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(Click for frequent words.) 81 Oort cloud 74 Kuiper belt 69 protoplanetary disk 68 Andromeda galaxy 68 Kuiper Belt 67 photosphere 67 Kuiper Belt Objects 67 Fomalhaut b 67 Milky Way Galaxy 66 Upsilon Andromedae 66 observable universe 66 globular cluster 66 solar nebula 65 galactic disk 65 permanently shadowed craters 65 GJ #b [002] 65 heliopause 65 HD#b 65 WASP #b 65 retrograde orbit 64 elliptical galaxy 64 gaseous planet 64 moon Mimas 64 Eta Carinae 64 Kuiper belt objects 64 Epsilon Eridani 64 comets 64 magnetosphere 64 planets orbits 64 Valles Marineris 64 ejecta 64 interstellar cloud 63 Kuiper Belt Object 63 TrES 4 63 planetary nebulae 63 Gliese #c 63 gravitationally bound 63 Corot 7b 63 constellation Aquarius 63 heliosphere 63 dirty snowballs 63 constellation Ursa Major 63 moonlet 63 KBOs 63 comet nucleus 63 dwarf galaxy 63 GJ #b [001] 63 exosphere 63 Kuiper Belt objects 63 circumstellar disk 63 Virgo Cluster 63 star Proxima Centauri 63 icy moons 62 jovian 62 galaxy 62 comets orbiting 62 planet HD #b 62 Milky Way galaxy 62 heliosheath 62 innermost planet 62 moons orbiting 62 protoplanetary disks 62 starburst galaxy 62 Saturnian moon 62 circumstellar disks 62 galactic cosmic rays 62 lunar crust 62 galactic halo 62 Kuiper Belt object 62 #P/Churyumov-Gerasimenko 62 planetoid 62 cosmic cannibal 62 icy comets 62 galaxy M# [002] 62 interstellar dust 62 Fornax cluster 62 moonlets 61 constellation Carina 61 comet Tempel Tuttle 61 AGNs 61 GJ#b 61 transiting planet 61 distant galaxy 61 Earth radii 61 HD #b [002] 61 magnetar 61 neutron star 61 eclipsing binary 61 Omega Centauri 61 Pluto Charon 61 subsurface ocean 61 protoplanet 61 infall 61 gravitational microlensing 61 comet 61 accretion disk 61 exoplanet orbiting 61 X ray emission 61 Andromeda Galaxy 61 Martian equator 61 Quadrantids 61 interstellar dust grains 61 extrasolar 61 ionized gas 61 Earth magnetosphere 61 planemos 61 asteroidal 61 planetary nebula 61 asteroid belt 61 planets orbiting stars 61 protoplanets 61 CoRoT 7b 61 Antennae Galaxies 61 Cosmic Microwave Background 61 supernova explosion 61 elliptical orbits 61 RY Sagittarii 61 polar craters 61 Phoebe orbits 61 Saturn Enceladus 61 Coma Cluster 60 Earthlike planet 60 Olympus Mons 60 GQ Lupi 60 outer planets 60 Saturn moon Enceladus 60 Syrtis Major 60 trans Neptunian objects 60 Epsilon Aurigae 60 planetesimals 60 elongated orbits 60 Virgo cluster 60 eccentric orbits 60 Quaoar 60 TNOs 60 Comet Lulin 60 exoplanetary 60 Samuel Oschin Telescope 60 HIP #b 60 Wolf Rayet star 60 nebula 60 meteoroids 60 inner Oort Cloud 60 Enceladus 60 inner asteroid belt 60 Upsilon Andromedae b 60 Martian craters 60 sunlike stars 60 protostar 60 constellation Virgo 60 magnetospheric 60 Earthlike planets 60 Comet Tempel Tuttle 60 cometary material 60 galaxy M# [001] 60 CoRoT 9b 60 silicate dust 60 Corot 9b 60 AU Mic 60 galaxy cluster 60 Gliese #g 60 spherical halo 60 nebular 60 circumstellar 60 interstellar medium 60 VY Canis Majoris 59 Hot Jupiters 59 active galactic nucleus 59 moon Enceladus 59 hypervelocity stars 59 Churyumov Gerasimenko 59 lunar craters 59 Jupiter magnetosphere 59 millisecond pulsar 59 red supergiant 59 gravitational interaction 59 Kepler #b 59 constellation Perseus 59 celestial object 59 chromosphere 59 Saturn magnetosphere 59 constellation Sagittarius 59 magma ocean 59 Geminga 59 Neutron stars 59 Shackleton crater 59 planet Uranus 59 Kuiper belt object 59 Triangulum 59 Milky Way 59 rocky planets 59 magnetic reconnection 59 molten magma 59 exoplanets planets 59 exo planets 59 terrestrial planets 59 cosmological distances 59 Milky Way halo 59 accretion disks 59 magnetotail 59 infalling 59 Phaethon 59 Toutatis 59 Saturn rings 59 constellation Centaurus 59 globulars 59 Gravitational waves 59 merging galaxies 59 Sedna 59 Beta Pictoris 59 cometary 59 spiral galaxy NGC 59 comets asteroids 59 interstellar particles 59 CMB radiation 59 blue supergiant 59 magnetic monopoles 59 Fermi telescope 59 asteroids comets 59 celestial sphere 59 constellation Hercules 59 exoplanets orbiting 59 galaxy NGC 59 planets Uranus 59 interstellar dust particles 58 occulted 58 lensing galaxy 58 supermassive black hole 58 moon Io 58 elliptical galaxies 58 Goldilocks planet 58 planets 58 dwarf galaxies 58 asteroids orbiting 58 Proxima Centauri 58 substorm 58 HiRISE image 58 proto planetary disk 58 habitable planets 58 Gliese #e 58 filamentary structure 58 Earth ionosphere 58 Goldilocks zone 58 Venusian atmosphere 58 galaxies 58 supermassive 58 Alfven waves 58 Saturn Cassini 58 lunar perigee 58 coronal mass ejections CMEs 58 Orion nebula 58 Comet Elenin 58 gravitational interactions 58 Hanny Voorwerp 58 Comet Hale Bopp 58 supersymmetric particles 58 globular clusters 58 constellation Leo 58 mesosphere 58 Saturnian 58 Higgs bosons 58 interstellar boundary 58 exosolar planets 58 planet orbits 58 constellation Andromeda 58 perihelion 58 Arabia Terra 58 galactic mergers 58 Wolf Rayet stars 58 gaseous planets 58 planet Gliese #c 58 mantle plumes 58 Solar System 58 SN #A 58 sterile neutrinos 58 Mandushev 58 zodiacal light 58 star Fomalhaut 58 neutralinos 58 superheavy elements 58 HL Tau 58 quantum particle 58 NGC #A 58 planet orbiting 58 extrasolar planetary systems 58 polar vortex 58 filamentary structures 58 constellation Eridanus 58 magnetopause 58 planetoids 58 ejecta blanket 57 basaltic rocks 57 sunlike star 57 cometary dust 57 CoRoT satellite 57 Saturn moon 57 Jovian moon 57 olivine mineral 57 planet magnetosphere 57 spacetime 57 moons Phobos 57 Candor Chasma 57 galaxy clusters 57 planet Gliese #g 57 zodiacal dust 57 constellation Auriga 57 Jovian moons 57 habitable zones 57 impactors 57 Nibiru 57 constellation Ophiuchus 57 BLG #Lb 57 Gerard Kuiper 57 supernova remnant 57 Bug Nebula 57 permanently shadowed 57 planets asteroids 57 CoRoT #b 57 Voorwerp 57 Kepler 9c 57 RS Ophiuchi 57 earthlike planets 57 Iapetus 57 Saturnian moons 57 occultation 57 Magnetars 57 GRB #B 57 constellation Cetus 57 asteroids 57 GRBs 57 constellation Pegasus 57 Cometary 57 transiting planets 57 exo planet 57 interstellar dust clouds 57 sterile neutrino 57 NEAs 57 Perseus Cluster 57 tholins 57 sodium atoms 57 Hellas Basin 57 retrograde orbits 57 solar corona 57 EPOXI spacecraft 57 Crab Nebula 57 X ray binary 57 interstellar space 57 Saturnian system 57 Eagle Nebula 57 galactic bulge 57 spherules 57 extrasolar worlds 57 magnetars 57 stellar nurseries 57 distant supernovae 57 ULIRGs 57 Jupiter moon Io 57 spacecraft flyby 57 Cat Paw Nebula 57 ecliptic plane 57 comet dust 57 supergiant star 57 P/# A2 57 HM Cancri 57 lunar equator 57 planets comets 57 Io volcanoes 57 Beta Pictoris b 57 circular orbits 57 BP Psc 57 interstellar clouds 57 quasars 57 Carina Nebula 57 Cancri e 57 Ontario Lacus 57 SN #gy 57 giant elliptical galaxies 57 smallest exoplanet 57 Earthlike 57 Triangulum Galaxy 57 constellation Cassiopeia 57 cluster NGC 56 Globular clusters 56 asteroid 56 Mimas 56 Comet Hartley 2 56 undersea volcanoes 56 supernova explosions 56 constellation Libra 56 ionized hydrogen 56 Lagoon Nebula 56 Orionids 56 Pleiades cluster 56 Phobos 56 constellation Vulpecula 56 Quadrantid meteor shower 56 Rosette Nebula 56 periodic dimming 56 GRB # 56 Higgs particle 56 globular star 56 cosmic ray particles 56 Tarantula Nebula 56 quasar 56 comet nuclei 56 meteoritic material 56 extrasolar planet 56 baryonic matter 56 reflection nebula 56 meteoroid 56 Itokawa 56 protoplanetary 56 Coma cluster 56 outermost planets 56 Zeta Ophiuchi 56 SIRTF 56 galactic magnetic 56 intrinsic brightness 56 Cosmic rays 56 cosmic ray 56 foreground galaxy 56 energetic electrons 56 cometary debris 56 lunar meteorites 56 prebiotic molecules 56 orbits Saturn 56 QQ# 56 brown dwarfs 56 planets orbiting distant 56 hydroxyl molecules 56 microquasar 56 Comet Halley 56 mineral olivine 56 gravitationally 56 Dumbbell Nebula 56 galactic 56 Veil Nebula 56 cryovolcanism 56 tidally 56 relativistic particles 56 Maunder minimum 56 Comet Holmes 56 tropopause 56 Stephan Quintet 56 star Gliese 56 comet tail 56 active galactic nuclei 56 Valles Marineris canyon 56 orbits 56 axions 56 HD# [002] 56 Comet Hartley 56 nebulae 56 gravitational pulls 56 constellation Scorpius 56 Halley comet 56 brown dwarf 56 silicon monoxide 56 substorms 56 Henize #-# 56 Isidis Planitia 56 gravitational lenses 56 moon Ganymede 56 Earths orbiting 56 planets moons 56 Orion constellation 56 Manned missions 56 asterism 56 Galilean moons 56 XTE J# 56 planet WASP #b 56 Saturn moons 56 PSR B# +# 56 carbonate minerals 56 distant galaxies 56 strange quark 55 extrasolar planetary 55 orbiting 55 binary asteroid 55 interstellar distances 55 Orion Nebula 55 Supernova #A 55 Galileo spacecraft 55 dense clumps 55 Martian dust 55 Gliese #G 55 neighboring Andromeda galaxy 55 occultations 55 redshifted 55 electrons orbiting 55 Swift Tuttle 55 stellar occultation 55 exoplanets planets outside 55 Gemini constellation 55 brightest supernova 55 constellation Taurus 55 aphelion 55 planetary orbits 55 Astrological lore 55 extrasolar planets 55 MG J# +# 55 Alycia Weinberger 55 Pluto Eris 55 galactic cores 55 celestial equator 55 Arsia Mons 55 spiral galaxy 55 Apophis asteroid 55 J# +# [002] 55 interplanetary dust 55 Orionid 55 phyllosilicates 55 proplyds 55 luminous galaxies 55 RX J# 55 Serpens Cauda 55 supermassive black holes 55 planets orbiting 55 potentially habitable planets 55 hot Jupiters 55 Earth asteroids 55 ecliptic 55 coronal holes 55 transiting exoplanet 55 aurorae 55 astronomical objects 55 galactic clusters 55 starburst galaxies 55 Trojan asteroids 55 super Earths 55 TrES 55 subatomic particle 55 pulsar 55 planet HD#b 55 mu Arae 55 millisecond pulsars 55 cosmological theories 55 inhabitable planets 55 heavily cratered 55 GZK cutoff 55 moons Europa 55 arcminutes 55 planetary embryos 55 Wolszczan 55 Bonneville Crater 55 KT boundary 55 Ring Nebula 55 astrophysical objects 55 fainter objects 55 Martian meteorites 55 Cassini flyby 55 prograde 55 Tharsis Rise 55 baryons 55 southern constellation Carina 55 plasmasphere 55 particles WIMPs 55 gravitational tugs 55 Red Rectangle 55 Reiner Gamma 55 outer corona 55 Evolution Explorer 55 coronal mass ejection 55 kaons 55 Neptunian 55 supernova 55 Lake Vostok 55 Quadrantid 55 antineutrinos 55 IRC +# 55 comet McNaught 55 NGC# 55 helium atoms 55 SMBH 55 magma chamber 55 interacting galaxies 55 Chicxulub 55 AB Aurigae 55 southern supercontinent 55 Mercury magnetosphere 55 gamma ray burst 55 grabens 54 Saturn moon Mimas 54 proto cluster 54 Martian crater 54 highly elliptical orbits 54 galactic nuclei 54 gamma ray emission 54 baryon 54 emission nebula 54 celestial bodies 54 submillimeter galaxies 54 Gamma ray bursts 54 Elenin 54 circumstellar dust 54 gravitational perturbations 54 orbital resonance 54 hypernova 54 Sagittarius B2 54 Siberian Traps 54 Crab Pulsar 54 Large Magellanic Cloud 54 G#.# +#.# 54 Lulin 54 Cabeus crater 54 luminosities 54 equatorial bulge 54 Tarantula nebula 54 constellation Lyra 54 carbonaceous chondrite 54 dwarf spheroidal galaxies 54 Epimetheus 54 constellation Bootes 54 boson 54 dwarf spheroidal 54 RQ# 54 lunar poles 54 Solar flares 54 exoplanets 54 Mpc 54 COROT 7b 54 constellation Cygnus 54 stony meteorites 54 Type Ia supernova 54 Gusev crater 54 giant elliptical galaxy 54 gravitational tides 54 Galactic cosmic rays 54 extraterrestrial UFOs 54 supernovae explode 54 strangelet 54 exoplanet 54 North Pacific Gyre 54 Adam Riess 54 noctilucent clouds 54 gravitational waves 54 Gliese #d 54 antimatter particles 54 crystalline silicates 54 meteoroid impacts 54 coronal loops 54 radial velocity 54 planets orbiting sun 54 SMBHs 54 sedimentary deposits 54 Small Magellanic Cloud 54 Caloris 54 nebulosity 54 Orcus Patera 54 Earth magnetotail 54 barred spiral galaxy 54 double helix nebula 54 deep convective clouds 54 constellation Serpens 54 cosmic rays 54 galaxy formation 54 planet Nibiru 54 galactic alignment 54 V# Mon 54 Eridanus 54 electron neutrinos 54 X ray wavelengths 54 Taurids 54 GRB# 54 ringed planet 54 Magellanic Clouds 54 spinning neutron 54 reionization 54 collisional 54 Comet Machholz 54 Yellowstone caldera 54 SNR #-#.# 54 Weakly Interacting Massive Particles 54 supernovae explosions 54 orbiting planets 54 Uranus 54 Jupiter Ganymede 54 moon Charon 54 interstellar grains 54 Tunguska meteorite 54 sized planets orbiting 54 GeV 54 nebula NGC 54 neutrino particles 54 lowermost mantle 54 particle smasher 54 gamma ray observatory 54 Perseus constellation 54 primitive meteorites 54 Nili Fossae 54 Comet Tempel 1 54 Gamma ray burst 54 Super Earths 54 gamma ray emitting 54 electron diffusion 54 weakly interacting 54 orbiting Saturn 54 Methone 53 constellation Coma Berenices 53 binary quasar 53 moons 53 Hawking radiation 53 HD #b [001] 53 Milankovitch cycles 53 IRAS #-# 53 Saturn outermost 53 proto galaxies 53 planet transits 53 Sagittarius dwarf galaxy 53 Astronomical Units 53 auroral displays 53 quantum superposition 53 ionosphere 53 protostars 53 Jenniskens 53 PSR J# 53 neutron stars 53 highly elliptical orbit 53 CoRoT 53 Caloris Basin 53 Meteor showers 53 Bok globules 53 constellation Aquila 53 magnetic polarity 53 YORP effect 53 moon Mab 53 Capricornus 53 filamentary 53 muon neutrinos 53 clathrates 53 lunar highlands 53 primordial ingredients 53 Bullet Cluster 53 Fomalhaut 53 Exoplanets 53 asthenosphere 53 rotational axis 53 habitable worlds 53 Gamma rays 53 plutoid 53 sundog 53 silicate mantle 53 spiral nebulae 53 Trifid Nebula 53 Rossby waves 53 volcanic moon Io 53 radial velocity technique 53 exoplanetary systems 53 nucleosynthesis 53 WIMPs 53 XO 3b 53 gravitational lensing 53 ionized particles 53 moon Deimos 53 Tempel Tuttle 53 baryonic 53 Earth asteroids NEAs 53 Endurance crater 53 COROT exo 3b 53 arcseconds 53 Alpha Centauri 53 extrasolar planets orbiting 53 plutoids 53 Planetary nebulae 53 habitable planet 53 comet Churyumov Gerasimenko 53 melt inclusions 53 radial velocities 53 gravity warps 53 Serpens 53 supersymmetric 53 RRATs 53 type Ia supernova 53 distant galaxy clusters 53 Laser Interferometer Gravitational Wave 53 active volcanism 53 star Spica 53 Nikku Madhusudhan 53 cosmos 53 moon gravitational pull 53 hydrothermal vent 53 Voyager spacecraft 53 distant supernovas 53 PSR J# +# 53 meteor impacts 53 optical wavelengths 53 Cabeus 53 habitable zone 53 Galilean satellites 53 Cepheids 53 dynamical 53 sidereal 53 wrinkle ridges 53 Astrophysicists 53 Magellanic Stream 53 WD5 53 Cancri 53 carbonaceous chondrites 53 missing baryons 53 #gy 53 axion 53 chondrules 53 planetary nebulas 53 gravitational attraction 53 thermonuclear reactions 53 extragalactic 53 dust enshrouded 53 supercontinent 53 synchronous orbit 53 parsecs 53 planetary surfaces 53 shadowed craters 53 lavas 53 Martian volcanoes 53 Solar TErrestrial RElations Observatory 53 quark gluon plasma 53 comet particles 53 tidal bulge 53 martian 53 airglow 53 relativistic jets 53 gamma rays 53 blazar 53 Earthly contamination 53 intraplate 53 radioactive nuclei 53 COROT 53 lunar soil 53 Terra Meridiani 53 flood basalts 53 planetary Transits 53 Comet Churyumov Gerasimenko 53 SDSS II 53 infrared wavelengths 53 Higgs singlet 53 Murchison meteorite 53 Arches Cluster 53 auroral 53 strangelets 53 constellation Gemini 53 torus 53 X ray binaries 53 post perovskite 53 outermost planet 53 Saturn outermost ring 53 coronal mass ejections 53 Oceanus Procellarum 53 geoneutrinos 53 comet Wild 53 cometary impacts 53 slender crescent 53 gravitational keyhole 53 volcano Olympus Mons 53 penumbral shadow 53 constellation Pisces 53 waning crescent Moon 53 dynamical evolution 52 elliptical galaxy NGC 52 shadowy craters 52 supernova remnants 52 IceCube 52 supercontinents 52 Haumea 52 auroral oval 52 helium nuclei 52 Sasselov 52 Asteroid Belt 52 permanently shadowed regions 52 SEGUE 52 Tharsis 52 Helix Nebula 52 Mars Phobos 52 ray Space Telescope 52 biosignatures 52 heliospheric 52 planets circling stars 52 Saturnian moon Titan 52 detect gravitational waves 52 binary asteroids 52 quantum tunneling 52 equatorial regions 52 sunspot 52 comets meteors 52 volcanically active 52 impactor spacecraft 52 Comet #P/Churyumov-Gerasimenko 52 Titan smoggy 52 Fossae 52 red supergiants 52 supernovae 52 pseudogap 52 gluon 52 Rydberg atom 52 Deep Impact eXtended Investigation 52 gravitational lens 52 smoggy atmosphere 52 ultraviolet wavelengths 52 Martian polar 52 Nasa spacecraft 52 bolide 52 tau neutrinos 52 protons collide 52 distant quasar 52 Helix nebula 52 astronomers 52 galactic collisions 52 evaporite deposits 52 Comet NEAT 52 lithosphere 52 Mini TES 52 subglacial 52 quantum particles 52 Aurigid 52 orbital inclination 52 Gondolo 52 chondrites 52 tidal tails 52 cosmic ray collisions 52 diffuse aurora 52 hydrosphere 52 Huygens descent 52 constellation Draco 52 Yarkovsky effect 52 universe 52 galaxy Andromeda 52 constellation Ara 52 Meridiani 52 non baryonic 52 planetesimal 52 Chicxulub Crater 52 geoid 52 protoplanetary disc 52 hadrons 52 midlatitudes 52 distant quasars 52 Puppis 52 radioactive decay 52 unaided eye 52 Gliese 52 Jupiter icy moons 52 Geminid 52 umbra 52 nuclei 52 magmas 52 basaltic lava 52 constellation Orion 52 rocky extrasolar planet 52 Planitia 52 Schrödinger cat 52 Particle physics 52 Bose Einstein condensates 52 Diviner 52 stellar occultations 52 hematite mineral 52 moon Phobos 52 Pieter van Dokkum 52 neutralino 52 Comet Encke 52 magmatic 52 cosmic ray flux 52 gamma rays emitted 52 WHIM 52 volcanic lava flows 52 molten rock 52 comet orbit 52 infalling gas 52 HAT P 52 Nectocaris 52 Leonids 52 muons 52 Epoxi 52 Beehive Cluster 52 EPOXI 52 assumed planets circling 52 galaxies collide 52 Delta Cephei 52 supervolcanoes 52 ionised gas 52 Shackleton Crater 52 martian meteorites 52 interstellar 52 smallest extrasolar planet 52 chondritic meteorites 52 Ulysses spacecraft 52 Lyrids 52 solitons 52 Io Europa 52 Dwarf galaxies 52 Meteor Crater 52 Elysium Planitia 52 undiscovered particle 52 moonquakes 52 subglacial lakes 52 planetary 52 cosmic 52 antiparticle 52 Neptune Uranus 52 Doradus 52 ah dus