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(Click for frequent words.) 57 Syrtis Major 57 Mount Bosavi 57 Tharsis Rise 56 Gakkel Ridge 56 Caloris Basin 56 Transantarctic Mountains 55 Ontario Lacus 55 Mariana Arc 55 supervolcanoes 55 sub glacial lakes 55 Hellas Basin 55 hydrothermal vent 54 Olympus Mons 54 Orion nebula 54 planet Gliese #g 54 Jupiter moon Io 54 lava spewing 54 KT boundary 54 abyssal plain 54 Nankai Trough Zone 54 Lake Vostok 54 COROT 7b 54 Orcus Patera 54 Fimmvorduhals 53 moon Enceladus 53 Upsilon Andromedae b 53 basaltic rocks 53 ejecta blanket 53 TrES 4 53 lunar craters 53 GJ #b [001] 53 Himalayan river basins 53 Comet Halley 53 Bonneville Crater 53 Jovian moon 53 Chasma Boreale 53 radar altimetry 53 Saturnian system 53 Pavlof 53 Pacific Gyre 53 Antarctic Dry Valleys 53 Terra Meridiani 53 Mars moon Phobos 53 Puijila 53 Tunguska explosion 52 Shiveluch 52 Tunguska meteorite 52 Cancri e 52 carbonaceous chondrite 52 Bedout 52 Shackleton crater 52 Oceanus Procellarum 52 Ring Nebula 52 microbialites 52 GJ#b 52 constellation Eridanus 52 bolide 52 GJ #b [002] 52 stromatolite 52 Giovanni Schiaparelli 52 lunar equator 52 Martian crater 52 Corot 7b 52 protoplanet 52 constellation Carina 52 Galilean satellites 52 undersea volcanoes 52 Cometary 52 Tyrrhenian Sea 52 Giovanni Cassini 52 Yellowstone caldera 52 glacially carved 52 Gamma ray burst 52 HD#b 52 Horsehead Nebula 52 martian meteorites 52 Titan smoggy 52 lunar crust 52 sedimentary deposits 51 icy comets 51 Ares Vallis 51 flood basalts 51 Omega Centauri 51 extrasolar planet 51 volcanic crater 51 gaseous planet 51 Cosmic Microwave Background 51 Sojourner rover 51 layered bedrock 51 comets asteroids 51 Dumbbell Nebula 51 mud volcanoes 51 comet Churyumov Gerasimenko 51 Yellowstone Caldera 51 Lake Untersee 51 volcano Olympus Mons 51 Dry Valleys 51 Pluto Charon 51 Endurance crater 51 McMurdo Dry Valleys 51 Apophis asteroid 51 Lassen Peak 51 astronomer Percival Lowell 51 Denisova cave 51 lava tubes 51 mammal fossils 51 Michael Studinger 51 tectonic faults 51 Venusian atmosphere 51 Palaeozoic sedimentary 51 retrograde orbit 51 comets meteors 51 martian rocks 51 Stromboli volcano 51 Chicxulub crater 51 Tunguska Siberia 51 Fomalhaut b 51 BLG #Lb 51 Gamburtsev 50 comet McNaught 50 Quaoar 50 Planitia 50 sea hydrothermal vents 50 glacier carved 50 planet HD #b 50 Grímsvötn volcano 50 icy moons 50 smallest exoplanet 50 Stromatolites 50 lobate scarps 50 HiRISE image 50 solidified lava 50 Aristarchus 50 Chicxulub 50 conodonts 50 meteorite fragments 50 Chicxulub asteroid 50 extrasolar 50 THEMIS Image 50 Gliese #G 50 San Sebastiano cemetery 50 impactor spacecraft 50 Puu Oo 50 melting glacial 50 Optical Gravitational Lensing Experiment 50 carbonaceous chondrites 50 Martian rovers 50 Earthlike planet 50 Quadrantids 50 superheavy elements 50 Trifid 50 meteoroid 50 Asteroid Belt 50 asteroid Eros 50 seafloor sediments 50 cluster NGC 50 Tunguska Event 50 stony meteorites 50 Terra Sirenum 50 Brigham Grette 50 glacial moraines 50 Oort cloud 50 Snowball Earth 50 galaxy M# [001] 50 rover Sojourner 50 massifs 50 geochronology 50 Bramley Murton 50 PSR J# 50 Cordillera Blanca 50 planetary surfaces 50 moon Mimas 50 Coma Cluster 50 icefield 50 airglow 50 Nazca lines 50 Krafla 50 Comet Hartley 2 50 subglacial 50 Shackleton Crater 50 Goldilocks planet 50 Iguanodon 50 sea hydrothermal vent 50 Kuiper belt objects 50 Arsia Mons 50 Toutatis 50 cometary dust 50 Brunt Ice Shelf 50 called lobate scarps 50 Melas Chasma 50 Baptistina 49 Gerasimos Papadopoulos 49 jovian 49 comet Boethin 49 Boar Tusk 49 Titan flyby 49 ringed planet 49 Saturn rings 49 meteorite crater 49 Reiner Gamma 49 Super Earths 49 Sicily Mount Etna 49 Martian rocks 49 Saturn Enceladus 49 celestial sphere 49 eruptive activity 49 subsurface ocean 49 Helix Nebula 49 Neanderthal teeth 49 shadowy craters 49 Mount Unzen 49 Mendenhall Glacier 49 Cerro Paranal 49 Mini SAR 49 rock outcrop 49 bonebed 49 Nankai Trough 49 igneous rocks 49 cinder cones 49 Spitzbergen 49 sundog 49 Jupiter moons 49 PSR B# +# 49 Gliese #c 49 MARSIS radar 49 sheet Summerhayes 49 Okmok Caldera 49 moons Phobos 49 Herschel Crater 49 constellation Auriga 49 Neutron stars 49 dimming starlight 49 Saturn outermost ring 49 submarine volcanoes 49 Halemaumau 49 moonquakes 49 Icadyptes 49 mesosphere 49 nicknamed Bonneville 49 planet Gliese #c 49 rocky extrasolar planet 49 Aqua satellite 49 Gerard Kuiper 49 esker 49 Iceberg Alley 49 transiting exoplanet 49 Disko Bay 49 Kuiper Belt Objects 49 Descent Imager Spectral Radiometer 49 Hadley Rille 49 Antartic 49 meteoritic material 49 Perseus Cluster 49 Arabia Terra 49 paleochannel 49 dino bones 49 Lamont Doherty 49 CoRoT 7b 49 Kanaga Volcano 49 ancient petroglyphs 49 crater 49 Saturn moon Mimas 49 Grillmair 49 inner asteroid belt 49 polygon shaped 49 seabed sediments 49 Kraken Mare 49 asteroidal 49 Staudigel 49 bathyscaphe 49 Gusev crater 49 Toba eruption 49 magma chamber 49 Gakkel 49 astronomer Tycho Brahe 49 lenticular clouds 49 SN #C 49 constellation Hercules 49 Sarychev Peak 49 Viking Lander 49 mantle plumes 49 twin Voyager spacecraft 49 calderas 49 nebula NGC 49 extragalactic 49 Dominique Cassini 49 intraplate 49 Virgo Cluster 49 icecap 49 antarctic 49 Hellas Planitia 49 sunlike star 49 ocean basins 48 vapor plume 48 Kasatochi 48 planets orbiting sun 48 terminal moraine 48 Vesuvius eruption 48 Nasa spacecraft 48 isostatic rebound 48 cosmic microwave radiation 48 large oceanic plateaus 48 #gy 48 metamorphic rock 48 comets orbiting 48 Endeavour Crater 48 earliest hominid 48 Chicxulub Crater 48 hypocenter 48 polar plateau 48 asteroids orbiting 48 Greenland icecap 48 Foton M3 48 Galileo spacecraft 48 Earth asteroids NEAs 48 polar icecap 48 Western Cwm 48 basalt cliffs 48 sunlike stars 48 Mount Etna 48 Martian meteorites 48 Earth radii 48 El Teide 48 NASA CloudSat 48 Murchison meteorite 48 planets asteroids 48 Svalbard archipelago 48 Crozet Islands 48 MUSES C 48 Caloris 48 Corot 9b 48 Alfred Wegener 48 orbited Jupiter 48 NEAs 48 Regolith 48 Lagoon Nebula 48 Earths crust 48 coral encrusted 48 Fossae 48 #ft #m [001] 48 Hekla 48 inhabitable planets 48 exo planets 48 Mercury magnetosphere 48 Argentinosaurus 48 bedrock outcropping 48 Newberry Volcano 48 Nares Strait 48 Elysium Planitia 48 Martian craters 48 Antikythera mechanism 48 # Apophis 48 APXS 48 Mars Gusev Crater 48 P/# A2 48 radio occultation 48 Surtsey 48 basalt lava 48 Weddell Sea 48 Taurus Littrow 48 Dig unearths 48 Kilauea caldera 48 Chankillo 48 V# Sgr 48 ocean sunfish 48 noctilucent clouds 48 Oort Cloud 48 receding glacier 48 Kuiper Belt object 48 methyl cyanide 48 Kilauea Iki 48 stratovolcano 48 Jakobshavn Isbrae 48 pallasite 48 iridium layer 48 Milensky 48 Noctilucent clouds 48 Middle Awash 48 granite spiers 48 Nili Fossae 48 limestone cavern 48 Greenland glacier 48 Deep Impact eXtended Investigation 48 constellation Coma Berenices 48 neutrino telescope 48 astronomer Ptolemy 48 Solar TErrestrial RElations Observatory 48 Jupiter moons Europa 48 lander rover 48 limestone outcroppings 48 infalling gas 48 hydrated minerals 48 Venusian surface 48 paleomagnetic 48 comet nucleus 48 fjord 48 lunar perigee 48 Ventotene 48 basalt rock 48 geomorphology 48 astronomer Johannes Kepler 48 gastropod 48 refrozen ice 48 periodic dimming 48 Eratosthenes 48 Autosub 48 Cape Alava 48 Son Doong 48 Kuiper Belt Object 48 snailfish 48 thunderstorms loomed 48 Denali Fault 48 Jovian moons 48 NASA LCROSS 48 circular particle accelerator 48 Grímsvötn 48 Umnak Island 48 RS Ophiuchi 48 Super Kamiokande 48 Isidis Planitia 48 Bellingshausen Sea 48 exoplanets orbiting 48 lunar crater 48 noctilucent cloud 48 constellation Andromeda 48 planetary nebulas 48 ostracods 48 Jerzy Kukuczka 48 Woodhenge 48 Mount Karthala 48 Guatemala sinkhole 48 Antarctic Ice Shelf 48 crustal thickness 48 Valles Marineris canyon 48 WASP #b 48 Stephan Quintet 48 Roman villa 48 steam eruptions 48 Vastitas Borealis 48 Uummannaq 48 oceanic crust 48 GRB #B 48 cinder cone 47 subglacial lakes 47 Meteor Crater 47 constellation Aquarius 47 exoplanetary 47 active volcanism 47 extinct volcanoes 47 Kuiper belt 47 Omega Nebula 47 Institute MBARI 47 Antarctic icecap 47 fossilized shells 47 constellation Cassiopeia 47 ejecta 47 Tunguska 47 zodiacal light 47 Cascadia fault 47 geoneutrinos 47 Cape Foulweather 47 chromosphere 47 phytoplankton bloom 47 submersible Alvin 47 equatorial plains 47 trilobite 47 Burgess Shale 47 tektites 47 Cabrol 47 Follett Pillars 47 fossilized creatures 47 volcano Vesuvius 47 Jurassic sandstone 47 sized planets orbiting 47 hydroxyl molecules 47 trans Neptunian 47 Manarola 47 G#.# +#.# 47 Samuel Oschin Telescope 47 Beardmore Glacier 47 Earthlike planets 47 Jakobshavn 47 magma boiling 47 Saturn Cassini 47 Mawrth Vallis 47 spherules 47 hydrosphere 47 elliptical galaxy 47 volcanic basalt 47 cryovolcanism 47 Jakobshavn Glacier 47 triggering tidal waves 47 Antarctica EPICA 47 Delta Cephei 47 galaxy M# [002] 47 grabens 47 Wolszczan 47 Comet Encke 47 Zacaton 47 polar vortex 47 megathrust 47 Kay Bidle 47 Suruga Bay 47 KBOs 47 permanently shadowed crater 47 Piton de la 47 Ringed Planet 47 Kirishima range 47 Chilean Atacama Desert 47 moons orbiting Saturn 47 supervolcano 47 moonlets 47 Meridiani 47 Altai Mountains 47 Sierra Negra 47 Etna eruption 47 deepwater corals 47 unmanned probes 47 SN #D 47 Mars# experiment 47 Alpine glaciers 47 magnetic monopole 47 permanently shadowed craters 47 aspen grove 47 Deccan Traps 47 North Pacific Gyre 47 dust enshrouded 47 volcanogenic 47 barred spiral galaxy 47 Eridanus 47 whaleback 47 Saturn moon Enceladus 47 volcanic caldera 47 AGNs 47 Von Frese 47 Epsilon Eridani 47 Supernova #A 47 Chazy Reef 47 volcanic lava flows 47 moon Europa 47 coldest driest 47 Rosetta lander 47 perigee moon 47 AB Aurigae 47 gravitational keyhole 47 star Spica 47 horseshoe shaped crater 47 volcanically active 47 BP Piscium 47 cometary material 47 Pleiades cluster 47 sengi 47 Saturnian moon Titan 47 Martian volcanoes 47 Earth asteroid Itokawa 47 LRO spacecraft 47 coccolithophores 47 subglacial lake 47 Nyiragongo 47 Kepler #b 47 finely layered 47 Dromomeron 47 cosmic collisions 47 Asilisaurus 47 Tracy Arm fjord 47 constellation Lyra 47 marine sediments 47 axial tilt 47 exo planet 47 rock outcropping 47 Pan STARRS PS1 telescope 47 extrasolar planetary systems 47 Lituya Bay 47 Sesia Valley 47 Exit Glacier 47 lunar meteorites 47 Morro Rock 47 evaporite 47 QQ# 47 katabatic winds 47 geodynamic 47 semidesert 47 volcanic craters 47 ESA GOCE 47 southern supercontinent 47 whiz harmlessly 47 supernova remnant 47 Vatnajokull 47 RQ# 47 Museo Nazionale 47 Red Rectangle 47 spaceweather.com 47 Heasler 47 Chukotka Peninsula 47 Earthly contamination 47 CoRoT 9b 47 Pluto Eris 47 microbial mats 47 Polar explorers 47 driftless area 47 Permian extinction 47 tidewater glaciers 47 rune stone 47 nebular 47 star Beta Pictoris 47 Copter crashes 47 Extrasolar Planet Search 47 chondritic meteorites 47 Andaman Islands quake 47 sulfidic 47 planetary transits 47 mastodon tusk 47 volcano Krakatau 47 Comet Tempel 1 47 Opportunity rover 47 sulfate minerals 47 distant supernovas 47 Leif Eriksson 47 thermal vents 47 glacier 47 Perito Moreno glacier 47 Siberian Traps 47 Lo'ihi 47 permanently shadowed lunar 47 Mini Thermal Emission 47 solidified lava flows 47 Harding Icefield 47 planetary Transits 47 MG J# +# 47 sulfur isotope 47 famed naturalist 47 Martian equator 47 driftless 47 subducting plate 47 Denisova Cave 47 Nikku Madhusudhan 47 Sucia Island 47 gamma ray observatory 47 hyena dung 47 interplanetary dust 47 planet Uranus 46 VY Canis Majoris 46 basalt volcanic 46 microscopic fossils 46 pulsating aurora 46 electron orbits 46 magnetar 46 Microraptor gui 46 fissure eruption 46 Sunset Crater 46 ecliptic plane 46 interstellar dust particles 46 cumulus cloud 46 Norway Svalbard 46 Surface Composition Spectrometer 46 Ruwenzori Mountains 46 ice calved 46 Ice Age mammals 46 basaltic rock 46 Churyumov Gerasimenko 46 exosolar planets 46 Cosmic ray 46 chemosynthetic 46 Cabeus 46 meteoroids 46 Planetary Transits 46 karst topography 46 Franz Josef Land 46 hypernova 46 comet nuclei 46 HiRISE images 46 Upsilon Andromedae 46 Maunder minimum 46 Turiasaurus 46 binary asteroid 46 tadpole shaped 46 sediments deposited 46 Comet #P/Churyumov-Gerasimenko 46 Valles Marineris 46 glacial boulder 46 super perigee moon 46 volcanic magma 46 braneworld 46 Peony nebula star 46 Exoplanet 46 Vatnajökull 46 planetary nebula 46 erupting lava 46 HIP #b 46 previously unmapped 46 Halema'uma'u Crater 46 Jonathan Lunine 46 Candor Chasma 46 transiting exoplanets 46 Bug Nebula 46 Lunokhod 46 Encke gap 46 glacial moraine 46 planetesimal 46 ah dus 46 glacial boulders 46 Storrie Lombardi 46 double helix nebula 46 smallest extrasolar planet 46 Neogene 46 asteroid flyby 46 moons orbiting 46 Ionosphere Sounding 46 Saturn moons 46 Earth objects NEOs 46 exoplanetary systems 46 wrinkle ridges 46 Halema'uma'u 46 Ice Ages 46 HD #b [002] 46 asteroid 46 interstellar cloud 46 Sagalassos 46 Jupiter icy moons 46 outer planets 46 geomicrobiology 46 carbonate minerals 46 faint smudge 46 Strathcona Fiord 46 galactic bulge 46 Veil Nebula 46 Victoria Crater 46 hole WAT# 46 Drygalski ice tongue 46 Hermit Rest 46 crustal plate 46 Darnley Bay gravity 46 Saturnian 46 Sakurajima 46 Whillans Ice Stream 46 lunar maria 46 Observatoire de Paris 46 Claudius Ptolemy 46 Pea galaxies 46 Martian terrain 46 Cabeus crater 46 ancient lakebed 46 Crab Pulsar 46 Extrasolar 46 Laurentide ice sheet 46 Trifid Nebula 46 biogeographic 46 Josefino Comiso 46 warship Vasa 46 Saturnian moons 46 Ulysses spacecraft 46 landforms 46 Mars Phobos 46 continuously erupting volcano 46 Shepherding Spacecraft 46 constellation Serpens 46 volcanic archipelago 46 Cygnus X 46 sterile neutrino 46 abyssal plains 46 Gliese #e 46 moon Io 46 astrobiological 46 volcano spews 46 phyllosilicates 46 tectonic plate dives 46 stromatolites 46 LUMCON research 46 Doppler measurements 46 volcanic ridges 46 inch refractor telescope 46 timberline 46 Petit Piton 46 comet Tempel Tuttle 46 ship Akademik Fyodorov 46 Comet Hartley 46 subseafloor 46 strange quark 46 lunar soil 46 IODP Expedition 46 Pedro Martinez Arbizu 46 spiral galaxy NGC 46 red supergiant 46 Chile Chaiten volcano 46 brightest supernova 46 meteor crater 46 supergiant stars 46 lava flowed 46 absorbs photons 46 methane seeps 46 Stardust spacecraft swooped 46 Chicxulub impact 46 Hot Jupiters 46 type Ia supernova 46 USArray 46 distant supernovae 46 SuperMoon 46 Cenozoic Era 46 BRACELET MEASUREMENTS Opening 46 hematite mineral 46 Eagle Nebula 46 hominid skull 46 Amery Ice Shelf 46 occultations 46 Platzerwasel 46 Mount Mazama 46 giant squid Architeuthis 46 ionized particles 46 Ionospheric Sounding 46 planets comets 46 phyllosilicate 46 downwelling 46 amphipods 46 Magellanic Stream 46 Methone 46 Permo Triassic 46 stellar occultations 46 volcanic lava 46 oceanic plates 46 Khumbu Glacier 46 Convection Rotation 46 zodiac constellations 46 constellation Centaurus 46 angular boulders 46 substorm 46 Antarctic continent 46 galaxy NGC 46 Pu'u O'o crater 46 Novaya Zemlya 46 past boninite lavas 46 Ogasawara Islands 46 tidewater glacier 46 crystalline silicates 46 Dust devils 46 geodynamics 46 Cretaceous Tertiary KT 46 caravel 46 Umberto Nobile 46 Longyearbyen Norway 46 tetrahedron 46 mineral olivine 46 Jean Pierre Bibring 46 Haughton Crater 46 Impact Crater 46 melt inclusions 46 Elephant Seals 46 magnetic monopoles 46 Arik Posner 46 rubbly 46 layered sedimentary rock 46 Henize #-# 46 Zeta Ophiuchi 46 Cenote 46 Ius Chasma 46 Soputan 46 CDMS experiment 46 neutrino detectors 46 Vredefort 46 comet Lulin 46 Magnetars 46 equatorial belt 46 extrasolar planets orbiting 46 NASA rovers Spirit 46 Cassini flyby 46 Extrasolar Planets 46 Milankovitch 46 volcanic cone 46 paleontological dig 46 meteorite impacts 46 Martian dunes 46 microlensing 46 Ostia Antica 46 methanogens 46 Hipparchus 46 penetrating radar 46 Adélie penguins 46 melting glacier 46 hydrothermal activity 46 Mossbauer spectrometer 46 constellation Scorpius 46 Microlensing 45 speleologists 45 Saturn outermost 45 Ny Ålesund 45 tumulus 45 Akademik Ioffe 45 Substorms 45 circumstellar 45 TrES 45 asteroid Vesta 45 Brimstone Pit 45 olivine mineral 45 undersea volcano 45 Westman Islands 45 tectonic stresses 45 cosmic cannibal 45 La Parguera 45 Wolf Rayet stars 45 spinning neutron 45 magnetospheric 45 Rongbuk glacier 45 Sagittarius dwarf galaxy 45 Colima volcano 45 landform 45 Saturnian moon 45 Hubble orbits 45 Geminga 45 Dan Dzurisin 45 asteroid impacts 45 Pierre Simon Laplace 45 gabbro intrusive 45 polygon patterns 45 coelacanths 45 moonlike 45 Antartica 45 planetary geology 45 pumice plain 45 Olduvai 45 novas 45 freshwater jellyfish 45 tectonic activity 45 cenospheres 45 Mount Vesuvius buried 45 Viking orbiters 45 circumstellar disks 45 CoRoT satellite 45 continental crust 45 blue supergiant 45 particle smasher 45 Namib Desert 45 Quadrantid meteor shower 45 MEarth 45 Palaeocene Eocene Thermal Maximum 45 Martian polar 45 Fermi telescope 45 duration spaceflights 45 Yellowstone supervolcano 45 filamentary structure 45 Puerto Rico Trench 45 Planck telescope 45 ionized hydrogen 45 Sunda Trench 45 Hesperian Epoch 45 afterglows 45 geochemists 45 noon Mendenhall Glacier 45 constellation Cetus 45 astrobiologists 45 Climate Experiment GRACE 45 coronal loop 45 warm interglacial periods 45 coronal loops 45 Neanderthal fossils 45 glaciations 45 iceberg calving 45 auroral displays 45 Curiosity rover 45 Norwegian explorer Fridtjof 45 Sermilik Fjord 45 cosmological distances 45 depressions pockmark 45 Mount Erebus 45 crustal 45 Nares Strait separating 45 drilling vessel Chikyu 45 NASA Lunar Prospector 45 COROT exo 3b 45 Aletsch 45 Eta Aquarids 45 Saturn magnetosphere 45 crater rim 45 Kermadec Arc 45 King Herod tomb 45 Ny Alesund 45 polar 45 RRATs 45 Pu'u O'o 45 mu Arae 45 Deep Impact flyby spacecraft 45 Space Environment Geochemistry 45 volcano Mount Vesuvius 45 constellation Vulpecula 45 renowned astrophysics observatory 45 Mojzsis 45 Manned missions 45 Noachian era 45 Arches Cluster 45 Cassini Image 45 Chajnantor plateau 45 CCGS Amundsen 45 western Antarctic Peninsula 45 basalts 45 Nectocaris 45 Limmat River 45 muon neutrinos 45 Cloud Aerosol Lidar 45 Solar Flares 45 evaporite deposits 45 bristlecone pines