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(Click for frequent words.) 72 subsurface ocean 67 Corot 7b 66 Gliese #c 66 Saturn Enceladus 66 Jupiter moon Io 65 Wolszczan 65 magma ocean 65 moon Europa 65 extrasolar 65 GJ #b [001] 65 icy moons 65 moon Enceladus 64 smallest exoplanet 64 Earthlike planets 63 GJ#b 63 Jupiter icy moons 63 lunar craters 63 exoplanetary 63 Galilean satellites 63 Saturnian moon 63 Kuiper Belt Objects 62 permanently shadowed craters 62 COROT 7b 62 moons Phobos 62 polar craters 62 exo planets 62 WASP #b 62 Syrtis Major 62 shadowed craters 61 Upsilon Andromedae b 61 Fomalhaut b 61 Galilean moons 61 inhabitable planets 61 Venusian atmosphere 61 planetoid 61 moons Io 61 CoRoT 9b 61 HD #b [002] 61 gaseous planet 61 Kuiper Belt object 61 Enceladus 61 exosphere 60 cryovolcanism 60 Lake Vostok 60 Martian lander 60 icy crust 60 CoRoT 7b 60 Jovian moons 60 Earthlike planet 60 planet HD #b 60 moons orbiting 60 Saturn moon 60 Saturn moon Enceladus 60 lunar crust 60 Upsilon Andromedae 60 Gliese #d 60 HD#b 60 protoplanet 60 Earthlike 60 Cancri e 60 habitable worlds 60 planet Gliese #g 59 Quaoar 59 extrasolar planet 59 Saturnian moon Titan 59 carbonaceous chondrite 59 Kuiper belt 59 airglow 59 planet Gliese #c 59 elongated orbits 59 TrES 4 59 astrobiological 59 Galileo spacecraft 59 Arsia Mons 59 heavily cratered 59 comets orbiting 59 planets Uranus 59 habitable zones 59 Comet Hale Bopp 59 OGLE TR #b 59 Jupiter moons 59 lunar equator 59 planets orbiting sun 59 retrograde orbit 58 Zeta Ophiuchi 58 Europa Ganymede 58 Super Earths 58 lunar highlands 58 P/# A2 58 Orion nebula 58 astrobiologists 58 moon Io 58 Epsilon Aurigae 58 comets asteroids 58 Hot Jupiters 58 Gliese #g 58 VB #b 58 Cassini flybys 58 liquid ethane 58 Olympus Mons 58 rocky planets 58 habitable planet 58 earthlike 58 zodiacal light 58 interstellar dust grains 58 Shackleton Crater 58 Omega Centauri 58 photosphere 58 Jupiter Ganymede 58 BP Psc 58 hydrated minerals 58 Comet Elenin 58 HiRISE image 58 extrasolar planets orbiting 58 Ontario Lacus 58 Titan Saturn 58 GJ #b [002] 58 sized planets orbiting 58 Io Europa 57 planets orbits 57 Oort Cloud 57 Kraken Mare 57 distant supernovae 57 Higgs particle 57 mantle plumes 57 Kuiper Belt objects 57 Kepler 9c 57 planet Uranus 57 Gliese #G 57 basaltic rocks 57 CoRoT satellite 57 Saturnian system 57 innermost planet 57 Martian meteorites 57 Martian microbes 57 Phoebe orbits 57 missing baryons 57 Gliese #e 57 martian 57 axions 57 neutrino particles 57 interstellar cloud 57 Fermi telescope 57 Saturn Cassini 57 extrasolar worlds 57 sunlike stars 57 sunlike star 57 Cabeus 57 supersymmetric particles 57 KBOs 57 Saturn moons 57 equatorial regions 57 martian meteorites 57 polar vortex 57 constellation Eridanus 57 olivine mineral 57 planetary Transits 57 Gusev crater 57 Oort cloud 57 moonlet 57 moon Mimas 57 SN #C 57 Churyumov Gerasimenko 57 habitable planets 57 orbital resonance 57 Martian rovers 56 Pluto Charon 56 exoplanet orbiting 56 Endurance crater 56 gaseous planets 56 hydroxyl molecules 56 sterile neutrino 56 comet McNaught 56 Hellas Basin 56 radial velocity technique 56 Viking Lander 56 nebular 56 magnetic monopoles 56 Kuiper belt objects 56 transiting planet 56 shadowy craters 56 Martian dust 56 permanently shadowed regions 56 celestial object 56 constellation Hercules 56 Manned missions 56 tholins 56 lunar magma 56 Bonneville Crater 56 smoothest flattest 56 Comet Hartley 2 56 JIMO 56 Mercury magnetosphere 56 Saturn magnetosphere 56 Stephan Quintet 56 accretion disks 56 moon Titan 56 Martian crater 56 BLG #Lb 56 moon Phobos 56 Martian surface 56 cosmic cannibal 56 galactic disk 56 galactic clusters 56 Opportunity rover 56 Planck satellite 56 Pavonis Mons 56 Corot 9b 56 gravity warps 56 star Proxima Centauri 56 Kuiper Belt Object 56 NASA Lunar Prospector 56 Charon Pluto 56 coronal loops 56 Higgs boson particle 56 NEAs 56 axial tilt 56 infrared telescopes 56 circumstellar disk 56 Beta Pictoris b 56 Bug Nebula 56 asteroidal 56 exoplanets orbiting 56 circumstellar disks 56 cosmic phenomena 56 icy comets 55 martian rocks 55 extrasolar planetary systems 55 occultations 55 Asteroid Belt 55 red supergiant 55 asteroids comets 55 lava tubes 55 undersea volcanoes 55 Cassini flyby 55 Higgs bosons 55 martian atmosphere 55 Nili Fossae 55 HL Tau 55 NASA Spirit rover 55 Mandushev 55 gravitational interaction 55 Saturnian moons 55 cometary material 55 Comet Lulin 55 Mars orbiting spacecraft 55 robotic explorer 55 gravitational tides 55 transiting exoplanet 55 planet WASP #b 55 Convection Rotation 55 protoplanetary disk 55 Saturn outermost ring 55 constellation Cetus 55 exo planet 55 volcanic vents 55 supergiant stars 55 superheavy elements 55 Andromeda galaxy 55 ionized hydrogen 55 APXS 55 super Earths 55 Orbiter LRO 55 comet Lulin 55 orbited Jupiter 55 planet magnetosphere 55 smoothest flattest spot 55 subglacial lakes 55 prebiotic molecules 55 HM Cancri 55 dustier stormier atmosphere 55 moonlets 55 MARSIS radar 55 Martian soil 55 celestial sphere 55 meteor fragment 55 jovian 55 HIP #b 55 biosignatures 55 Martian crust 55 diffuse aurora 55 GQ Lupi 55 planetesimals 55 Pleiades cluster 55 Red Planet 55 carbonate minerals 55 Cabeus crater 55 zodiac constellations 55 Saturn rings 55 Comet Halley 55 meteoritic material 55 phyllosilicates 55 AB Aurigae 55 Saturn moons Titan 55 zodiacal dust 55 planet orbiting 55 AU Mic 55 Meridiani 55 exosolar planets 54 Caloris Basin 54 Gamma ray burst 54 Martian rocks 54 Red Rectangle 54 Candor Chasma 54 Wolf Rayet star 54 IRC +# 54 crystalline silicates 54 Martian arctic plains 54 extraterrestial 54 Cosmic Microwave Background 54 circumstellar 54 supergiant star 54 luminous galaxies 54 galaxy M# [002] 54 electron neutrinos 54 yardangs 54 Neutron stars 54 neutralinos 54 Geminga 54 hypervelocity stars 54 galactic cosmic rays 54 jarosite 54 ejecta blanket 54 Shackleton crater 54 gravitational anomalies 54 moons circling 54 mineralogical composition 54 Antarctic Dry Valleys 54 Jupiter moons Europa 54 periodic dimming 54 Antennae Galaxies 54 SN #gy 54 Galactic cosmic rays 54 protoplanets 54 Hanny Voorwerp 54 Ulysses spacecraft 54 Epsilon Eridani 54 Martian terrain 54 Goldilocks planet 54 cosmic collisions 54 Sasselov 54 planetary transits 54 planets orbiting distant 54 outer corona 54 Martian volcanoes 54 tidal bulge 54 molten magma 54 accretion disk 54 Alfven waves 54 protoplanetary 54 Evolution Explorer 54 Pluto Eris 54 Fashion Movie Reviews 54 GRB #B 54 frigid arctic plains 54 terraforming Mars 54 ESA Mars 54 lensing galaxy 54 mesosphere 54 planetary surfaces 54 MG J# +# 54 type Ia supernovae 54 magnetotail 54 spacecraft flyby 54 constellation Cassiopeia 54 orbiting spacecraft 54 comet nuclei 54 moons Europa 54 eclipsing binary 54 Phobos 54 smallest exoplanets 54 mineral olivine 54 Endurance Crater 54 evaporite deposits 54 rocky extrasolar planet 54 cosmological distances 54 Trojan asteroids 54 Mars Gusev Crater 54 equatorial bulge 54 martian surface 54 galactic cores 54 neutralino 54 planets comets 54 volcanoes spewing 54 sub glacial lakes 54 chromosphere 54 binary quasar 54 constellation Carina 54 rotational axis 54 Curiosity rover 54 Planitia 54 Nares Strait 54 moon Mab 54 star Gliese 54 moonquakes 54 blue supergiant 54 Voorwerp 54 interstellar distances 54 solar corona 54 Aram Chaos 54 geoneutrinos 54 cometary debris 54 Titan smoggy 54 noctilucent clouds 54 COROT 54 potentially habitable 54 lowermost mantle 54 baryonic 54 X ray observatory 54 planemos 54 Wolf Rayet stars 53 ammonia hydrates 53 gravitational microlensing 53 Martian equator 53 ejecta 53 stellar nurseries 53 outer planets 53 constellation Aquarius 53 cosmic magnifying glass 53 magnetic monopole 53 Martian permafrost 53 Mars Phobos 53 galaxy M# [001] 53 filamentary structure 53 unmanned probes 53 equatorial plains 53 Mount Bosavi 53 calderas 53 hematite mineral 53 V# Mon 53 TrES 53 lunar meteorites 53 twin Voyager spacecraft 53 basalt volcanic 53 NASA Kepler spacecraft 53 constellation Virgo 53 Yinghuo 1 53 Noctilucent clouds 53 nebulosity 53 millisecond pulsar 53 dusty disks 53 HD# [002] 53 moon Dione 53 planets orbiting stars 53 Neptune Uranus 53 fainter objects 53 Kepler #b 53 antarctic 53 Mini Thermal Emission 53 stony meteorites 53 VY Canis Majoris 53 Nasa spacecraft 53 icy moon Enceladus 53 ah dus 53 nucleosynthesis 53 spherical halo 53 polygon patterns 53 constellation Cygnus 53 bedrock outcropping 53 robotic lander 53 Foing 53 Ring Nebula 53 type Ia supernova 53 biosignature 53 hypervelocity star 53 Lake Cheko 53 gamma ray observatory 53 geologically active 53 silicate dust 53 called gray hematite 53 Virgo Cluster 53 Chicxulub 53 comet nucleus 53 Rossby waves 53 WISE telescope 53 Tau Ceti 53 supervolcanoes 53 Arches Cluster 53 Valles Marineris 53 coronal loop 53 elliptical galaxy 53 chemically reactive salt 53 infalling 53 planet orbits 53 exoplanetary systems 53 planets circling 53 basaltic rock 53 nebula NGC 53 sunward 53 X ray emission 53 substorm 53 spectroscopically 53 active galactic nucleus 53 spacecraft Cassini 53 X ray binaries 53 Deep Impact comet 53 TNOs 53 albedo reflectivity 53 magnetic substorms 53 Samuel Oschin Telescope 53 planetary nebulae 53 astrophysical objects 53 comet 53 Voyager probes 53 HD #b [001] 53 moon Ganymede 53 gaseous envelope 53 silicate mantle 53 Sedna 53 ringed planet 53 melt inclusions 53 galactic bulge 53 elongated orbit 53 Saturn moon Mimas 53 Extrasolar planets 53 reflection nebula 53 SIRTF 53 active volcanism 53 Reiner Gamma 53 rover Sojourner 53 gray hematite 53 Mars 53 X ray wavelengths 53 hydrothermal fluid 53 lunar soil 53 moon Charon 53 Earth magnetosphere 53 Martian craters 53 stellar occultation 53 Sensing Satellite LCROSS 53 planets circling stars 53 Victoria Crater 53 Toutatis 53 chondritic meteorites 53 magma chamber 53 graphite whiskers 53 brightest supernova 53 radial velocity method 53 Earth magnetotail 53 volcanic lava flows 53 distant supernovas 53 Proxima Centauri 52 extraterrestrial civilizations 52 volcanically active 52 Grillmair 52 mud volcanoes 52 Keck Interferometer 52 slender crescent 52 distant galaxy 52 lunar crater 52 Solar TErrestrial RElations Observatory 52 particle smasher 52 smoggy atmosphere 52 polar caps 52 polar regions 52 infrared observatory 52 Mini TES 52 lightest exoplanet 52 McMurdo Dry Valleys 52 volcanic magma 52 gravitational keyhole 52 SN #A 52 terrestrial planets 52 Martian arctic 52 Uranian 52 comet Churyumov Gerasimenko 52 microbial ecosystems 52 asteroid Vesta 52 X ray emitting 52 clathrates 52 satellites orbiting Earth 52 flood basalts 52 hydrologist Carolyn Driedger 52 spinning neutron 52 Martian rover 52 Cepheid variables 52 Sagittarius dwarf galaxy 52 perchlorate salts 52 super perigee moon 52 Tharsis Rise 52 Martian 52 Capricornus 52 infalling gas 52 volcanic moon Io 52 NASA rover Spirit 52 strange quark 52 Milky Way halo 52 Bruce Jakosky 52 Omega Nebula 52 hydrothermal vent 52 Saturn moons Enceladus 52 Mars moon Phobos 52 constellation Andromeda 52 Epoxi 52 Comet #P/Churyumov-Gerasimenko 52 magnetic dynamo 52 specular reflection 52 Magellanic Stream 52 prograde 52 Svedhem 52 EPOXI spacecraft 52 PSR J# 52 Gondolo 52 Kuiper belt object 52 WIMPs 52 galactic mergers 52 constellation Auriga 52 Hubble Space Telescope HST 52 X ray spectrometer 52 muon neutrino 52 Saturn outermost 52 Hawking radiation 52 protoplanetary disks 52 carbonaceous chondrites 52 subglacial 52 Maunder minimum 52 Global Surveyor spacecraft 52 Vastitas Borealis 52 Giovanni Cassini 52 solar nebula 52 robotic landers 52 Opportunity Mars rover 52 COROT exo 3b 52 star Spica 52 V# Sgr 52 Cassini Huygens 52 cometary impacts 52 Lunine 52 BP Piscium 52 permanently shadowed crater 52 hydrosphere 52 Itokawa 52 Isidis Planitia 52 planets 52 Jean Pierre Bibring 52 Martian atmosphere 52 single celled microorganisms 52 blue straggler 52 AGNs 52 gravitational perturbations 52 extragalactic 52 planetary geologists 52 Orcus Patera 52 starquakes 52 Mossbauer spectrometer 52 Rosetta lander 52 Andromeda Galaxy 52 volcano Olympus Mons 52 impactor spacecraft 52 extraterrestrial civilization 52 subatomic particle 52 ultraviolet wavelengths 52 planetary atmospheres 52 intracluster 52 boson 52 orbital inclination 52 sodium atoms 52 Sagittarius B2 52 UDFy # 52 thin crescent 52 Orion constellation 52 undersea volcanic 52 lunar perigee 52 planetoids 52 Martian landscape 52 carbonate globules 52 Triangulum 52 mu Arae 52 filamentary structures 52 comet Hale Bopp 52 stellar occultations 52 spectral fingerprint 52 auroral displays 52 ExoMars rover 52 regolith 51 asteroid 51 X ray telescopes 51 G#.# +#.# 51 lander Beagle 2 51 constellation Lyra 51 Alfvén waves 51 infall 51 Mercury Uranus 51 constellation Scorpius 51 planetesimal 51 asthenosphere 51 celestial phenomena 51 distant galaxy clusters 51 journal Meteoritics 51 masers 51 Nectocaris 51 interstellar clouds 51 # Apophis 51 layered bedrock 51 planet 51 asteroid impacts 51 shadow biosphere 51 Jonathan Lunine 51 polar mesospheric clouds 51 planet habitability 51 Saturn moon Iapetus 51 binary asteroid 51 relativistic particles 51 sea hydrothermal vents 51 proto cluster 51 Saturnian 51 galactic halo 51 gray hematite mineral 51 asteroids Vesta 51 cosmological theories 51 moons orbiting Saturn 51 phyllosilicate 51 Elenin 51 Exoplanets 51 Viking Orbiter 51 Oceanus Procellarum 51 potentially habitable planets 51 #P/Churyumov-Gerasimenko 51 Comet NEAT 51 Peony nebula star 51 SUSY 51 silicates 51 proplyds 51 meteoroid 51 orbital eccentricity 51 CoRoT #b 51 baryonic matter 51 hydrate deposits 51 Rosette Nebula 51 planetary orbits 51 infrared telescope 51 Gravitational waves 51 Pluto dwarf 51 mineral hematite 51 Gakkel Ridge 51 sterile neutrinos 51 mantle convection 51 BepiColombo 51 IBEX spacecraft 51 Exoplanet 51 galaxy NGC 51 magnetar 51 ESA Cluster 51 planetary nebula 51 Gerard Kuiper 51 neutrino detectors 51 exobiology 51 Carina constellation 51 Infrared Astronomical Satellite IRAS 51 Cassini spacecraft orbiting 51 ammonia hydrate 51 smallest extrasolar planet 51 galaxy cluster 51 Sombrero Galaxy 51 inner moons 51 trans Neptunian objects 51 NASA rovers Spirit 51 Huygens mission 51 Fermi paradox 51 sedimentary deposits 51 theoretical particle 51 exoplanet atmospheres 51 Lulin 51 oblate spheroid 51 Terra Meridiani 51 Mars Squyres 51 Stephane Udry 51 rover Opportunity 51 exoplanet 51 superluminal 51 LCROSS mission 51 oceanic crust 51 Magellanic Clouds 51 novas 51 waning crescent 51 Itokawa asteroid 51 interstellar particles 51 deep convective clouds 51 Ithaca Chasma 51 Antarctic icecap 51 Io Europa Ganymede 51 Martian dunes 51 micron wavelengths 51 quantum tunneling 51 earthlike planets 51 Valles Marineris canyon 51 Mimivirus 51 telescopic observations 51 orbiting Hubble Space Telescope 51 silicon monoxide 51 planet Nibiru 51 thermal vents 51 Puijila 51 KH #D 51 solar neutrinos 51 Philae lander 51 lithosphere 51 protostars 51 ostracods 51 Venusian 51 orbits Saturn 51 Submillimeter Array 51 Planetary Transits 51 Terrestrial Planet Finder 51 gamma ray emission 51 HARPS instrument 51 extraterrestrial UFOs 51 Haumea 51 Michael Studinger 51 NASA THEMIS 51 icecap 51 exoplanets planets 51 anorthosite 51 extrasolar planetary 51 Apophis asteroid 51 Earth ionosphere 51 spookfish 51 Odyssey orbiter 51 post perovskite 51 exoplanets 51 Eta Carinae 51 magma chambers 51 Plate tectonics 51 martian soil 51 Mars orbiter 51 volcanic basalt 51 Henize #-# 51 Nibiru 51 Mimas 51 gibbous 51 meteorite crater 51 magnetars 51 spectral fingerprints 51 particle acceleration 51 Bullet Cluster 51 Higgs Boson particle 51 twin rover Spirit 51 Kepler Space Telescope 50 planet TrES 50 Aqua satellite 50 quark gluon 50 inner asteroid belt 50 Delta Cephei 50 emits X rays 50 wrinkle ridges 50 strangelets 50 cosmic ray flux 50 faraway planets 50 magmas 50 silicate rocks 50 proto galaxies 50 SMBH 50 methane hydrates 50 dimming starlight 50 aurorae 50 Veil Nebula 50 CoRoT 50 rubbly 50 galaxies collide 50 Konacki 50 planets atmospheres 50 THEMIS mission 50 extrasolar planets 50 NASA LCROSS 50 interplanetary spacecraft 50 Comet Encke 50 tungsten isotopes 50 aerosol particles 50 merging galaxies 50 thermosphere 50 Quadrantids 50 large oceanic plateaus 50 waxing crescent 50 Goldilocks zone 50 Type Ia supernova 50 katabatic winds 50 Great Orion Nebula 50 neutrino mass 50 Herschel Crater 50 microquasar 50 constellation Pisces 50 Gemini constellation 50 interstellar dust samples 50 lander rover 50 transiting planets 50 XMM Newton 50 Picos de 50 lunar regolith 50 Crab Pulsar 50 ecliptic plane 50 Endeavour Crater 50 protostar 50 Murchison meteorite 50 interstellar grains 50 sulfate salts 50 Voyager spacecraft 50 NASA satellites orbiting 50 cratons 50 Beta Pictoris 50 abyssal plain 50 dwarf spheroidal galaxies 50 Cancri 50 cosmic microwave radiation 50 Earth radii 50 NASA rovers 50 occulted 50 hydrated silica 50 constellation Ursa Major 50 Neptunian 50 Greg Delory 50 binary asteroids 50 asteroids orbiting 50 GRB # 50 outermost planets 50 spectroscopic measurements 50 Epimetheus 50 constellation Aquila 50 southern supercontinent 50 retrograde orbits 50 Hematite Slope 50 Titan flyby 50 supernova explosion 50 dwarf galaxy 50 distant quasars 50 orbiting Saturn 50 magma boiling 50 Diviner instrument 50 superheavy element 50 Ganymede 50 -# degrees centigrade [001] 50 reentry capsule 50 brown dwarf 50 planetary embryos 50 dense clumps 50 Supernova #A 50 Jakosky 50 lunar poles 50 planetary 50 origins spectrograph 50 hydrocarbon haze 50 Huygens probe landed 50 starlike 50 Tarantula Nebula 50 Virgo cluster 50 hydrogen isotopes 50 Gamburtsev 50 PSR B# +# 50 J# +# [002] 50 clumpiness 50 elliptical orbits 50 Eta Aquarid meteor shower 50 Saturn icy moons 50 waning crescent Moon 50 ionized particles 50 Comet Machholz 50 Mud volcanoes 50 alien beings 50 ESA XMM Newton 50 Butterfly Nebula 50 Huygens descent 50 Express orbiter 50 coronal heating 50 cometary 50 Methone 50 Epsilon Indi 50 interstellar dust 50 constellation Draco 50 brown dwarfs 50 asteroid collisions 50 planets moons 50 Saturn Uranus 50 Dumbbell Nebula 50 Helix nebula 50 basaltic lava 50 retroreflector 50 rover Spirit 50 Planetary nebulae 50 olivines 50 astrophysical phenomena 50 magma molten rock 50 Milky Way Galaxy 50 hexagonal mirrors 50 panspermia 50 eccentric orbits 50 GLAST telescope 50 faintest galaxies 50 pre biotic 50 constellation Centaurus 50 constellation Sagittarius 50 alien civilizations 50 radioactive nuclei 50 magnetic reconnection 50 subatomic scale 50 spiral galaxy NGC 50 dust mote 50 rock outcrop 50 -# degrees Fahrenheit [002] 50 submillimeter galaxies 50 Mercury exosphere