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(Click for frequent words.) 63 ejecta 62 protoplanetary disk 61 Saturnian moon 61 planet Uranus 60 planets orbits 60 retrograde orbit 60 gaseous planet 59 galactic disk 59 solar nebula 59 comet 59 Mimas 58 protoplanet 58 Saturnian moons 58 moonlet 58 galaxy cluster 58 magma ocean 58 heavily cratered 58 Phoebe orbits 58 Syrtis Major 58 HD#b 58 photosphere 58 Epsilon Eridani 58 substorm 57 moons orbiting 57 Kuiper belt 57 Saturn rings 57 Andromeda galaxy 57 Corot 7b 57 Upsilon Andromedae 57 blue supergiant 57 elongated orbits 57 Oort Cloud 57 planet orbiting 57 icy moons 57 magnetic polarity 57 X ray emission 57 perihelion 57 polar vortex 57 protoplanets 57 magnetotail 57 P/# A2 57 Beta Pictoris 57 AB Aurigae 57 gravitational interaction 56 Kuiper belt objects 56 distant galaxy 56 interstellar dust 56 solar corona 56 gravitational interactions 56 TrES 4 56 lunar crust 56 cometary 56 moon Io 56 proplyds 56 moon Iapetus 56 CoRoT 7b 56 Enceladus 56 meteoroids 56 comets orbiting 56 Martian dust 56 galaxy NGC 56 magnetospheric 56 circumstellar 56 comet nucleus 56 Fomalhaut b 56 lithosphere 56 Saturn moon Iapetus 56 WASP #b 56 Oort cloud 55 foreground galaxy 55 planetesimals 55 magnetar 55 HD #b [002] 55 accretion disk 55 infall 55 mesosphere 55 circumstellar disk 55 red supergiant 55 orbits Saturn 55 supergiant star 55 neutron star 55 gamma ray burst 55 RS Ophiuchi 55 aurorae 55 AU Mic 55 interstellar medium 55 supernova explosion 55 Sedna 55 protoplanetary disks 55 proto planetary disk 55 lensing galaxy 55 Saturnian system 55 constellation Cassiopeia 55 supernova remnant 55 constellation Virgo 55 jovian 55 heliosheath 55 yardangs 54 magnetic reconnection 54 Comet Holmes 54 planets Uranus 54 nebula 54 barred spiral galaxy 54 spiral galaxy NGC 54 Andromeda Galaxy 54 innermost planet 54 noctilucent clouds 54 exoplanetary 54 comets 54 Valles Marineris 54 Comet Hartley 2 54 Jupiter magnetosphere 54 Earth magnetosphere 54 Veil Nebula 54 Eta Carinae 54 icy comets 54 coronal loops 54 planet orbits 54 rotational axis 54 exosphere 54 Kuiper Belt Objects 54 magnetic monopoles 54 Saturn magnetosphere 54 nebular 54 meteoroid 54 Milankovitch cycles 54 starburst galaxy 54 Gusev crater 54 Galilean moons 54 elliptical galaxy 54 constellation Hercules 54 spiral galaxy 54 corona 54 spacetime 54 SN #A 54 gravitational lens 54 Cassini flyby 54 asthenosphere 53 Toutatis 53 extrasolar 53 galactic cosmic rays 53 interstellar dust grains 53 protostar 53 moon Ganymede 53 constellation Sagittarius 53 comet tail 53 millisecond pulsar 53 supercontinent 53 Epsilon Aurigae 53 heliosphere 53 KBOs 53 COROT 7b 53 SN#A 53 galaxies 53 YORP effect 53 permanently shadowed craters 53 meridional flow 53 Io volcanoes 53 Saturn moon Enceladus 53 magnetosphere 53 merging galaxies 53 quasar 53 moon Enceladus 53 V# Mon 53 spacecraft flyby 53 BLG #Lb 53 Bullet Cluster 53 Comet Halley 53 lavas 53 Coma Cluster 53 Kuiper belt object 53 KH #D 53 VY Canis Majoris 53 Upsilon Andromedae b 53 Comet Hale Bopp 53 NASA Voyager spacecraft 53 Gliese #e 53 Trifid Nebula 53 GJ#b 53 asteroid Vesta 53 Saturn moon 53 pulsar 53 coronal mass ejections CMEs 53 supermassive black hole 53 planetary nebulae 53 Arabia Terra 53 distant galaxies 53 zodiacal light 53 GRB # 53 Ring Nebula 53 chondrules 53 GRB #B 53 constellation Aquarius 53 Kepler #b 53 NASA Cassini spacecraft 53 Cassini 53 Helix Nebula 53 volcanism 53 interstellar cloud 53 albedo reflectivity 53 Milky Way Galaxy 53 comet Tempel Tuttle 52 Saturn Enceladus 52 Adam Riess 52 Candor Chasma 52 Orion Nebula 52 silicate dust 52 asteroidal 52 chromosphere 52 planetoid 52 supervolcanoes 52 Galileo spacecraft 52 Methone 52 Virgo Cluster 52 Bok globules 52 interstellar clouds 52 slender crescent 52 Martian meteorites 52 lunar equator 52 GJ #b [002] 52 luminous galaxies 52 transiting planet 52 Hellas Basin 52 Kuiper Belt objects 52 Kuiper Belt object 52 visible wavelengths 52 terrestrial planets 52 DISR 52 HL Tau 52 Omega Centauri 52 phyllosilicates 52 Comet Tempel Tuttle 52 Olympus Mons 52 meteorite impacts 52 CoRoT satellite 52 martian atmosphere 52 Comet Lulin 52 binary quasar 52 Cassini imaging 52 sun corona 52 Gliese #c 52 asteroids 52 rocky planets 52 Meridiani 52 COROT 52 auroral 52 Diviner 52 muon 52 Bug Nebula 52 Antennae Galaxies 52 ionized gas 52 nebulosity 52 distant supernovae 52 ejecta blanket 52 Alfven waves 52 Earthlike 52 Cassini Huygens spacecraft 52 Hot Jupiters 52 galactic halo 52 muon neutrino 52 Saturn moons 52 Fermi telescope 52 polar craters 52 GJ #b [001] 52 Tharsis Rise 52 hydrated minerals 52 colliding galaxies 52 SN #gy 52 basaltic rocks 52 Tempel 1 51 Solar System 51 electron neutrinos 51 Comet 9P/Tempel 1 51 elliptical orbits 51 Arsia Mons 51 Saturnian 51 moon Mimas 51 circumstellar disks 51 OGLE TR #b 51 eccentric orbits 51 KT boundary 51 HD# [002] 51 continental crust 51 HiRISE image 51 sodium atoms 51 Gravitational lensing 51 constellation Ursa Major 51 impactors 51 planet magnetosphere 51 brightest supernova 51 GALEX 51 galaxy M# [002] 51 spherically symmetric 51 Carina Nebula 51 cosmic rays 51 sunward 51 Arctic Oscillation 51 zodiacal dust 51 outer corona 51 HiRISE camera 51 Large Magellanic Cloud 51 polar caps 51 planetary nebula 51 galaxy M# [001] 51 circular orbits 51 Haumea 51 dwarf galaxy 51 Muchachos Observatory 51 optical wavelengths 51 comet McNaught 51 atomic nuclei 51 Saturn moon Mimas 51 constellation Perseus 51 type Ia supernova 51 silicates 51 helium atoms 51 magnetopause 51 supernova explosions 51 Yarkovsky effect 51 planet Gliese #c 51 Solar TErrestrial RElations Observatory 51 infalling 51 cryovolcanism 51 wrinkle ridges 51 de Pater 51 Triangulum 51 lowermost mantle 51 cosmic magnifying glass 51 X ray wavelengths 51 Milky Way galaxy 51 elongated orbit 51 Ringed Planet 51 celestial sphere 51 Orion nebula 51 superfluid 51 stellar occultation 51 supernova 51 orbital eccentricity 51 muons 51 Martian volcanoes 51 proto galaxies 51 neutron stars 51 collisional 51 volcanic moon Io 51 accretion disks 51 Comet NEAT 51 Jupiter Saturn 51 celestial object 51 tholins 50 antiprotons 50 atomic particles 50 post perovskite 50 Pluto Charon 50 quasicrystal 50 Earth radii 50 sedimentary rock 50 Martian craters 50 galaxy clusters 50 Jupiter moon Io 50 exoplanet orbiting 50 gravitational tugs 50 GRBs 50 moon Titan 50 Voyager spacecraft 50 gravitational pulls 50 Kuiper Belt Object 50 star Proxima Centauri 50 Magellanic Stream 50 Wilkinson Microwave Anisotropy Probe 50 glacial cycles 50 mid latitudes 50 Quaoar 50 comet orbit 50 sulfur isotope 50 diffraction patterns 50 Shackleton crater 50 cosmic microwave background 50 constellation Centaurus 50 exoplanets planets 50 XMM Newton 50 ecliptic plane 50 kaons 50 extrasolar planets 50 airglow 50 binary asteroid 50 distant quasar 50 hydrogen helium 50 interacting galaxies 50 sunspot cycle 50 ionized hydrogen 50 AGNs 50 reflection nebula 50 axions 50 interstellar boundary 50 Spitzer Space Telescope 50 Cassini Regio 50 NASA QuikScat satellite 50 Composite Infrared Spectrometer 50 basaltic lava 50 Gravitational waves 50 cometary dust 50 icy crust 50 Itokawa 50 moons Phobos 50 Noctilucent clouds 50 lunar perigee 50 lunar meteorites 50 Type Ia supernova 50 Crab Pulsar 50 mantle plumes 50 Galilean satellites 50 midlatitudes 50 Earthlike planets 50 Epimetheus 50 Uranus 50 moon Mab 50 asterism 50 Corot 9b 50 Martian crater 50 elliptical galaxies 50 ringed planet 50 occulted 50 rifting 50 Caloris 50 substorms 50 extrasolar planet 50 gravitationally 50 outer planets 50 WMAP 50 Jupiter Ganymede 50 energetic electrons 50 Krimigis 50 protostars 50 brown dwarf 50 quark gluon plasma 50 Comet Tempel 1 50 Eagle Nebula 50 electron orbits 50 planets comets 50 Wolf Rayet star 50 moons circling 50 bosonic 50 Lulin 50 nuclei 50 Extrasolar planets 50 planets moons 50 magnetic dynamo 50 colliding protons 50 Saturn Cassini 50 J# +# [002] 50 galactic clusters 50 exoplanet 50 millisecond pulsars 50 globular cluster 50 penumbral shadow 50 Virgo cluster 50 Fornax cluster 50 planets 50 Bose Einstein condensates 50 star Beta Pictoris 50 equatorial regions 50 Nasa spacecraft 49 TrES 49 G#.# +#.# 49 De Pontieu 49 starlike object 49 arcminutes 49 cosmic ray 49 Churyumov Gerasimenko 49 moon Charon 49 Taurids 49 albedo 49 star Spica 49 Ulysses spacecraft 49 Quadrantids 49 neutrino 49 transiting planets 49 SN #C 49 Jupiter moons Europa 49 emit X rays 49 auroral displays 49 lunar craters 49 oceanic crust 49 Maunder minimum 49 Martian surface 49 Neukum 49 Trojan asteroids 49 stellar occultations 49 axial tilt 49 Spitzer infrared spectrograph 49 undersea volcanoes 49 GQ Lupi 49 convective 49 cometary impacts 49 Zeta Ophiuchi 49 dirty snowballs 49 Gliese #g 49 crystalline silicates 49 spherules 49 baryon 49 Cryogenian 49 planets asteroids 49 distant quasars 49 spiral galaxies 49 Comet Hartley 49 submillimetre wavelengths 49 XO 3b 49 eclipsing binary 49 Henize #-# 49 constellation Cetus 49 occultations 49 Lagoon Nebula 49 constellation Andromeda 49 sunlike star 49 planet Gliese #g 49 Cassini flybys 49 Helix nebula 49 Deep Impact craft 49 precessing 49 atoms 49 filamentary structures 49 hot Jupiters 49 Venusian atmosphere 49 Viking orbiters 49 Cassini spacecraft 49 anticyclonic 49 Hanny Voorwerp 49 planetesimal 49 Ontario Lacus 49 equator 49 Fomalhaut 49 sunlike stars 49 Cabeus crater 49 cosmic ray flux 49 matter antimatter asymmetry 49 VIRTIS 49 Galaxy Evolution 49 geologically active 49 inner asteroid belt 49 Microlensing 49 outer layers 49 elemental abundances 49 arcseconds 49 protoplanetary discs 49 martian surface 49 Planitia 49 redshifted 49 exoplanets orbiting 49 planetary nebulas 49 moon gravitational pull 49 Comet Elenin 49 HD #b [001] 49 moonlets 49 observable universe 49 Mini TES 49 greenhouse warming 49 Astrophysicists 49 hydroxyl molecules 49 coronal mass ejection 49 IBEX spacecraft 49 gamma ray emission 49 heliopause 49 Saturnian moon Titan 49 Messenger spacecraft 49 supernova remnants 49 subsurface ocean 49 smallest exoplanet 49 subatomic particles 49 Mauna Kea Hawaii 49 mineral olivine 49 spacecraft Cassini 49 constellation Taurus 49 diffraction pattern 49 primitive meteorites 49 dense clumps 49 planet HD #b 49 atmospheric circulation 49 magnetic excitations 49 supernovae 49 auroras 49 volcanically active 49 tectonically 49 quantum particle 49 gravitational lensing 49 Saturn equinox 49 NGC# 49 comet Tempel 1 49 particle beams 49 antimatter particles 49 filamentary 49 proto cluster 49 YU# 49 active galactic nuclei 49 comet Hartley 2 49 moon permanently shadowed 49 chondrites 49 Terra Sirenum 49 celestial equator 49 polar icecap 49 cometary debris 49 Tharsis 49 UDFy # 49 strange quark 49 spicules 49 faintest galaxies 48 Elysium Planitia 48 X ray pulses 48 dwarf galaxies 48 carbonaceous chondrite 48 ray Space Telescope 48 landmasses 48 B mesons 48 reionization 48 Martian atmosphere 48 Higgs bosons 48 ultraluminous galaxy 48 #P/Churyumov-Gerasimenko 48 quasars 48 Scheila 48 Ranging spacecraft 48 Crab Nebula 48 CMB radiation 48 Great Conveyor Belt 48 Comet Shoemaker Levy 48 electron ion 48 Geminid meteors 48 gamma ray bursts 48 coronal loop 48 Eridani 48 cometary material 48 galactic mergers 48 Cat Paw Nebula 48 Samuel Oschin Telescope 48 protoplanetary 48 antineutrinos 48 highly elliptical orbit 48 CoRoT 48 silicon monoxide 48 Kasei Valles 48 Kepler 9c 48 lobate scarps 48 cratons 48 Monoceros 48 subatomic particle 48 neutrinos 48 Reiner Gamma 48 positrons 48 gravitationally bound 48 antiferromagnets 48 gravitational tides 48 Voorwerp 48 Rossby waves 48 Cancri e 48 baryonic 48 Venusian 48 Jovian moon 48 constellation Eridanus 48 comets asteroids 48 comet Wild 48 Bose Einstein Condensate 48 planets orbiting stars 48 supersymmetric particles 48 backscattered 48 giant elliptical galaxy 48 gamma ray photons 48 shorter wavelengths 48 asteroid 48 mu Arae 48 RXTE 48 Proxima Centauri 48 photon energies 48 mantle convection 48 Astrophysical 48 cirrus clouds 48 Opportunity rover 48 ultracold atoms 48 aphelion 48 Cepheids 48 Agulhas Current 48 sterile neutrino 48 regolith 48 neutralinos 48 circumstellar dust 48 Mars Phobos 48 SNR #-#.# 48 Descent Imager Spectral Radiometer 48 Cassini ion 48 Atlantic Multidecadal Oscillation 48 exoplanetary systems 48 Arches Cluster 48 Beta Pictoris b 48 Neutron stars 48 Compact Reconnaissance Imaging Spectrometer 48 Tycho supernova remnant 48 ultraviolet wavelengths 48 troposphere 48 Martian dunes 48 oxygen isotopic 48 Bonneville Crater 48 deep convective clouds 48 equatorial 48 magnetars 48 MG J# +# 48 sundog 48 Milky Way halo 48 Martian terrain 48 ULIRGs 48 intrinsic brightness 48 planets orbiting 48 volcanic plumes 48 Evolution Explorer 48 perigee 48 super Earths 48 galaxy 48 Hawking radiation 48 astronomical objects 48 spheroidal 48 Halley comet 48 Mercury flyby 48 NASA Wilkinson Microwave 48 exo planets 48 molten magma 48 Geminids 48 Mössbauer 48 geyser plumes 48 Gliese #d 48 Kuiper Belt 48 Higgs singlet 48 thermohaline circulation 48 cosmic cannibal 48 antiparticles 48 type Ia supernovae 48 Astrophysics Cambridge Mass. 48 periodicities 48 exoplanets 48 Jupiter Saturn Uranus 48 interstellar dust clouds 48 torus 48 Gamma rays 48 scarps 48 exo planet 48 Earth magnetotail 48 rotating neutron stars 48 RQ# 48 HIP #b 48 Cosmic Microwave Background 48 molten rock 48 outermost planets 48 Southern Oscillation 48 Pavonis Mons 48 called lobate scarps 48 constellation Monoceros 48 ionized particles 48 Svensmark 48 Isidis Planitia 48 polarimetry 48 interstellar magnetic 48 Butterfly Nebula 48 ferric oxides 48 earthshine 48 Comet Machholz 48 Ares Vallis 48 Orionid 48 Red Rectangle 48 planemos 48 Mars CRISM 48 gravitational lenses 48 crustal thickness 48 arcsecond 48 Milky Way 48 RY Sagittarii 48 Mpc 48 NASA rovers Spirit 48 asteroids comets 48 constellation Carina 48 antiparticle 48 Aram Chaos 48 double helix nebula 48 martensite 48 spinning clockwise 48 silicate minerals 48 gravitational attraction 48 martian 48 Giovanni Cassini 48 Geminga 48 horseshoe shaped crater 48 moons orbiting Saturn 48 comet Lulin 48 Goldilocks planet 48 CAIs 48 cratered highlands 48 olivine mineral 48 Comet McNaught 48 tidal tails 48 superluminal 48 orbiting Hubble Space Telescope 48 emission nebula 48 oblate spheroid 48 layered outcrops 48 SIRTF 48 Alfvén waves 48 Nili Fossae 48 Phobos 48 meteor impacts 47 planetoids 47 Jovian moons 47 Mars Orbiter Camera 47 Cassini spacecraft orbiting 47 novae 47 boson 47 smoggy atmosphere 47 gamma rays 47 Oscillations 47 periodic dimming 47 sized planets orbiting 47 THEMIS Image 47 star Gliese 47 galactic bulge 47 bolide 47 thermosphere 47 Uranian 47 submillimeter galaxies 47 tidally 47 HM Cancri 47 MESSENGER 47 orbiting 47 Carina constellation 47 Cerro Paranal 47 moon Dione 47 Perseus cluster 47 faraway galaxies 47 constellation Gemini 47 gyre 47 Alycia Weinberger 47 anisotropic 47 proton proton 47 Triangulum Galaxy 47 astronomers 47 Grillmair 47 inner moons 47 outermost layers 47 constellation Leo 47 spiral nebulae 47 Saturn Jupiter Uranus 47 Gondwanaland 47 IceCube 47 particles WIMPs 47 Quadrantid meteor shower 47 electron density 47 EPOXI spacecraft 47 lunar highlands 47 Planetary nebulae 47 ESO PR 47 Hubble Space Telescope HST 47 Herschel Space 47 quantum tunneling 47 obliquity 47 planet WASP #b 47 Quadrantid 47 Martian polar 47 Martian equator 47 basalt 47 Herschel telescope 47 Orionids 47 WMAP satellite 47 GRB# 47 shadowy craters 47 Neutron Detector 47 Murchison meteorite 47 Viking Lander 47 infrared wavelengths 47 HiRISE 47 impactor spacecraft 47 galactic magnetic 47 Io Europa 47 superlens 47 geoneutrinos 47 Tarantula Nebula 47 dinosaur extinction 47 Kepler 9b 47 martian soil 47 Chicxulub 47 comet Churyumov Gerasimenko 47 Martian landscape 47 anticyclones 47 Palaeocene Eocene Thermal Maximum 47 asteroid belt 47 globular star 47 olivine 47 solar neutrinos 47 Omega Nebula 47 APXS 47 gravitational microlensing 47 Shoemaker Levy 47 icesheet 47 extrasolar planetary systems 47 wavefunction 47 protons 47 ancient supercontinent 47 Orbiter LRO 47 silicate mantle 47 galaxy formation 47 volcanoes spewing 47 axis wobbles 47 detect gravitational waves 47 blazar 47 dipolar 47 constellation Scorpius 47 Ithaca Chasma 47 energetic gamma rays 47 imaging spectrometer 47 IRAS 4B 47 Infrared Mapping Spectrometer VIMS 47 Aurigae 47 Pieter van Dokkum 47 Betelgeuse 47 topological defects 47 CoRoT 9b 47 Saturn Uranus 47 hydrogen nuclei 47 tropopause 47 tidally locked 47 globulars 47 arcsec 47 pulsars 47 Wolf Rayet stars 47 explosive volcanism 47 infrared spectra 47 microlensing 47 planetary orbits 47 Stephan Quintet 47 tau neutrinos 47 reddish orange hue 47 graphite whiskers 47 Carolyn Porco 47 stony meteorites 47 HESS telescopes 47 retroreflector 47 electron neutrino 47 VB #b 47 Imke de 47 weak gravitational lensing 47 comet Hale Bopp 47 emits X rays 47 relativistic particles 47 moonquakes 47 fainter objects 47 dwarf spheroidal 47 comet dust 47 glaciation 47 Relations Observatory STEREO 47 Phaethon 47 habitable zones 47 chondritic 47 Rosette Nebula 47 carbonate minerals 47 ENAs 47 Pleiades star 47 Corona Australis 47 Laurentide ice sheet 47 Earth ionosphere 47 neutrino mass 47 Planck satellite 47 X ray telescopes 47 grabens 47 Submillimeter Array 47 BP Piscium 47 XTE J# 47 micrometer scale 47 Pleiades cluster 47 trans Neptunian objects 47 B meson 47 waxing gibbous moon 47 eyewall 47 Moderate Resolution Imaging 47 cirrus cloud 47 Milankovitch 47 equatorial plains 47 brown dwarfs 47 particle acceleration 47 Cosmologists 47 strange quarks 47 hydrated silica 47 Saturn moons Titan 47 hypervelocity stars 47 X ray emitting 47 cosmological distances 47 WISE telescope 47 Anisotropy Probe 47 Hellas Planitia 47 outer crust 47 NASA Cassini 47 submillimeter wavelengths 47 constellation Lyra 47 electron beams 47 Saturn aurora 47 ESO Very Large Telescope 47 Planck spacecraft 47 NASA Chandra