDF 48 meteorite impacts 48 Espenak 48 circumstellar 48 meteoroid impacts 48 Cassini orbiter 48 protostar 48 COROT exo 3b 48 Optical Gravitational Lensing Experiment 48 Jean Pierre Bibring 48 Noctilucent clouds 48 Martian polar 48 twin rover Spirit 48 orbits Saturn 48 constellation Centaurus 48 celestial objects 48 NASA Voyager spacecraft 48 Mars Reconnaissance Orbiter MRO 48 cosmic microwave radiation 48 kaons 48 cluster NGC 48 asteroid 48 Helix nebula 48 arcminutes 48 gravitational pulls 48 SDSS II 48 moon Mab 48 Sensing Satellite LCROSS 48 heliospheric 48 Bullet Cluster 48 orbiting gamma ray 48 retroreflector 48 rover panoramic 48 Wilkinson Microwave Probe 48 spectroscopic measurements 48 HiRISE camera aboard 48 comet Wild 48 asteroid impacts 48 impactor spacecraft 48 detect gravitational waves 48 Odyssey orbiter 48 outer corona 48 antineutrinos 48 Samuel Oschin Telescope 48 coronal loop 48 Isidis Planitia 48 magnetic substorms 48 Lunine 48 solar nebula 48 RS Ophiuchi 48 plutoids 48 Ranging spacecraft 48 elongated orbit 48 neutrino oscillation 48 Manned missions 48 moonlets 48 Io volcanoes 48 galaxy NGC 48 Hubble Space Telescope HST 48 circumstellar disk 48 van Arkel discovery 48 zodiacal constellations 48 Microlensing 48 orbiting observatories 48 constellation Pegasus 48 lunar surface 48 terrestrial planets 48 planetary conjunctions 48 SOHO spacecraft 48 PSR J# 48 Tharsis Rise 48 interstellar clouds 48 eccentric orbits 48 Encke gap 48 Shackleton crater 48 called lobate scarps 48 asteroid belt 48 star Spica 48 gibbous 48 constellation Aquarius 48 rover Sojourner 48 gravitational lens 48 star Gliese 48 foreground galaxy 48 waitress Ingrid Sufan 48 orbital eccentricity 48 Milky Way Galaxy 48 afterglows 48 telescope Uranus 48 reflection nebula 48 constellation Orion 48 Aqua satellite 48 Proxima Centauri 48 nebular 48 Phobos 48 Composite Infrared Spectrometer 48 infrared telescopes 48 moon gravitational pull 48 celestial bodies 48 interstellar dust particles 48 Wolf Rayet stars 48 interstellar particles 48 Explorer GALEX 48 planet WASP #b 48 RX J# 48 extraterrestrial UFOs 48 RXTE 48 type Ia supernova 48 gamma ray emission 48 orbiting spacecraft 48 geoneutrinos 48 Arches Cluster 48 astronomical observations 48 BepiColombo 48 orbital resonance 48 constellation Draco 48 starlight 48 flyby spacecraft 48 planetary atmospheres 48 dust devils 48 Cassini Huygens Mission 48 VY Canis Majoris 48 hydrated minerals 48 astrophysicists 48 Earth radii 48 meteoritic material 48 Doppler measurements 48 Extrasolar planets 48 Saturn aurora 48 interferograms 48 Gravitational lensing 48 twin STEREO spacecraft 48 twin rover Opportunity 48 martian soil 48 thermonuclear reactions 48 neutron spectrometer 48 spinning neutron stars 48 Extrasolar Planet Search 48 Exoplanets 48 ESO telescopes 48 Lulin 48 KT boundary 48 shadowy craters 48 Kailash Sahu 48 Great Orion Nebula 48 planet HD#b 48 gravitational slingshot 48 constellation Aquila 48 journal Meteoritics 48 Geminids 48 XTE J# 48 celestial equator 48 Martian dust 47 undersea volcanoes 47 MESSENGER spacecraft 47 GigaGalaxy Zoom 47 blue supergiant 47 distant quasars 47 ejecta 47 flyby 47 Curiosity rover 47 waning crescent Moon 47 Lyrids 47 dustier stormier atmosphere 47 Mars Pathfinder 47 ESA Cluster 47 interstellar cloud 47 PSR B# +# 47 galaxy redshift 47 energetic electrons 47 LORRI 47 Nasa Kepler 47 backscattered 47 Lunar Reconnaissance Orbiter LRO 47 spiral galaxy NGC 47 Lutetia 47 Pluto Eris 47 Spitzer infrared telescope 47 nebula 47 navigate autonomously 47 polygon patterns 47 spectral fingerprint 47 dynamical evolution 47 rover Spirit 47 Fashion Movie Reviews 47 HIP #b 47 Caloris Basin 47 spiral galaxies 47 infall 47 Saturn moon Iapetus 47 thrilling stargazers 47 Hale Bopp comet 47 planet TrES 47 astrobiologists 47 spaceweather.com 47 faintest galaxies 47 Svedhem 47 KT extinction 47 Astrological lore 47 gravitational tug 47 waxing gibbous 47 Eta Aquarids 47 SPICAM 47 HIRES spectrometer 47 Mauna Kea Hawaii 47 Beta Pictoris 47 Spitzer Space Telescope 47 moons Io Europa Ganymede 47 polar latitudes 47 layered bedrock 47 orbiting telescope 47 orbital inclination 47 Venus Neptune Uranus 47 Venus Uranus 47 gray hematite mineral 47 neutralinos 47 telescopes astronomers 47 meteoroid 47 magnetospheres 47 constellation Lacerta 47 Tau Ceti 47 Gusev crater 47 EPOXI mission 47 cosmic microwave background 47 spectroscopic observations 47 globulars 47 planetary 47 Trifid 47 astronomical phenomena 47 Avishay Gal Yam 47 cometary impacts 47 gamma rays emitted 47 Giovanni Schiaparelli 47 magnetic reconnection 47 planetary nebula 47 SCP #F# 47 martian atmosphere 47 moon Phobos 47 Mars Phobos 47 NASA Opportunity rover 47 asteroid collisions 47 bedrock outcropping 47 robot rovers 47 gravitational keyhole 47 Amateur astronomers 47 highly elliptical orbits 47 Hyades 47 planet habitability 47 rotating neutron stars 47 comet chaser 47 comet Tempel Tuttle 47 exerts gravitational pull 47 LRO spacecraft 47 Higgs particle 47 Venusian surface 47 proto galaxies 47 asteroseismology 47 comet orbit 47 Ringed Planet 47 Dynamics Observatory 47 galaxy clusters 47 Digitized Sky Survey 47 Valles Marineris canyon 47 novae 47 Perseid shower 47 Hale Bopp 47 muon neutrinos 47 faraway galaxy 47 Milky Way halo 47 S/# P2 47 #P/Holmes 47 Crab Pulsar 47 HiRISE images 47 XMM Newton satellite 47 scarps 47 Neutron Spectrometer 47 orbiting telescopes 47 Sombrero Galaxy 47 Quaoar 47 Neukum 47 Higgs boson particle 47 Halley comet 47 Type 1a supernovae 47 Hinode spacecraft 47 hydrostatic equilibrium 47 auroral 47 waxing gibbous moon 47 orbital insertion 47 Bonneville Crater 47 moon 47 hot Jupiters 47 demote Pluto 47 isotopic ratios 47 shadowed craters 47 galaxies nebulae 47 magma ocean 47 ESA Huygens probe 47 ESA ASI 47 meridional flow 47 Deep Impact craft 47 Mini Thermal Emission 47 Jupiter Saturn 47 ExoMars rover 47 Saturn 47 galactic 47 baryonic 47 Muchachos Observatory 47 Martian plains 47 Adam Riess 47 Trapezium 47 gravitational perturbations 47 Rosetta orbiter 47 Terra Meridiani 47 lava tubes 47 gamma ray flares 47 Viking Lander 47 Mars Odyssey spacecraft 47 Elenin 47 electron neutrino 47 Earth ionosphere 47 crystalline silicates 47 hypervelocity stars 47 comet particles 47 Tauri Sb 47 midlatitudes 47 planetary explorations 47 Gliese #G 47 protoplanetary disc 47 hydroxyl molecules 47 Viking orbiters 47 Comet Elenin 47 Hubble Constant 47 potentially habitable planets 47 globular cluster 47 magnetar