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(Click for frequent words.) 60 shadowed craters 60 Martian craters 60 crossbedding 59 cryovolcanism 58 polar craters 58 lunar crust 57 comet nuclei 57 lunar magma 56 meteor impacts 56 phyllosilicates 56 Martian volcanoes 56 McMurdo Dry Valleys 56 Gusev crater 56 basaltic rocks 56 Maunder minimum 55 HiRISE images 55 Candor Chasma 55 subglacial 55 ferric oxides 55 Saturn moon Enceladus 55 sedimentary deposits 55 Meridiani 55 Amundsen Sea Embayment 55 Ares Vallis 54 ejecta blanket 54 Athabasca Valles 54 moon Enceladus 54 surface hoar 54 Ontario Lacus 54 icy comets 54 Martian dunes 54 Antarctic glaciers 54 molten magma 53 subglacial lakes 53 sediments deposited 53 Ulysses spacecraft 53 NASA Spirit rover 53 mantle plumes 53 paleomagnetic 53 mineral olivine 53 Nature Geosciences 53 Sinus Meridiani 53 asteroidal 53 Cassini flybys 53 X ray afterglow 53 basaltic lava 53 permanently shadowed craters 53 overlying layers 53 polar vortex 53 NASA Opportunity rover 53 cratons 53 Saturn rings 53 HiRISE image 53 martian meteorites 53 isostatic rebound 53 moonquakes 53 Saturn moon 53 lunar craters 53 icy moons 53 cosmic collisions 52 meteorite bombardment 52 martian rocks 52 Elysium Planitia 52 speleothems 52 scarps 52 concretions 52 solar prominences 52 jarosite 52 fault scarps 52 journal Geology 52 polar caps 52 Grillmair 52 Martian landscape 52 journal Icarus 52 microfossil 52 magma ocean 52 yardangs 52 lake sediments 52 called lobate scarps 52 meteoritic 52 receding glacier 52 Clementine spacecraft 51 proplyds 51 crustal thickness 51 melting glacial 51 Reiner Gamma 51 fractal patterns 51 infalling gas 51 Yellowstone supervolcano 51 spherules 51 Kraken Mare 51 Arsia Mons 51 hydrated minerals 51 proto planetary disk 51 receding glaciers 51 Tagish Lake meteorite 51 noctilucent clouds 51 Syrtis Major 51 ALH# 51 heavily cratered 51 lobate scarps 51 lava tubes 51 abyssal plains 51 chondrules 51 NASA Cassini spacecraft 51 asteroid impacts 51 Valles Marineris 51 Noachian 51 Chasma Boreale 51 Ithaca Chasma 51 ionized hydrogen 51 ancient lava flows 51 Kilimanjaro glaciers 51 dense clumps 51 turbidites 51 icesheets 51 landforms 51 polygon shaped 51 nebulosity 51 subsurface ocean 51 seafloors 50 icy crust 50 tectonic plate movements 50 biosignatures 50 Martian dust 50 layered outcrops 50 Saturn moon Iapetus 50 retreating glaciers 50 volcanic basalt 50 martian soil 50 sterile neutrino 50 matter antimatter asymmetry 50 Maastrichtian 50 Evolution Explorer 50 Cosmic Microwave Background 50 abyssal 50 olivines 50 sedimentary layers 50 stony meteorites 50 windblown sand 50 Martian meteorites 50 Martian meteorite 50 solidified lava 50 Martian crater 50 strontium isotope 50 Martian permafrost 50 Opportunity rover 50 Nasca Lines 50 Saturnian moon 50 meteorite craters 50 lunar highlands 50 liquid ethane 50 interstellar clouds 50 graphite whiskers 50 Martian rovers 50 meteorite impacts 50 SN#A 50 RS Ophiuchi 50 Saturn Enceladus 50 Snowball Earth 50 prominences 50 NASA satellites orbiting 50 polar mesospheric clouds 49 Cassini flyby 49 Hesperian epoch 49 cinder cones 49 hydrothermal fluid 49 cumulus cloud 49 crystalline silicates 49 climate modellers 49 Jovian atmosphere 49 erosional 49 Martian rocks 49 lensing galaxy 49 circumstellar disk 49 lava fountains 49 Trifid Nebula 49 volcanoes spewing 49 palaeoclimate 49 paleoclimatic 49 phyllosilicate 49 olivine crystals 49 WMAP satellite 49 Jakobshavn 49 basalt volcanic 49 stony meteorite 49 coccolithophores 49 Martian surface 49 comet tail 49 Siple Dome 49 jet contrails 49 Cerberus Fossae 49 mud volcanoes 49 Jonathan Lunine 49 Di Achille 49 wrinkle ridges 49 Aram Chaos 49 calderas 49 Comet Halley 49 icesheet 49 bedrock outcrops 49 Tharsis Rise 49 lenticular clouds 49 glacier calving 49 seabed sediments 49 filamentary structures 49 glacial melting 49 Cryogenian 49 Nectocaris 49 Martian crust 49 protostars 49 temperature reconstructions 49 igneous rocks 49 Himalayan Glaciers 49 planemos 49 galactic mergers 49 Jupiter moon Io 49 Orbiter LRO 49 asthenosphere 49 paleoclimate 49 eruptive activity 49 KBOs 49 upwellings 49 Hellas Basin 49 equatorial latitudes 49 ESA Mars 49 geomorphic 49 ejecta 49 basaltic rock 48 equatorial regions 48 olivine mineral 48 comet McNaught 48 circumstellar disks 48 Quadrantids 48 lava flows 48 southern latitudes 48 Enceladus 48 comets asteroids 48 Greenland icesheet 48 Mojzsis 48 protoplanetary disks 48 dust devils 48 martian landscape 48 Orbiter MRO 48 Norris Geyser Basin 48 Alfven waves 48 micro meteorites 48 hydrothermal fluids 48 Kuiper belt objects 48 Bullet Cluster 48 shadowy craters 48 Noctilucent clouds 48 Meteor showers 48 silicic 48 Laurentide Ice Sheet 48 Arabia Terra 48 Jupiter moons Europa 48 atmospheric aerosols 48 hydrothermal activity 48 filamentary structure 48 circumstellar 48 undersea volcanoes 48 Jovian moon 48 convective clouds 48 seafloor sediment 48 glacial melt 48 chondritic meteorites 48 Saturn moon Mimas 48 thin crescent 48 Herschel Crater 48 zodiacal light 48 planetary orbits 48 distant supernovae 48 stalagmites 48 Mars Squyres 48 volcanic tuff 48 grabens 48 Garrick Bethell 48 radar altimetry 48 distant supernovas 48 meteorite fragments 48 atmospheric methane 48 Caloris 48 Lunine 48 Noachian era 48 Sumatra Andaman earthquake 48 tectonic uplift 48 Martian terrain 48 mineral hematite 48 SN #C 48 KT boundary 48 explosive volcanism 48 Banerdt 48 Galileo spacecraft 48 Greenland glaciers 48 gravitational tides 48 Masaru Emoto 48 gullies 48 martian surface 48 Navajo Sandstone 48 volcanic lava flows 48 trilobite fossils 48 glacial moraines 48 primitive meteorites 48 earths crust 48 arctic plains 48 Laurentide ice sheet 48 neutrino particles 48 volcanic activity 48 tectonic activity 48 seafloor sediments 48 quill knobs 48 Scheila 48 lava flowing 48 Vikhlinin 48 calcite crystals 48 rubbly 48 earthshine 48 Vatnajökull 48 molten rocks 48 Earthlike planets 48 deep convective clouds 48 isobars 48 cirrus cloud 48 craters 48 ejecta plume 48 glacier shrinkage 48 planetary geologists 48 cosmic ray flux 48 Mars rover Opportunity 47 Extrasolar planets 47 Adam Riess 47 infalling 47 karst terrain 47 Fermi telescope 47 basalt lava 47 outcropping mineralized 47 meteoroid impacts 47 volcanic plume 47 olivine rich 47 interstellar dust grains 47 Cassini radar 47 AB Aurigae 47 binary asteroid 47 hoarfrost 47 tropical troposphere 47 Epsilon Aurigae 47 NASA Wilkinson Microwave 47 NEAs 47 sulfur isotopes 47 stromatolite 47 Wilkinson Microwave Anisotropy Probe 47 asteroids comets 47 volcanic magma 47 Permian extinction 47 Crab Nebula 47 chargeability highs 47 outer corona 47 volcanic lava 47 hematite mineral 47 sunlike stars 47 binary quasar 47 finely layered 47 ponded 47 glacial earthquakes 47 basaltic 47 Schladow 47 photosphere 47 planet magnetosphere 47 Comet Tempel Tuttle 47 KH #D 47 Wolszczan 47 planets orbiting distant 47 Lake Yoa 47 astronomical phenomena 47 geoglyphs 47 airglow 47 tidally 47 geological timescale 47 ion collisions 47 glacial retreat 47 Olympus Mons 47 Transantarctic Mountains 47 Mars Meridiani Planum 47 diffuse aurora 47 Planitia 47 Hesperian Epoch 47 Hubble observations 47 stellar seismology 47 aurorae 47 Earthlike 47 Viking landers 47 lavas 47 chloride concentrations 47 type Ia supernova 47 fluid inclusions 47 Terra Meridiani 47 microscopic crystals 47 dusty disks 47 colliding tectonic plates 47 pillow lavas 47 evaporite deposits 47 single celled algae 47 ostracods 47 microscopic fossils 47 galactic cores 47 NASA Mars Reconnaissance 47 active volcanism 47 nebular 47 P/# A2 47 lobate 47 disseminated pyrite mineralization 47 moon permanently shadowed 47 Viking orbiters 47 sulfate salts 47 Gas hydrates 47 cumulous clouds 47 coronal holes 47 Cenozoic era 47 geologic 47 spectroscopically 47 exosphere 47 permanently shadowed regions 47 atmospheric haze 47 Quelccaya ice cap 47 Saturn moons 47 anthropogenic warming 47 retrograde orbit 47 extraterrestial 46 cometary dust 46 auroral 46 starlike 46 Hipparcos 46 lunar maria 46 supercontinents 46 spectroscopic measurements 46 geophysically 46 anticlines 46 penitentes 46 microbialites 46 microbial mats 46 galactic disk 46 supercomputer simulations 46 ocean basins 46 thrust faulting 46 asteroseismology 46 hydrated silica 46 crustal movements 46 Eagle Nebula 46 Compact Reconnaissance Imaging Spectrometer 46 stratocumulus clouds 46 Nazca lines 46 crustal faults 46 perchlorate salts 46 oxygen isotopes 46 extrasolar 46 glacial meltwater 46 infrared satellite imagery 46 type Ia supernovae 46 melting glacier 46 Ground penetrating radar 46 Magellanic Stream 46 sulfate aerosols 46 Kuiper Belt Objects 46 unmanned probes 46 ancient supercontinent 46 Antarctic Dry Valleys 46 dinosaur extinction 46 bluish tinge 46 Viking Orbiter 46 Son Nghiem 46 Orionids 46 treelines 46 spicule 46 cosmic ray intensity 46 feathered dinosaurs 46 Mars Orbiter 46 cosmic phenomena 46 circular depressions 46 astrobiologists 46 moon Io 46 planets orbiting stars 46 NASA Voyager spacecraft 46 lava eruptions 46 Cat Paw Nebula 46 volcanic caldera 46 silicate dust 46 starscape 46 Jean Pierre Bibring 46 interstellar cloud 46 supersymmetric particles 46 accretion disks 46 superstorms 46 Orion nebula 46 V# Mon 46 Plate tectonics 46 fearsome Tyrannosaurus rex 46 distant quasars 46 coolings 46 axions 46 Gravitational waves 46 Veil Nebula 46 cirrus clouds 46 Alfred McEwen 46 hydrothermally 46 Hadley Rille 46 Rignot 46 loess 46 moonlets 46 rover Opportunity 46 ancient lakebed 46 La Nina pattern 46 Lunar Prospector 46 striations 46 conodonts 46 Cretaceous Paleogene boundary 46 galactic collisions 46 fine grained sediments 46 silicate minerals 46 flood basalts 46 paleoenvironmental 46 Eta Aquarid meteor shower 46 atmospheric phenomena 46 Alberto Saal 46 Voyager spacecraft 46 Luann Becker 46 Amundsen Sea 46 geysers erupting 46 rock outcrop 46 glaciers recede 46 ocean sediment cores 46 Arctic permafrost 46 Comet 9P/Tempel 1 46 unconsolidated sediments 46 protoplanetary discs 46 specular reflection 46 NASA Mars Odyssey 46 lunar soil 46 SDSS II 46 reddish orange hue 46 zircons 46 hydroxyl molecules 46 constellation Eridanus 46 glacial cycles 46 Melas Chasma 46 YORP effect 46 solar nebula 46 subpolar gyre 46 Caloris Basin 46 ah dus 46 Lake Vostok 46 spaceweather.com 46 astrobiological 46 Siberian Traps 46 past boninite lavas 46 GJ #b [001] 46 coronal loops 46 atmospheric CO2 levels 46 moon gravitational pull 46 methane hydrate 46 clasts 46 moon Europa 46 planetesimals 46 subtropical oceans 46 Neoproterozoic 46 icy moon Enceladus 46 dynamical processes 46 moonlet 46 aragonite 46 Corot 7b 46 X ray emission 46 blue supergiant 46 planets asteroids 46 MARSIS radar 46 hardened lava 46 continental rifting 46 Shackleton crater 46 Mars orbiting spacecraft 46 CoRoT satellite 46 Holocene epoch 46 Alpine glaciers 46 starquakes 46 carbonate globules 45 lava domes 45 Mini TES 45 Lava flows 45 chromosphere 45 polar layered 45 overhanging cliffs 45 luminous galaxies 45 sundog 45 moon Mimas 45 sulfide minerals 45 planetary nebulae 45 oxygen isotopic 45 volcanism 45 comet Tempel Tuttle 45 landsliding 45 tufa towers 45 distant galaxy clusters 45 interstellar grains 45 chemical abundances 45 undersaturated 45 Huygens probe landed 45 stromatolites 45 Cretaceous Tertiary boundary 45 pitchblende mineralization 45 globulars 45 bedrock outcropping 45 geothermal gradient 45 Red Rectangle 45 martian atmosphere 45 thermal vents 45 energetic electrons 45 Gakkel Ridge 45 radiometric dating 45 Hot Jupiters 45 Fomalhaut b 45 Microscopic particles 45 protoplanets 45 Nili Fossae 45 ESO PR 45 Carolyn Porco 45 aerosol concentrations 45 midlatitude 45 Redoubt Volcano 45 sulfidic 45 Navajo sandstone 45 Cryogenian period 45 lunar poles 45 carbonaceous meteorites 45 planetesimal 45 galaxy formation 45 stalactite 45 moulins 45 magnetic substorms 45 Kounaves 45 Global Precipitation Climatology 45 Computer simulations 45 mineralized intrusive 45 hummocks 45 sub glacial lakes 45 halite 45 Galilean satellites 45 Graphene oxide 45 Chicxulub crater 45 Geminid meteor showers 45 swirling eddies 45 VY Canis Majoris 45 alluvial sediments 45 Chladni 45 auroral activity 45 NASA Lunar Reconnaissance 45 Digitized Sky Survey 45 clumpiness 45 Toba eruption 45 carbon isotopes 45 Orionid 45 Planck telescope 45 glaciers melted 45 Martian equator 45 Oort cloud 45 glaciers 45 Phoebe orbits 45 gibbous 45 cirrus 45 giant elliptical galaxies 45 spectral fingerprints 45 cometary impacts 45 downwelling 45 planetary nebulas 45 Himalayan river basins 45 rafted debris 45 circumstellar dust 45 Tarduno 45 spicules 45 braincase 45 TRMM satellite 45 jovian 45 sandstone formations 45 NSIDC 45 supercooled droplets 45 gamma ray emission 45 layered bedrock 45 exoplanets orbiting 45 Paleocene Eocene Thermal Maximum 45 Methane hydrates 45 Hawking Radiation 45 sulfur isotope 45 mantle convection 45 mid latitudes 45 Orcus Patera 45 fumarole 45 Permian Period 45 coral skeletons 45 tidal tails 45 icecap 45 volcanic rock 45 Envisat satellite 45 Gerard Kuiper 45 Saturnian moons 45 Neogene 45 Brigham Grette 45 Methane hydrate 45 Antarctic Circumpolar Current 45 Zalasiewicz 45 Viking Lander 45 lava flowed 45 journal Astrobiology 45 mineralogical composition 45 Cumbre Vieja 45 Omega Centauri 45 protoplanetary disk 45 deformational 45 magmas 45 Delta Cephei 45 cometary 45 sedimentary rock 45 carbonate sediments 45 retreating glacier 45 ray Space Telescope 45 glaciations 45 protoplanet 45 Mars Orbiter Camera 45 tundra vegetation 45 salt crystals 45 redwood beams 45 polar latitudes 45 Diviner 45 spacecraft flyby 45 outwash 45 Supernova #A 45 forams 45 Chicxulub impact 45 Hadean 45 claystone 45 lithosphere 45 Terra Sirenum 45 oceanic circulation 45 alpine glaciers 45 isotopic ratios 45 SN #A 44 Magellanic Clouds 44 ancestor Homo erectus 44 spherically symmetric 44 Saturn outermost ring 44 sunspots 44 blobs 44 Geophysical Research 44 Geminids 44 rusticles 44 dwarf spheroidal galaxies 44 interstellar dust 44 volcano lava dome 44 hydrograph 44 lunar regolith 44 gravity warps 44 Lyman alpha 44 Titan Saturn 44 methane hydrates 44 Type 1a supernova 44 Himalaya glaciers 44 missing baryons 44 Neutron stars 44 previously unmapped 44 Larry Soderblom 44 volcanic eruptions 44 planets atmospheres 44 Cosmic Microwave Background CMB 44 shaded craters 44 Kuiper belt 44 Murchison meteorite 44 lithospheric 44 masers 44 asteroid collisions 44 molecular phylogenetic 44 crater rim 44 Hellas Planitia 44 gamma ray flares 44 ocean eddies 44 megaflood 44 polar regions 44 lunar crater 44 midlatitudes 44 Tibetan Plateau 44 plate tectonics 44 Geminid meteors 44 Bedout 44 tectonic movements 44 Martian arctic 44 coronal heating 44 rover Spirit 44 tectonically 44 polar icecap 44 oxygen isotope 44 nucleosynthesis 44 Puijila 44 Orionid meteors 44 Bethany Ehlmann 44 Haumea 44 iridescent colors 44 NASA Cassini 44 X ray telescopes 44 tholins 44 igneous rock 44 interglacial periods 44 rock outcrops 44 Seismicity 44 Saturnian moon Titan 44 carbonaceous chondrite 44 abyssal plain 44 Comet Hartley 44 antarctic ice 44 celestial phenomena 44 occultations 44 dust motes 44 Santorini eruption 44 Stromatolites 44 Earths crust 44 Solar Terrestrial Physics 44 Asteroid Itokawa 44 Velicogna 44 planets moons 44 post perovskite 44 fractal pattern 44 Robotic Arm Camera 44 SN #/#/# [002] 44 smoothest flattest 44 bonebed 44 Taurids 44 abyssal depths 44 Allende meteorite 44 backlight bleed 44 Athabasca sandstone 44 exo planets 44 trabeculae 44 fossilized footprints 44 Opportunity Mars rover 44 dinosaur skulls 44 Gaetano Di Achille 44 pterosaur fossils 44 altocumulus 44 Lyrids 44 Mayon crater 44 galaxies collide 44 malachite mineralization 44 tardigrades 44 known pika populations 44 Seyfert galaxies 44 CRISM 44 morphological similarities 44 proto planetary disks 44 Aurigid 44 galaxy redshift 44 Mercury flyby 44 Siberian permafrost 44 zinc sulfide 44 limestone bedrock 44 nanobubbles 44 smoggy atmosphere 44 ignimbrite 44 gaseous planets 44 Bill Borucki Kepler 44 continental crust 44 carbonate minerals 44 lunar meteorites 44 Sensing Satellite LCROSS 44 submillimeter galaxies 44 Molten rock 44 crustal rocks 44 HiRISE camera 44 glaciers receded 44 quartz boulders 44 martian 44 journal Geophysical Research 44 methane clathrates 44 meteoritic material 44 Martian polar 44 Bonneville Crater 44 underwater volcanoes 44 noble gases 44 magma chambers 44 Great Conveyor Belt 44 glaciers retreated 44 tufa 44 explosive eruptions 44 gray hematite 44 goethite 44 supervolcanoes 44 Guatemala sinkhole 44 Jay Zwally 44 fissure eruption 44 ULIRGs 44 presolar grains 44 energetic cosmic rays 44 plankton blooms 44 glaciers melting 44 refugia 44 planets comets 44 red supergiants 44 impactors 44 maser emission 44 stalagmite 44 Heasler 44 Cassini imaging 44 katabatic winds 44 interstellar dust clouds 44 Henize #-# 44 Higgs bosons 44 Konrad Steffen 44 Geminids meteor shower 44 crustal 44 stalactites 44 warmer wetter 44 meteor craters 44 Comet Encke 44 Red Planet 44 Patagonian Andes 44 Mössbauer 44 Palaeocene Eocene Thermal Maximum 44 Chryse Planitia 44 faint galaxies 44 Oded Aharonson 44 periodic oscillations 44 Gusev Crater 44 Guatemala Pacaya volcano 44 Linda Spilker Cassini 44 meteoroids 44 Cloudiness 44 Endurance Crater 44 WISE telescope 44 Coma Cluster 44 fumaroles 44 erupting volcanoes 44 Chicxulub 44 WASP #b 44 Earthly contamination 44 Contrails 44 dinosaur specimens 44 Microscopic examination 44 microlensing events 44 Mud volcanoes 44 distant quasar 44 Nature Geoscience 44 stalactites stalagmites 44 Antennae Galaxies 44 Qinghai Tibet plateau 44 magnetic polarity 44 extragalactic 44 streambeds 44 Substorms 44 spiral nebulae 44 Service WGMS 44 teleconnections 44 Jeffrey Plaut 43 Type 1a supernovae 43 abiogenic 43 paleoclimatology 43 convective storms 43 Mars Reconnaissance Orbiter 43 phylogeographic 43 Eemian 43 extinct volcanoes 43 Hawking radiation 43 Martian dust devils 43 Planck satellite 43 silicate crystals 43 basalt 43 basalt cliffs 43 benthos 43 COROT 7b 43 isotope composition 43 Sedimentary rocks 43 cometary debris 43 hydrological cycle 43 Geminid shower 43 Mars landers 43 Yellowstone Caldera 43 magnetic monopoles 43 sonofusion 43 Global Surveyor spacecraft 43 Omega Nebula 43 substorm 43 contaminant plume 43 topological defects 43 refractive indices 43 vuggy silica breccias 43 ocean upwelling 43 Venusian atmosphere 43 volcanic sediments 43 gravitational lens 43 Imbrium 43 komatiitic 43 gamma ray flashes 43 hummocky 43 pyroclastic 43 Cretaceous Tertiary KT 43 fossilized coral 43 cenospheres