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(Click for frequent words.) 80 Kuiper Belt 75 Oort cloud 74 Oort Cloud 69 icy moons 69 Kuiper belt objects 68 rocky planets 68 Kuiper Belt objects 67 planetary nebulae 66 AGNs 66 dwarf galaxies 66 galaxy cluster 66 moonlet 66 Andromeda galaxy 65 globular cluster 65 Kuiper Belt Objects 65 gaseous planet 65 moonlets 65 Milky Way halo 65 Kuiper Belt object 65 galaxies 65 Beta Pictoris 65 galaxy clusters 65 Quaoar 65 protoplanetary disk 65 comets 65 trans Neptunian objects 65 planets Uranus 64 WASP #b 64 globular clusters 64 planets orbits 64 terrestrial planets 64 asteroid belt 64 Solar System 64 distant galaxy 64 GJ#b 64 retrograde orbit 64 Virgo Cluster 64 dwarf galaxy 64 Milky Way Galaxy 64 KBOs 64 globulars 64 Fomalhaut b 64 super Earths 63 galactic disk 63 Corot 7b 63 Fornax cluster 63 permanently shadowed craters 63 planetesimals 63 elliptical galaxy 63 photosphere 63 galactic halo 63 heliosphere 63 elliptical galaxies 63 moons orbiting 63 Pluto Charon 63 protoplanet 63 HD#b 63 constellation Ursa Major 63 solar nebula 63 Sedna 63 planets 63 Omega Centauri 63 nebula 63 Upsilon Andromedae 63 brown dwarfs 63 planets orbiting stars 63 TrES 4 63 lunar crust 63 asteroidal 63 Epsilon Eridani 63 Andromeda Galaxy 62 comet nucleus 62 Galilean satellites 62 Virgo cluster 62 AU Mic 62 galactic clusters 62 planetary nebula 62 protoplanetary disks 62 Saturnian moon 62 Milky Way galaxy 62 planetoid 62 Orion Nebula 62 moon Mimas 62 filamentary structure 62 constellation Virgo 62 Enceladus 62 galaxy NGC 62 HL Tau 62 Galilean moons 62 Coma Cluster 62 X ray emission 62 asteroids comets 62 ejecta 62 galaxy 62 elongated orbits 62 red supergiant 62 distant galaxies 61 magnetars 61 spacetime 61 merging galaxies 61 starburst galaxy 61 gravitationally bound 61 protoplanets 61 eccentric orbits 61 planetoids 61 brown dwarf 61 planet Uranus 61 P/# A2 61 Wolf Rayet stars 61 interstellar cloud 61 nebular 61 lensing galaxy 61 GJ #b [001] 61 Orion nebula 61 extrasolar planets 61 stellar nurseries 61 Earthlike planets 61 HD #b [002] 61 Gerard Kuiper 61 planemos 61 X ray binary 61 jovian 61 outer planets 61 Antennae Galaxies 61 elliptical orbits 60 moons 60 magnetosphere 60 galaxy M# [002] 60 ULIRGs 60 extrasolar 60 CoRoT #b 60 Saturnian moons 60 Kuiper Belt Object 60 constellation Taurus 60 Syrtis Major 60 Higgs particle 60 sunlike stars 60 gravitational interactions 60 Arches Cluster 60 neutron star 60 constellation Cassiopeia 60 dwarf spheroidal galaxies 60 neutralinos 60 heavily cratered 60 magnetar 60 Saturn magnetosphere 60 transiting planets 60 inner asteroid belt 60 supernova remnants 60 quasars 60 proto galaxies 60 moon Enceladus 60 hot Jupiters 60 reionization 60 interstellar dust 60 Epsilon Aurigae 60 Gravitational waves 60 magma ocean 60 asteroids 60 luminous galaxies 60 Lagoon Nebula 60 Hot Jupiters 60 moon Io 60 zodiacal light 60 supermassive 60 Jupiter moon Io 60 Saturnian system 60 planets asteroids 60 constellation Aquarius 60 habitable zones 60 innermost planet 60 Saturn rings 59 Milky Way 59 supernova explosion 59 proplyds 59 celestial object 59 CoRoT 7b 59 circumstellar disk 59 observable universe 59 redshift 59 supersymmetric particles 59 Tarantula Nebula 59 protostars 59 heliosheath 59 nebulae 59 Phoebe orbits 59 Pluto Eris 59 Jovian moon 59 Saturn moons 59 starburst galaxies 59 habitable planets 59 comet 59 exosphere 59 globular star 59 Gliese #g 59 smallest exoplanet 59 Cosmic Microwave Background 59 exoplanetary 59 SN #gy 59 Earthlike 59 supernova remnant 59 spiral galaxies 59 inhabitable planets 59 hypervelocity stars 59 BLG #Lb 59 supergiant star 59 millisecond pulsars 59 SN #A 59 Neutron stars 59 TNOs 59 Saturn Uranus 59 subsurface ocean 59 accretion disk 59 transiting planet 59 chromosphere 59 red supergiants 59 protoplanetary 59 planets orbiting sun 59 exoplanets 59 exoplanets orbiting 58 solar corona 58 comets orbiting 58 GRBs 58 circumstellar 58 lunar equator 58 circumstellar dust 58 moon Ganymede 58 planetesimal 58 barred spiral galaxy 58 protostar 58 ionized hydrogen 58 spiral galaxy 58 supernova explosions 58 heliopause 58 star Fomalhaut 58 Arabia Terra 58 proto cluster 58 Eta Carinae 58 constellation Eridanus 58 exosolar planets 58 submillimeter galaxies 58 circumstellar disks 58 impactors 58 Beta Pictoris b 58 astronomical objects 58 Henize #-# 58 Stephan Quintet 58 exoplanet 58 Saturn moon 58 phyllosilicates 58 active galactic nuclei 58 Jovian moons 58 interstellar medium 58 moons Phobos 58 dirty snowballs 58 Kepler #b 58 distant quasars 58 star Proxima Centauri 58 carbonate minerals 58 neutron stars 58 millisecond pulsar 58 GJ #b [002] 58 Kuiper belt object 58 Bug Nebula 58 lunar craters 58 polar craters 58 axions 58 exoplanet orbiting 58 planets moons 58 plutoids 58 retrograde orbits 57 constellation Andromeda 57 Iapetus 57 planetary embryos 57 interstellar dust grains 57 nebulosity 57 ionized gas 57 zodiacal dust 57 planets comets 57 COROT exo 3b 57 cometary 57 gravitational microlensing 57 giant elliptical galaxies 57 supermassive black holes 57 Small Magellanic Cloud 57 foreground galaxy 57 constellation Centaurus 57 inner Oort Cloud 57 interstellar space 57 chondrules 57 dwarf planets 57 exo planets 57 active galactic nucleus 57 galaxy M# [001] 57 galactic mergers 57 gravitational lenses 57 nuclei 57 Geminga 57 quasar 57 Gliese #c 57 meteoroids 57 constellation Carina 57 Trojan asteroids 57 celestial sphere 57 gravitational interaction 57 Cat Paw Nebula 57 Jupiter Ganymede 57 basaltic rocks 57 Carina Nebula 57 J# +# [002] 57 Orion constellation 57 Dumbbell Nebula 57 spherical halo 57 Globular clusters 57 Pluto moon Charon 57 asteroids orbiting 57 constellation Sagittarius 57 asterism 57 blue supergiant 57 planets orbiting distant 57 Saturn Jupiter Uranus 57 Valles Marineris 57 galactic cores 57 distant supernovae 57 SMBH 57 gravitationally 57 supernovae 57 galaxy formation 57 Bose Einstein condensates 57 interstellar boundary 57 type Ia supernovae 57 proto planetary disk 56 carbonaceous chondrite 56 Gliese #e 56 exoplanets planets 56 constellation Hercules 56 #P/Churyumov-Gerasimenko 56 Earth magnetosphere 56 Triangulum Galaxy 56 magnetic monopoles 56 sterile neutrinos 56 icy comets 56 quark gluon plasma 56 sized planets orbiting 56 fainter objects 56 SDSS II 56 Churyumov Gerasimenko 56 orbits 56 silicate dust 56 Comet Holmes 56 undersea volcanoes 56 Serpens Cauda 56 gaseous planets 56 baryonic matter 56 stony meteorites 56 interstellar clouds 56 planet Gliese #c 56 intrinsic brightness 56 sunlike star 56 nebula NGC 56 moon Charon 56 moon Mab 56 Martian craters 56 cosmological distances 56 Comet Tempel Tuttle 56 extrasolar planet 56 baryonic 56 permanently shadowed 56 Rosette Nebula 56 ringed planet 56 ecliptic plane 56 Asteroid Belt 56 Toutatis 56 Wolf Rayet star 56 mantle plumes 56 Type Ia supernova 56 collisional 56 Hanny Voorwerp 56 constellation Leo 56 Crab Nebula 56 chemical abundances 56 Perseus Cluster 56 Saturn Enceladus 56 supersymmetric 56 lunar highlands 56 astrophysical objects 56 CoRoT 9b 56 constellation Perseus 56 emission nebula 56 neighboring Andromeda galaxy 56 reflection nebula 56 coronal mass ejections CMEs 56 baryons 56 UB# [003] 56 infall 56 Cabeus crater 56 S/# P2 56 outermost planets 56 galactic bulge 56 Martian meteorites 56 Sagittarius dwarf galaxy 56 distant supernovas 56 dense clumps 56 X ray binaries 56 Bullet Cluster 56 Higgs bosons 56 outer corona 56 supermassive black hole 56 blue straggler 56 cluster NGC 56 Jupiter Saturn Uranus 56 magnetic reconnection 56 Large Magellanic Cloud 56 Gamma ray bursts 56 orbits Saturn 56 inner moons 56 planet orbits 56 Eagle Nebula 56 Mercury magnetosphere 56 Triangulum 56 Phaethon 56 constellation Auriga 56 infalling 56 accretion disks 56 Shackleton Crater 55 Wolszczan 55 moons Io 55 CoRoT satellite 55 binary asteroid 55 Comet Elenin 55 RX J# 55 Corot 9b 55 Upsilon Andromedae b 55 superheavy elements 55 Earth asteroids 55 perihelion 55 RY Sagittarii 55 cosmic phenomena 55 electron diffusion 55 cometary material 55 gravitational lensing 55 exo planet 55 carbonaceous chondrites 55 SN #C 55 ejecta blanket 55 Earthlike planet 55 G#.# +#.# 55 Cepheids 55 Doradus 55 BP Psc 55 astrophysical 55 Voorwerp 55 Shackleton crater 55 galactic cosmic rays 55 infrared wavelengths 55 tholins 55 double helix nebula 55 TrES 55 gravitational attraction 55 Dwarf galaxies 55 redshifted 55 galactic magnetic 55 galactic nuclei 55 Io volcanoes 55 Alfven waves 55 Hellas Basin 55 SN#A 55 spiral galaxy NGC 55 Uranus 55 comets asteroids 55 Bok globules 55 Candor Chasma 55 habitable zone 55 Pinwheel galaxy 55 Mimas 55 astronomers 55 Cancri e 55 Mpc 55 mineral olivine 55 occulted 55 circular orbits 55 plutoid 55 pulsar 55 Quadrantids 55 Venusian atmosphere 55 grabens 55 nicknamed Xena 55 GQ Lupi 55 WIMPs 55 Olympus Mons 55 X ray wavelengths 55 asteroid 55 elongated orbit 55 constellation Cetus 55 protoplanetary discs 55 mesosphere 55 Trifid 55 Maunder minimum 55 constellation Cygnus 55 planet orbiting 55 Galaxy Evolution 55 type Ia supernova 55 Oceanus Procellarum 55 Veil Nebula 55 Pegasi 55 XO 3b 55 antiparticle 55 sodium atoms 55 cosmic cannibal 55 Io Europa 55 giant elliptical galaxy 55 exoplanetary systems 55 Ring Nebula 54 gravitational perturbations 54 Helix Nebula 54 Pleiades star 54 filamentary structures 54 ferric oxides 54 plutons 54 planet Gliese #g 54 dynamical evolution 54 brightest supernova 54 supernova 54 volcanically active 54 Hubble observations 54 cryovolcanism 54 supercontinents 54 mu Arae 54 celestial bodies 54 comet nuclei 54 magnetospheric 54 moon Titan 54 Super Earths 54 exoplanets planets outside 54 Fomalhaut 54 hematite mineral 54 Murchison meteorite 54 habitable worlds 54 extrasolar planetary systems 54 Reiner Gamma 54 spherules 54 smallest extrasolar planet 54 proto planetary disks 54 star Spica 54 XMM Newton 54 asteroid Ceres 54 Trifid Nebula 54 masers 54 hydrated minerals 54 occultations 54 equatorial regions 54 GRB #B 54 Meridiani 54 eclipsing binary 54 cometary debris 54 Earth radii 54 Caloris 54 Ontario Lacus 54 Comet Halley 54 GeV 54 V# Mon 54 Martian equator 54 Fermi telescope 54 constellation Pisces 54 coronal loops 54 Isidis Planitia 54 planet HD #b 54 Kepler 9c 54 CAIs 54 Haumea 54 habitable planet 54 star Beta Pictoris 54 Goldilocks zone 54 nucleosynthesis 54 Comet Hale Bopp 54 Sagittarius B2 54 interacting galaxies 54 Tarantula nebula 54 spiral nebulae 54 Jupiter Saturn 54 Exoplanets 54 RS Ophiuchi 54 neutralino 54 transiting exoplanet 54 spacecraft flyby 54 sterile neutrino 54 Saturn Cassini 54 metallicity 54 Jupiter magnetosphere 54 Saturn moon Enceladus 54 intracluster 54 silicates 54 extrasolar planets orbiting 54 luminosities 54 Methone 54 VY Canis Majoris 54 comet Tempel Tuttle 54 Red Rectangle 54 Monoceros 54 globular cluster M# 54 gravitational pulls 54 Planetary nebulae 54 planets orbiting 54 kaons 54 Betelgeuse 54 heliospheric 54 atoms 54 AB Aurigae 54 stellar occultations 54 Kuiper Belt mysterious 54 constellation Lyra 54 Magellanic Clouds 54 galactic collisions 54 Coma cluster 53 God Particle 53 continental crust 53 Cassini Regio 53 Voyager spacecraft 53 aphelion 53 noctilucent clouds 53 electron neutrinos 53 gamma ray bursts 53 ancient supercontinent 53 constellation Libra 53 binary asteroids 53 Zeta Ophiuchi 53 faint galaxies 53 Lake Vostok 53 comet McNaught 53 shadowed craters 53 wrinkle ridges 53 moon Europa 53 Nili Fossae 53 TW Hydrae 53 interstellar particles 53 Omega Nebula 53 substorms 53 gamma ray emission 53 HIP #b 53 aurorae 53 umbral shadow 53 planetary Transits 53 extragalactic 53 Arsia Mons 53 non baryonic 53 VB #b 53 magnetotail 53 gravitational lens 53 elliptical galaxy NGC 53 tidally 53 Type Ia supernovas 53 Pleiades cluster 53 PSR B# +# 53 Serpens 53 Cancri 53 NGC# 53 planet WASP #b 53 undiscovered particle 53 energetic cosmic rays 53 Proxima Centauri 53 interstellar dust clouds 53 Orionids 53 lunar perigee 53 Trapezium 53 potentially habitable planets 53 Great Orion Nebula 53 planetary 53 lithosphere 53 called lobate scarps 53 star Gliese 53 largest moon Charon 53 lunar meteorites 53 moons circling 53 redshifts 53 Evolution Explorer 53 Epimetheus 53 Kuiper belt disc 53 comet tail 53 Capricornus 53 orbiting Saturn 53 tidal tails 53 polar vortex 53 Saturn innermost 53 deep convective clouds 53 Cabeus 53 particles WIMPs 53 spinning neutron 53 olivine mineral 53 plagioclase 53 prebiotic molecules 53 auroral displays 53 boson 53 rotational axis 53 constellation Scorpius 53 Seyfert galaxies 53 moon Iapetus 53 silicon monoxide 53 Mars Phobos 53 quasicrystal 53 colliding galaxies 53 cosmological theories 53 flood basalts 53 pulsars 53 chondrites 53 GZK cutoff 53 missing baryons 53 microquasar 53 HM Cancri 53 IRAS #-# 52 distant galaxy clusters 52 gamma ray burst 52 orbital resonance 52 supercontinent 52 galactic alignment 52 antimatter particles 52 Pluto 52 interstellar grains 52 icy moon Enceladus 52 Type Ia supernovae 52 Makemake 52 COROT 52 MG J# +# 52 unmanned probes 52 gamma ray observatory 52 superdense 52 Astrophysicists 52 CMB radiation 52 Gusev crater 52 Jupiter moons 52 radial velocity method 52 outermost planet 52 supergiants 52 energetic electrons 52 faintest galaxies 52 periodic dimming 52 constellation Ophiuchus 52 gravity warps 52 gravitational waves 52 blazar 52 cosmic microwave background 52 Lunine 52 asteroid Vesta 52 subglacial lake 52 constellation Ara 52 Supernova #A 52 nucleobases 52 weakly interacting 52 Planitia 52 cosmological 52 zodiac constellations 52 planetary nebulas 52 Gliese #d 52 distant suns 52 meteoroid impacts 52 SMBHs 52 constellation Aries 52 crystalline silicates 52 Saturn outermost 52 CLG J# # 52 geologically active 52 Astrological lore 52 hydrothermal vent 52 HiRISE image 52 blazars 52 spheroidal 52 supersymmetry 52 IRC +# 52 dwarf planet 52 RQ# 52 constellation Coma Berenices 52 galactic equator 52 Crab Pulsar 52 Chicxulub 52 galactic 52 #gy 52 strange quark 52 visible wavelengths 52 Cosmologists 52 Cepheid variables 52 Tharsis Rise 52 Europa Ganymede 52 planetary surfaces 52 southern supercontinent 52 helium atoms 52 W boson 52 Tharsis 52 permanently shadowed regions 52 regolith 52 Eridanus 52 unaided eye 52 Tianyulong 52 constellation Orion 52 moons Europa 52 planet magnetosphere 52 Magnetars 52 ecliptic 52 volcanic moon Io 52 prograde 52 earthlike planets 52 primitive meteorites 52 cosmos 52 supermassive stars 52 baryon 52 SCP #F# 52 RRATs 52 gravitational tides 52 spatial dimensions 52 hadrons 52 meteoroid 52 Comet Machholz 52 planetary orbits 52 COROT 7b 52 Gliese #G 52 dust enshrouded 52 Carina constellation 51 equatorial plains 51 Epsilon Indi 51 supernova SN 51 planets circling 51 outermost ring 51 molten magma 51 SN #D 51 Galileo spacecraft 51 cosmic magnifying glass 51 distant quasar 51 axion 51 radioactive nuclei 51 Weakly Interacting Massive Particles 51 Martian dust 51 bedrock outcropping 51 matter antimatter asymmetry 51 Comet Lulin 51 hypervelocity star 51 Comet Tempel 1 51 auroral 51 corona 51 filamentary 51 gamma ray emitting 51 lavas 51 moons JAXA 51 GALEX 51 Higgs boson particle 51 shadowy craters 51 UDFy # 51 SIRTF 51 Goldilocks planet 51 Hawking radiation 51 PSR J# +# 51 HII regions 51 superluminal 51 gravitational tugs 51 atomic nuclei 51 colliders 51 magnetite crystals 51 comet Churyumov Gerasimenko 51 Late Heavy Bombardment 51 highly elliptical orbit 51 scarps 51 quantum particle 51 silicate minerals 51 Elysium Planitia 51 cometary dust 51 supergiant stars 51 orbital eccentricity 51 electrons orbiting 51 lobate scarps 51 meteor impacts 51 tectonically 51 BLG #L 51 BP Piscium 51 orbiting 51 NEAs 51 gamma ray flares 51 YORP effect 51 Alfvén waves 51 Lutetia 51 hypernova 51 extrasolar worlds 51 cosmologists 51 asthenosphere 51 PSR J# 51 Terra Meridiani 51 Samuel Oschin Telescope 51 Terra Sirenum 51 Vastitas Borealis 51 interstellar dust particles 51 GRB # 51 Saturn outermost ring 51 planets astronomers 51 slender crescent 51 assumed planets circling 51 sedimentary deposits 51 Earth magnetotail 51 Spiral galaxies 51 calderas 51 maser emission 51 moon permanently shadowed 51 Pinwheel Galaxy 51 Orientale Basin 51 gravitational wave 51 Hellas Planitia 51 biosignatures 51 optical wavelengths 51 Hyades cluster 51 Saturnian 51 Puppis 51 lava tubes 51 high temperature superconductivity 51 penumbral shadow 51 rotating neutron stars 51 Jupiter Uranus 51 Grillmair 51 chondritic meteorites 51 Phobos 51 OGLE TR #b 51 meteorite fragments 51 volcanic lava flows 51 microlensing events 51 substorm 51 Giovanni Cassini 51 WD5 51 Astronomers 51 tectonic faults 51 relativistic particles 51 extrasolar planetary 51 periodic oscillations 51 potentially habitable 51 cosmic ray particles 51 constellation Pegasus 51 Comet NEAT 51 gaseous envelope 51 Milankovitch cycles 51 electron orbits 51 Bose Einstein condensate 51 southern constellation Carina 51 Viking orbiters 51 Lyman alpha 51 Swift Tuttle 51 spectral fingerprint 51 arcseconds 51 twin Voyager spacecraft 51 HD# [002] 51 planet Nibiru 51 constellation Gemini 51 Halley comet 51 microlensing 51 airglow 51 Hubble Constant 51 Andromeda XII 51 HAT P 51 hydrated silica 51 super perigee moon 51 equatorial 51 theoretical particle 51 Martian crater 51 Orcus Patera 51 Astronomical Units 51 fermions 51 Dwarf Planet 51 Coma Berenices 51 accreting 51 Charon Pluto 51 silicate mantle 51 comet Wild 51 faraway galaxies 50 antineutrinos 50 Quadrantid meteor shower 50 ah dus 50 Mandushev 50 Linda Spilker Cassini 50 nucleons 50 constellation Draco 50 stromatolites 50 comet dust 50 comet Lulin 50 subatomic particle 50 Valles Marineris canyon 50 Gondolo 50 aeolian 50 lunar poles 50 equatorial bulge 50 Hale Bopp 50 subatomic particles 50 planet TrES 50 Antarctic Dry Valleys 50 Endeavour Crater 50 organic molecules 50 moon Phobos 50 planets circling stars 50 Cometary 50 yardangs 50 SNR #-#.# 50 martian 50 KH #D 50 Type Ia 50 pseudogap 50 olivine 50 torus 50 Type 1a supernovae