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(Click for frequent words.) 65 basaltic rocks 64 Syrtis Major 64 plagioclase 63 heavily cratered 63 chondrites 62 lunar crust 62 Fossae 62 Gusev crater 62 Arabia Terra 62 Oceanus Procellarum 61 Nili Fossae 61 lunar equator 61 moonlet 60 Saturn outermost ring 60 magma ocean 60 Candor Chasma 60 Arsia Mons 60 Milky Way halo 60 phyllosilicate 60 carbonaceous chondrites 60 Comet Halley 60 chondritic meteorites 60 silicate mantle 60 Planitia 60 Reiner Gamma 60 hydrated minerals 60 Asteroid Belt 60 olivine rich 60 Ontario Lacus 59 icy moons 59 retrograde orbit 59 basaltic lava 59 eclogite 59 hydrated silica 59 Terra Sirenum 59 ejecta blanket 59 stony meteorites 59 orbital eccentricity 59 reflection nebula 59 basaltic 59 THEMIS Image 59 lunar meteorites 58 photosphere 58 Shackleton crater 58 cratons 58 Jovian moon 58 lobate scarps 58 gabbros 58 eclogitic 58 chondrules 58 COROT 7b 58 basalts 58 Epsilon Indi 58 post perovskite 58 olivine 58 Valles Marineris 58 moon Mimas 58 silicate dust 58 phyllosilicates 58 Hadley Rille 58 comet nuclei 58 lapilli 58 mineral olivine 58 cratered highlands 58 Veil Nebula 58 Pavonis Mons 58 ferric oxides 57 planetary surfaces 57 silicate minerals 57 lavas 57 ignimbrites 57 isotopic compositions 57 carbonaceous chondrite 57 jovian 57 nebular 57 claystone 57 subsurface ocean 57 Meridiani 57 coarser grained 57 yardangs 57 Saturnian moons 57 martian meteorites 57 lowermost mantle 57 olivines 57 moons Phobos 57 ilmenites 57 goethite 57 Quaoar 57 exosphere 57 Jupiter moon Io 57 kimberlite breccia 57 Kuiper belt objects 57 Terra Meridiani 57 Aram Chaos 57 sulphidic 57 ah dus 57 Tharsis 57 Murchison meteorite 57 Martian equator 57 ignimbrite 57 anorthosite 57 CAIs 57 ionized hydrogen 57 supernova SN 56 Hellas Basin 56 Bug Nebula 56 planet Gliese #g 56 silicic 56 Shackleton Crater 56 Upsilon Andromedae 56 basaltic rock 56 granitoids 56 ejecta 56 Caloris 56 HiRISE image 56 sedimentary deposits 56 Martian meteorites 56 Messinian 56 layered ultramafic 56 Saturn outermost 56 Trifid Nebula 56 S/# [001] 56 tectonically 56 silicates 56 mineral hematite 56 volcanic tuff 56 supergiant stars 56 meteoritic 56 massifs 56 komatiite 56 AU Mic 56 Mpc 56 circumstellar 56 lunar craters 56 Cassini flyby 56 lithosphere 56 lunar magma 56 Kuiper belt 56 crystalline silicates 56 polar mesospheric clouds 56 rubbly 56 spiral nebulae 56 galactic disk 56 Martian craters 56 hematite goethite 56 chondritic 56 pyroxene 56 SN #A 56 Hot Jupiters 55 hematite mineral 55 sulfate salts 55 mesosphere 55 Neoproterozoic 55 dirty snowballs 55 smallest exoplanet 55 Phoebe orbits 55 Tertiary Period 55 flood basalts 55 stellar occultation 55 circumstellar disk 55 constellation Virgo 55 pyroclastics 55 luminous galaxies 55 anisotropy 55 tuffaceous rocks 55 isotopic composition 55 Saturnian moon 55 airglow 55 recrystallized 55 hydrothermal fluid 55 Cosmic Microwave Background 55 Bonneville Crater 55 mantle plumes 55 extrusive 55 gravitational perturbations 55 canali 55 Ring Nebula 55 biotite rich 55 dolomites 55 GJ#b 55 granite gneiss 55 magmas 55 Planum 55 felsic tuff 55 Mars Phobos 55 noctilucent clouds 55 spinels 55 isotope composition 55 asteroidal 55 crustal thickness 55 nebulosity 55 evaporite deposits 55 Elysium Planitia 55 orbital resonance 55 crackle breccia 55 isotopic ratios 55 graphite whiskers 55 Herschel Crater 55 Galileo spacecraft 55 peridotitic 55 solar nebula 55 shadowed craters 55 isotope fractionation 55 telescopic observations 55 constellation Carina 55 Kuiper Belt Objects 55 Lower Jurassic 54 Super Earths 54 magmatism 54 smoothest flattest 54 zodiacal dust 54 protoplanet 54 lunar maria 54 Galilean satellites 54 X ray binaries 54 Omega Nebula 54 Methone 54 spheroidal 54 abyssal plain 54 Voyager spacecraft 54 zodiacal light 54 layered bedrock 54 mineralized mafic 54 spiral galaxy NGC 54 Eagle Nebula 54 comets orbiting 54 KBOs 54 interstellar dust grains 54 regolith 54 Tharsis Rise 54 Horsehead Nebula 54 globulars 54 moon Io 54 Comet Tempel Tuttle 54 isotope ratios 54 Paleozoic carbonate 54 ancient supercontinent 54 geothermal gradient 54 Epsilon Eridani 54 chromosphere 54 Scorpii 54 polar craters 54 carbonaceous material 54 Galilean moons 54 Antarctic Dry Valleys 54 galactic halo 54 Lagoon Nebula 54 Eridani 54 craton 54 spatially resolved 54 magnetic susceptibility 54 basalt volcanic 54 Neogene 54 moon Dione 54 metamorphic rock 54 planetesimals 54 primitive meteorites 54 Saturn Enceladus 54 mineralized intrusive 54 lava tubes 54 constellation Eridanus 54 galaxy M# [002] 54 serpentinized 54 Mössbauer 54 protoplanetary disks 54 andesitic rocks 54 oxygen isotope 54 hydrosphere 54 fine grained sediments 54 silicified zone 54 evaporite 54 cometary material 54 Martian crust 54 asthenosphere 54 Palaeozoic sedimentary 54 constellation Andromeda 54 iridium layer 54 elongated orbits 54 permanently shadowed craters 54 gravity anomalies 53 polar vortex 53 Kasei Valles 53 iron sulphides 53 Maastrichtian 53 abyssal plains 53 Enceladus 53 pyroclastic 53 Jupiter Ganymede 53 Orion nebula 53 outcrop exposures 53 colluvial 53 proplyds 53 tonalite 53 grabens 53 Bullet Cluster 53 clasts 53 planet Uranus 53 Isidis Planitia 53 weakly mineralized 53 starlike object 53 lunar soil 53 Shepherding Spacecraft 53 Oort Cloud 53 crystallites 53 mafic intrusion 53 Orientale Basin 53 Rosette Nebula 53 moonlets 53 Io Europa 53 galactic equator 53 VD# [001] 53 G#.# +#.# 53 silicate rocks 53 Cat Paw Nebula 53 Fomalhaut b 53 southern supercontinent 53 zircon crystals 53 Beta Pictoris 53 Jurassic sandstone 53 Omega Centauri 53 hydrothermal vent 53 oceanic lithosphere 53 CoRoT 7b 53 Ares Vallis 53 manganese oxide 53 Aptian 53 Moho 53 Carbonate rocks 53 mantle convection 53 gaseous planet 53 calcic 53 P/# A2 53 Sinus Meridiani 53 sulphide mineralized 53 Cassini flybys 53 graben 53 IRC +# 53 SNR #-#.# 53 crustal rocks 53 Pleiades cluster 53 turbidites 53 Saturn rings 53 icosahedral 53 exo planets 53 ellipsoidal 53 spherules 53 Siberian Traps 53 Aristarchus 53 penumbral shadow 53 Aurigae 53 galaxy NGC 53 Ray Spectrometer 53 silicate grains 53 Fornax cluster 53 HL Tau 53 circumstellar disks 53 dolerite 53 Vastitas Borealis 53 sunlike stars 53 Outcrops 53 star Spica 53 equatorial latitudes 53 Mini TES 53 stromatolite 53 HII regions 53 sulfidic 53 pyritized 53 Archaean 53 spectroscopically 53 carbonate minerals 53 thin crescent 53 smoggy atmosphere 53 planets Uranus 53 specular reflection 53 basalt rocks 53 volcanoclastic 53 filamentary structures 53 mineralogical composition 52 granitic basement 52 mineralized outcrops 52 chlorite altered 52 QQ# 52 sediments deposited 52 Serpens 52 aeolian 52 olivine crystals 52 Geminga 52 Eridanus 52 retroreflector 52 Helix Nebula 52 carbonaceous shales 52 SNe Ia 52 volcanic moon Io 52 constellation Taurus 52 S/# P2 52 Diviner 52 blue supergiant 52 called lobate scarps 52 CoRoT 52 Magellanic Stream 52 Earthlike 52 moons orbiting Saturn 52 starburst galaxy 52 Crab Nebula 52 continental crust 52 Ithaca Chasma 52 Viking orbiters 52 Wolf Rayet stars 52 basaltic magma 52 oceanic crust 52 meteoritic material 52 PSR B# 52 X ray spectrometer 52 constellation Cetus 52 geochemically 52 supergiant star 52 ecliptic plane 52 Jovian moons 52 interstellar dust clouds 52 Saturn moon Iapetus 52 Dwarf galaxies 52 gibbous 52 GJ #b [001] 52 Utopia Planitia 52 GJ #b [002] 52 Ohmoto 52 pediment gravels 52 kimberlite outcrop 52 ° N 52 protoplanetary disk 52 Bedout 52 interstellar cloud 52 Martian meteorite 52 Saturn Cassini 52 mineralized boulders 52 J# +# [002] 52 Imaging Spectrometer 52 halite 52 Hangingwall 52 colloidal crystals 52 planetary nebulae 52 surface outcrops 52 EW trending 52 Alpha Particle 52 Mossbauer 52 Oort cloud 52 baryonic 52 komatiitic 52 Churyumov Gerasimenko 52 aragonite 52 Evolution Explorer 52 energetic electrons 52 Taurus Littrow 52 VY Canis Majoris 52 Hubble Constant 52 Regolith 52 moonquakes 52 Kraken Mare 52 ALH# 52 slender crescent 52 magnetite crystals 52 Moon Mineralogy Mapper M3 52 carbon spherules 52 arcuate 52 silicon monoxide 52 olivine mineral 52 albedo reflectivity 52 accretion disks 52 Trojan asteroids 52 Monoceros 52 Saturn moon 52 constellation Cassiopeia 52 lobate 52 Trapezium 52 calderas 52 eclipsing binary 52 vein quartz 52 smectite 52 Siple Dome 52 hole CJV 52 Fra Mauro 52 volcaniclastic rocks 52 planetary nebulas 52 Saturn innermost 52 lensing galaxy 52 comet McNaught 52 electron orbitals 52 Giovanni Schiaparelli 52 geochronology 52 inhabitable planets 52 Corot 7b 52 TrES 4 52 perovskite 52 gray hematite 52 Caloris Basin 52 spectroscopic measurements 52 Cydonia region 52 circumstellar dust 52 igneous rock 52 spacecraft orbited 52 Dumbbell Nebula 52 depositional environment 52 fig. S3 52 protoplanetary 52 Olympus Mons 52 zodiac constellations 52 pelitic gneiss 52 polar layered 52 Caloris basin 52 westerly dipping 52 Noachian era 52 Stephan Quintet 52 volcanoclastic rocks 51 siderite 51 Venusian atmosphere 51 Alfven waves 51 emission nebula 51 Viking Lander 51 RX J# 51 magnetotail 51 latite 51 planet Gliese #c 51 luminosities 51 pyrite galena 51 constellation Centaurus 51 basalt 51 giant elliptical galaxies 51 hydrothermal magnetite 51 SN #/#/# [002] 51 constellation Scorpius 51 silicate mineral 51 McMurdo Dry Valleys 51 Navajo Sandstone 51 Hipparcos 51 cryovolcanism 51 active volcanism 51 bedrock outcrops 51 carnotite 51 Martian landscape 51 REE enriched 51 volcanic lava 51 hydrogen isotopes 51 comets asteroids 51 dwarf spheroidal galaxies 51 stromatolites 51 Coma Cluster 51 reentry capsule 51 micron wavelengths 51 Mare Imbrium 51 Shoemaker Levy 51 Saturn moon Enceladus 51 Brunt Ice Shelf 51 proto planetary disk 51 diorites 51 Transantarctic Mountains 51 tholins 51 Tau Ceti 51 NASA Voyager spacecraft 51 silicified outcrops 51 icy crust 51 Orbiter LRO 51 Fig. 1a 51 carbonate formations 51 HD#b 51 filamentary 51 Tempel Tuttle 51 lunar regolith 51 CoRoT satellite 51 Jurassic limestone 51 chalcedonic 51 Valles Marineris canyon 51 horst block 51 loess 51 silicate 51 AGNs 51 Cassini Image 51 Comet Hale Bopp 51 Sedimentary rocks 51 cosmic cannibal 51 hydroxyl molecules 51 Orcus Patera 51 δ 51 vuggy 51 Globular Cluster 51 Cambrian Ordovician 51 planktonic foraminifera 51 Kermadec Arc 51 tropopause 51 Triangulum 51 martian rocks 51 photochemical reactions 51 planets asteroids 51 circular depressions 51 aluminous 51 calcareous sediments 51 infrared spectra 51 iron oxides 51 atmospheric circulations 51 ultramafic intrusives 51 volcanism 51 jarosite 51 hydrocarbon reservoirs 51 Saturnian moon Titan 51 subhorizontal 51 hydrothermally 51 electron density 51 glacial sediments 51 melt inclusions 51 Melas Chasma 51 moon Enceladus 51 Earths crust 51 Taurus Littrow Valley 51 IR spectra 51 Mesoproterozoic 51 silica pyrite 51 gabbro intrusive 51 Foing 51 silica sericite 51 tungsten isotopes 51 Lengai 51 constellation Monoceros 51 magnetic polarity 51 Tarantula Nebula 51 Red Rectangle 51 Saturn Uranus 51 Hellas Planitia 51 ramidus 51 magnesium Mg 51 RS Ophiuchi 51 cometary impacts 51 disseminated pyrrhotite 51 NASA rover Spirit 51 infall 51 speleothems 51 ellipsoid 51 quartz pyrite veins 51 weakly interacting 51 barred spiral galaxy 51 NASA Lunar Prospector 51 hydrothermal fluids 51 Sombrero Galaxy 51 Martian dust 51 prograde 51 Nasa Mars Reconnaissance 51 amphibolites 51 Sagittarius B2 51 mu Arae 51 waxing crescent 51 Titan smoggy 51 Dwarf Galaxies 51 spacecraft flyby 51 lacustrine 51 meteor craters 51 micrometer sized 51 malachite mineralization 51 Ulysses spacecraft 51 fig. S1 51 smoothest flattest spot 51 heliospheric 51 Quadrantid 51 constellation Pisces 51 Saturn moon Mimas 51 magmatic 51 planets orbits 51 Mössbauer spectrometer 51 axial tilt 51 paleochannel 51 Cassini Finds 51 APXS 51 X ray emission 51 binary quasar 51 called gray hematite 51 Astronomers Find 51 meta sedimentary 51 anhydrite 51 solar corona 51 extrasolar 50 chalcedonic silica 50 rhyolite tuff 50 moonlike 50 anticyclonic 50 Geochemical analysis 50 Hale Bopp 50 presolar grains 50 spicule 50 volcanic sediments 50 Exoplanets 50 brecciated silicified 50 Mars Gusev Crater 50 Pluto Charon 50 planetesimal 50 Epimetheus 50 Neptune Uranus 50 Neutron stars 50 collisional 50 red supergiant 50 celestial sphere 50 magma chambers 50 ESO telescope 50 Weddell Sea 50 HW2 50 Martian terrain 50 gravitational redshift 50 supergene mineralization 50 manto mineralization 50 Pole Aitken 50 Fig. 1A 50 pyrite marcasite 50 equatorial regions 50 iron pnictides 50 bedrock outcropping 50 Noctilucent clouds 50 martian 50 Paleocene Eocene 50 Spectroscopic 50 constellation Cygnus 50 Fig. 3B 50 constellation Aquila 50 precessing 50 Mercury magnetosphere 50 dipolar 50 Chryse Planitia 50 unweathered 50 limonitic 50 MG J# +# 50 oxygen isotope ratios 50 Saturn moons Titan 50 Wassonite 50 ultraviolet wavelengths 50 previously undrilled 50 Kuiper Belt objects 50 supersymmetric particles 50 cinder cones 50 Compact Reconnaissance Imaging Spectrometer 50 volcanic vents 50 amphibolite grade 50 rock outcrop 50 Earth radii 50 Plate Tectonics 50 volcano Olympus Mons 50 isotopic measurements 50 Raman spectra 50 Active Galactic Nuclei 50 molten magma 50 SDSS II 50 gravitational tides 50 oligotrophic 50 Serpens Cauda 50 topological defects 50 alluvial plains 50 tectonic activity 50 quartz alunite alteration 50 X ray observatories 50 outwash 50 solidified lava 50 Capricornus 50 Pinwheel Galaxy 50 granitoid 50 Fermi telescope 50 thermally mature 50 moons orbiting 50 martian atmosphere 50 Comet Holmes 50 mantle lithosphere 50 Itokawa 50 magnetic geophysical anomaly 50 mineralized peridotite 50 diffusivity 50 Infrared Thermal Imaging Spectrometer 50 radioactive nuclei 50 fissure eruption 50 felsic rocks 50 Orbiter MRO 50 Klaza Zone 50 aeromagnetic anomaly 50 strange quark 50 NGC #A 50 Balarat Project 50 pyrites 50 globular cluster 50 metal zonation 50 Samuel Oschin Telescope 50 anomalies coincident 50 igneous rocks 50 Clementine spacecraft 50 Epsilon Aurigae 50 abyssal 50 volcanic stratigraphy 50 MOLA 50 planetary nebula 50 carbonate globules 50 Mojzsis 50 gossan zones 50 lunar orbiting spacecraft 50 eccentric orbits 50 Lander robotic arm 50 Cometary 50 constellation Ursa Major 50 equatorial bulge 50 Triangulum Galaxy 50 siliceous sediments 50 ROSAT 50 ancient lava flows 50 polygonal shapes 50 V# Mon 50 spectral measurements 50 Hyades cluster 50 felsic intrusions 50 calcareous sandstone 50 OMS pods 50 shear veins 50 meteoroid impacts 50 mineral apatite 50 intrusive breccias 50 Cabeus crater 50 Cretaceous sandstones 50 Comet 9P/Tempel 1 50 anomalism 50 Doppler measurements 50 martian soil 50 Martian gullies 50 waning gibbous 50 Mini Thermal Emission 50 Pinwheel galaxy 50 lunar meteorite 50 innermost planet 50 distant supernovae 50 Galactic Plane 50 NASA Wilkinson Microwave 50 strange quarks 50 intermetallic compounds 50 globular cluster M# 50 inner moons 50 CoRoT 9b 50 blackbody 50 Noachian 50 Trifid 50 angular boulders 50 compressional 50 quartz feldspar porphyry intrusive 50 X ray binary 50 distant quasars 50 interstellar clouds 50 windblown sand 50 syenite gneiss 50 constellation Aquarius 50 RY Sagittarii 50 NASA rovers Spirit 50 carbonate sediments 50 abundances 50 deep convective clouds 50 Cabeus 50 Uskawanis 50 gravitational lenses 50 circular magnetic anomaly 50 constellation Serpens 50 Spiral galaxies 50 explosive volcanism 50 anticlines 50 fault scarps 50 carboniferous 50 obliquity 50 Pleiades star 50 BIF outcrops 50 vugs 50 Upsilon Andromedae b 50 Astrophysical 50 coronagraph 50 horst 50 ionized gas 50 earths crust 50 Cenomanian 49 Mount Bosavi 49 Shiveluch 49 GQ Lupi 49 magnetic monopoles 49 komatiites 49 stratigraphic sequence 49 Globular clusters 49 boron nitride 49 kaolinite 49 dynamical processes 49 variably silicified 49 Muchachos Observatory 49 crustal 49 northeasterly trending 49 lateritic 49 Casa Berardi Fault 49 rotational axis 49 Convection Rotation 49 Bok globules 49 Planck satellite 49 basalt lava 49 Fig. 2a 49 EPOXI spacecraft 49 volcanic caldera 49 Cepheus 49 coronal mass ejections CMEs 49 inhomogeneous 49 garnet skarn 49 carbon isotopes 49 Mars Pathfinder lander 49 microscopic crystals 49 silicification quartz 49 chlorine monoxide 49 proto galaxies 49 outermost ring 49 gray hematite mineral 49 Virgo Cluster 49 constellation Draco 49 SN#A 49 andesitic volcanic rocks 49 retrograde orbits 49 microcrystals 49 Camelopardalis 49 diffuse aurora 49 diabase dike 49 galactic mergers 49 limestone xenoliths 49 HD# [002] 49 Nasa spacecraft 49 Antiope 49 Earthlike planet 49 orogenic 49 Extrasolar Planets 49 Earth ionosphere 49 waning crescent 49 protoplanets 49 synchronous orbit 49 Miniature Synthetic Aperture Radar 49 Antarctic icecap 49 overlying sandstone 49 subglacial lake 49 BLG #Lb 49 hydrothermal activity 49 giant elliptical galaxy 49 porphyry intrusions 49 lunar orbiters 49 filamentary structure 49 WD5 49 landforms 49 silicified rocks 49 heterogeneities 49 radar interferometry 49 coronal loops 49 biosignatures 49 ferrous oxide 49 calcite crystals 49 mafic intrusives 49 cosmic phenomena 49 polar caps 49 concretions 49 gaseous planets 49 cometary debris 49 morphologies 49 Alycia Weinberger 49 acid leached 49 lava flowed 49 paleomagnetic 49 crestal 49 planetary orbits 49 CMB radiation 49 NASA Cassini 49 deformational 49 hollow cylindrical 49 electromagnetic EM conductors 49 infrared spectral 49 intrinsic brightness 49 Ranging MESSENGER spacecraft 49 synclinal 49 wrinkle ridges 49 Orionids 49 shear modulus 49 alluvial gravels 49 Stromatolites 49 constellation Cepheus 49 silicified andesite 49 oceanic plates 49 Miocene reservoir 49 BIFs 49 Transiting 49 erosional 49 metallicity 49 past boninite lavas 49 Hanny Voorwerp 49 Mossbauer spectrometer 49 chrome diopside 49 Mercury exosphere 49 strontium isotope 49 meteorite fragments 49 Extrasolar Planet 49 phreatic 49 star Beta Pictoris 49 COROT 49 ionized particles 49 Giovanni Cassini 49 felsic dyke 49 volcanic pumice 49 volcanic ridges