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(Click for frequent words.) 73 permanently shadowed craters 67 shadowy craters 65 Shackleton crater 64 Cabeus crater 64 shadowed craters 64 polar craters 64 lunar craters 62 permanently shadowed regions 61 lunar poles 60 permanently shadowed crater 60 Martian polar 59 lunar equator 59 subsurface ocean 59 comets asteroids 58 icy moons 58 Earthlike planet 58 Martian equator 58 sunlike stars 58 Meridiani 57 Cabeus 57 Oort Cloud 57 Fomalhaut b 57 mesosphere 57 Shackleton Crater 57 comet nucleus 57 Fermi telescope 57 mineralogical composition 57 solar corona 57 penetrating radar 57 shaded craters 57 moon permanently shadowed 57 volcanically active 56 Saturn moon Enceladus 56 Earthlike 56 Terra Meridiani 56 Venusian atmosphere 56 Oort cloud 56 ionized hydrogen 56 Kuiper belt 56 Perseus Cluster 56 heavily cratered 56 Upsilon Andromedae b 56 habitable zones 56 Aram Chaos 56 rocky planets 56 earthlike planets 56 dust enshrouded 56 active volcanism 55 Neutron Detector 55 KBOs 55 Syrtis Major 55 planets orbiting stars 55 magnetosphere 55 cometary material 55 Enceladus 55 Candor Chasma 55 Earthlike planets 55 Mars Squyres 55 VY Canis Majoris 55 equatorial regions 55 moonlets 55 Upsilon Andromedae 54 gaseous planets 54 fainter objects 54 radioactive nuclei 54 comets orbiting 54 planet Gliese #g 54 hydrated minerals 54 AGNs 54 Coma Cluster 54 phyllosilicates 54 jovian 54 Antarctic Dry Valleys 54 lunar crater 54 moon Europa 54 interstellar boundary 54 Mars Meridiani Planum 54 Cassini flyby 54 Planitia 54 protoplanetary disks 54 mantle plumes 54 circumstellar disks 54 luminous galaxies 54 outer corona 54 polar regions 54 highly elliptical orbits 54 Meridiani Planum 54 smallest exoplanet 54 Kuiper Belt Objects 54 moonquakes 54 polar layered 54 globulars 54 circumstellar disk 54 exosphere 54 planet HD #b 54 sub glacial lakes 54 Gusev crater 54 smoggy atmosphere 54 Vastitas Borealis 53 Geminga 53 icy moon Enceladus 53 gamma ray emitting 53 distant galaxies 53 circumstellar 53 Diviner instrument 53 Cosmic Microwave Background 53 moon Mimas 53 Saturnian moons 53 meteoroids 53 Manned missions 53 Virgo Cluster 53 periodic dimming 53 energetic electrons 53 martian atmosphere 53 extrasolar 53 icy comets 53 Saturn moon 53 craters 53 lunar crust 53 planetary nebulae 53 constellation Eridanus 53 planetary surfaces 53 habitable planets 53 Omega Centauri 53 Jupiter icy moons 53 seafloor sediments 53 NEAs 53 constellation Carina 53 prebiotic molecules 53 polar caps 53 geologically active 53 permanently shadowed lunar 52 Andromeda galaxy 52 Neutron stars 52 photosphere 52 smoothest flattest 52 magnetars 52 Elliptical galaxies 52 icy crust 52 spectral fingerprint 52 lunar meteorites 52 stony meteorites 52 electron diffusion 52 Valles Marineris 52 Terra Sirenum 52 planetesimals 52 lunar soil 52 moonlet 52 planets orbiting distant 52 lunar surface 52 EPOXI spacecraft 52 hydroxyl molecules 52 phyllosilicate 52 Corot 9b 52 comets 52 Goldilocks zone 52 planetary embryos 52 APXS 52 ah dus 52 Endurance crater 52 distant quasars 52 Martian surface 52 Saturn Cassini 52 Arabia Terra 52 electron neutrinos 52 Nili Fossae 52 brown dwarfs 52 TNOs 52 planemos 52 hematite mineral 52 sedimentary deposits 52 exoplanets planets 52 Isidis Planitia 52 Milky Way halo 52 exoplanets orbiting 52 cometary 52 inner Oort Cloud 52 moon Titan 52 interstellar cloud 52 Samuel Oschin Telescope 52 unaided eye 51 exo planets 51 moon Io 51 Mandushev 51 Cosmic rays 51 Jupiter moons Europa 51 subglacial lake 51 cryovolcanism 51 Bug Nebula 51 frigid polar 51 planets orbits 51 Lagoon Nebula 51 potentially habitable 51 Hellas Basin 51 Quaoar 51 COROT 7b 51 Asteroid Belt 51 ejecta plume 51 Kuiper Belt 51 Martian arctic 51 Lake Untersee 51 ionized gas 51 Bok globules 51 olivine mineral 51 meteor impacts 51 Martian crust 51 extrasolar planetary systems 51 Orientale Basin 51 Ontario Lacus 51 ejecta blanket 51 moons orbiting 51 ejecta 51 Earths orbiting 51 galaxy clusters 51 airglow 51 Martian dust 51 Oceanus Procellarum 51 terrestrial planets 51 lunar regolith 51 basaltic rocks 51 Gusev Crater 51 Saturn magnetosphere 51 interstellar dust grains 51 sulfate minerals 51 asteroids comets 51 Mini SAR 51 protoplanet 51 chromosphere 51 Gliese #c 51 Phoebe orbits 51 Martian crater 51 Galileo spacecraft 51 protoplanetary disk 51 midlatitudes 51 WISE spacecraft 51 #P/Churyumov-Gerasimenko 51 gamma rays emitted 51 gravitationally bound 51 clathrates 51 AU Mic 51 nebulae 51 comet 51 mid latitudes 51 globular clusters 51 gaseous planet 51 distant supernovas 51 lunar orbiters 51 sterile neutrino 51 cometary impacts 51 Polar Regions 51 constellation Centaurus 51 Saturn Enceladus 50 Mount Bosavi 50 spiral galaxy NGC 50 Martian craters 50 distant galaxy 50 Orbiter LRO 50 constellation Virgo 50 comet dust 50 CoRoT satellite 50 Saturnian moon Titan 50 cosmological distances 50 called gray hematite 50 protons collide 50 NASA QuikScat satellite 50 NASA rovers Spirit 50 distant suns 50 cometary dust 50 Magnetars 50 interplanetary dust 50 Jean Pierre Bibring 50 interstellar particles 50 moon Enceladus 50 Martian rocks 50 brown dwarf 50 arctic plains 50 GJ #b [001] 50 martian 50 lunar craters near 50 comet Wild 50 galactic cosmic rays 50 magma ocean 50 martian rocks 50 Mawrth Vallis 50 asteroids 50 galaxy M# [002] 50 Orionid 50 CoRoT 9b 50 mineral olivine 50 Sojourner rover 50 thin crescent 50 asteroidal 50 energetic cosmic rays 50 moons Phobos 50 Kuiper belt objects 50 Milky Way Galaxy 50 cosmic rays 50 X ray spectrometer 50 Earth magnetosphere 50 Martian volcanoes 50 Veil Nebula 50 retrograde orbit 50 heliosheath 50 dirty snowballs 50 giant gaseous planets 50 elongated orbits 50 Hot Jupiters 50 silicon monoxide 50 Caloris 50 galactic clusters 50 polar oceans 50 asteroid Eros 50 MG J# +# 50 Orion Nebula 50 interstellar dust 50 Chicxulub Crater 50 infrared wavelengths 50 Bonneville Crater 50 Epsilon Eridani 50 Explorer WISE 50 solar nebula 50 silicate dust 50 interstellar clouds 50 asteroids orbiting 50 seabed sediments 50 Cometary 50 Hubble Ultra 50 planet Gliese #c 50 Kuiper belt object 50 Mars Gusev Crater 50 HiRISE image 50 astronomical objects 50 gamma ray observatory 50 TrES 4 50 spherules 50 Solar flares 50 Jovian moons 50 habitable planet 50 microbialites 50 southerly latitudes 50 stellar nurseries 50 Cat Paw Nebula 50 galactic magnetic 50 synchronous orbit 50 Lake Vostok 50 Extrasolar planets 50 comet nuclei 50 telescopic observations 50 dangerous galactic cosmic 50 permafrost melts 50 planets asteroids 50 neutron spectrometer 49 globular star 49 Comet Churyumov Gerasimenko 49 abyssal plain 49 Ground penetrating radar 49 hydrosphere 49 constellation Ursa Major 49 planetary nebulas 49 auroral emissions 49 GJ #b [002] 49 HD #b [002] 49 regolith 49 coronal loops 49 Jovian moon 49 single celled algae 49 Nasa Mars Reconnaissance 49 exosolar planets 49 Alfven waves 49 X ray observatories 49 bedrock outcropping 49 planets 49 X ray emission 49 dynamical processes 49 heliosphere 49 martian soil 49 Mini TES 49 Composite Infrared Spectrometer 49 infrared telescopes 49 mineral hematite 49 Venusian surface 49 Earth ionosphere 49 Saturnian moon 49 blackholes 49 weakly interacting 49 GJ#b 49 sized planets orbiting 49 galactic bulge 49 blocks harmful ultraviolet 49 supersymmetric particles 49 HD#b 49 globular cluster 49 Olympus Mons 49 polar vortex 49 IBEX spacecraft 49 laser altimeter 49 constellation Hercules 49 Comet Tempel Tuttle 49 magnetic monopoles 49 unmanned probes 49 Gravitational waves 49 Pluto Charon 49 gravitational tides 49 Orbiter MRO 49 meteoroid 49 planets moons 49 Solar System 49 cosmic ray particles 49 jarosite 49 Hellas Planitia 49 protostars 49 merging galaxies 49 comet Churyumov Gerasimenko 49 Huygens probe landed 49 Comet 9P/Tempel 1 49 Borealis basin 49 IRC +# 49 BLG #Lb 49 astrobiological 49 coronal mass ejections CMEs 49 permafrost 49 Orcus Patera 49 Goldilocks planet 49 rubbly 49 Corot 7b 49 northern arctic plains 49 Lunar Prospector 49 Saturn moons 49 neighboring Andromeda galaxy 49 celestial object 49 tholins 49 galactic disk 49 relativistic particles 49 inhabitable planets 49 dense clumps 49 CMB radiation 49 ammonia hydrates 49 hydrostatic equilibrium 49 extrasolar planets 49 deep convective clouds 49 biosignatures 49 Comet Machholz 49 cryosphere 49 filamentary structures 49 star Fomalhaut 49 gamma ray burst 49 Antennae Galaxies 49 visible wavelengths 49 Ring Nebula 49 Galilean satellites 49 carbonate minerals 49 planets constellations 49 Andromeda Galaxy 49 antineutrinos 49 mud volcanoes 49 polar icecap 49 Fornax cluster 49 McMurdo Dry Valleys 49 Kuiper Belt Object 49 constellation Aquarius 49 X ray wavelengths 49 molten magma 49 magnetospheric 48 planets circling stars 48 LCROSS spacecraft 48 Endeavour Crater 48 habitable zone 48 Coma cluster 48 Distant galaxies 48 distant supernovae 48 Higgs bosons 48 diffuse aurora 48 submillimeter wavelength 48 galaxies 48 BP Psc 48 Comet Lulin 48 water vapor 48 Galilean moons 48 Martian microbes 48 Milky Way galaxy 48 transiting planets 48 infall 48 Fashion Movie Reviews 48 explosive volcanism 48 AB Aurigae 48 Beta Pictoris 48 dimming starlight 48 Gliese #G 48 Explosive eruptions 48 comet particles 48 presolar grains 48 proplyds 48 Bonnie Buratti 48 windblown sand 48 Neptune Uranus 48 magnetic reconnection 48 lunar highlands 48 Beta Pictoris b 48 aurorae 48 Mimas 48 interstellar medium 48 Earth orbiting satellites 48 Evolution Explorer 48 permafrost thaws 48 Herschel telescope 48 polar mesospheric clouds 48 ultraviolet wavelengths 48 smoothest flattest spot 48 lensing galaxy 48 large oceanic plateaus 48 Nasa spacecraft 48 tau neutrinos 48 filamentary structure 48 Arsia Mons 48 sun corona 48 Carina Nebula 48 hydrated silica 48 MARSIS radar 48 OMEGA instrument 48 sulfate salts 48 Jupiter Ganymede 48 cometary debris 48 seafloor sediment 48 Enceladus icy 48 protoplanetary 48 planet HD#b 48 Meridiani plains 48 RQ# 48 vapor plume 48 deepwater corals 48 Victoria Crater 48 Uninhabited Aerial Vehicle 48 saline aquifers 48 Dumbbell Nebula 48 Martian soil 48 hydrothermal vent 48 Saturn moon Mimas 48 impactors 48 northern latitudes 48 magnetar 48 Serpens Cauda 48 refrozen ice 48 Bruce Banerdt 48 Elysium Planitia 48 continental crust 48 Gamma rays 48 cosmic neutrinos 48 interstellar dust particles 48 habitable worlds 48 Tempel Tuttle 48 star Beta Pictoris 48 emits X rays 48 Hesperian Epoch 48 Saturnian system 48 planets astronomers 48 dwelling organisms 48 Io Europa 48 NASA Cassini 48 Eagle Nebula 48 Elenin 48 P/# A2 48 photosynthetic microbes 48 aphelion 48 Kepler #b 48 millimeter wavelengths 48 Martian dunes 48 inner asteroid belt 48 COROT 48 quasars 48 Svedhem 48 Higgs particle 48 galactic halo 48 quasar 48 Microlensing 48 missing baryons 48 neutrinos 48 SIRTF 48 silicic 48 Mars Pathfinder lander 48 trans Neptunian 48 crater 48 ecliptic plane 48 astrophysical objects 48 olivines 48 Exoplanet 48 Saturn outermost 48 spacecraft flyby 48 Gliese #d 48 Ulysses spacecraft 48 infrared spectrometers 48 Saturn rings 48 relativistic jets 48 constellation Libra 48 HL Tau 48 primitive meteorites 48 innermost planet 48 exoplanetary 48 fissure eruption 48 extrasolar planet 48 Larry Soderblom 47 vulnerable thermal shielding 47 supernova explosions 47 tropopause 47 Comet Encke 47 Mars Odyssey Orbiter 47 Siple Dome 47 subglacial 47 abyssal 47 Heliospheric Observatory SOHO 47 Aqua satellites 47 semidesert 47 constellation Andromeda 47 terraformed 47 carbonaceous chondrite 47 gray hematite 47 undersea volcanoes 47 seafloors 47 WASP #b 47 polar 47 Taurus Littrow 47 emit gamma rays 47 Rydberg atoms 47 orbiter Mars Odyssey 47 WISE telescope 47 dwarf galaxies 47 Spitzer Space Telescope 47 micrometeoroids 47 trans Neptunian objects 47 meteoroid impacts 47 red supergiant 47 proto planetary disk 47 active galactic nuclei 47 arctic permafrost 47 galaxy supermassive black 47 Voyager spacecraft 47 Spectrograph 47 dwarf galaxy 47 infrared radiation 47 methane hydrate deposits 47 moon Phobos 47 nicknamed Bonneville 47 sediments deposited 47 GRB #B 47 Cygnus Lyra region 47 nebular 47 accretion disks 47 Orionids 47 Betelgeuse 47 isotopic ratios 47 infrared spectra 47 Red Planet 47 spectroscopic measurements 47 called lobate scarps 47 Imaging Spectroradiometer MODIS instrument 47 Caloris Basin 47 Martian 47 constellation Taurus 47 solar flares 47 N. Rathnasree 47 southern constellation Carina 47 moon Mab 47 coronal holes 47 hot Jupiters 47 meteorite impacts 47 Itokawa 47 Deep Impact eXtended Investigation 47 tidal bulge 47 SN #gy 47 HiRISE images 47 Cryosat 47 neutron star 47 intrinsic brightness 47 meteorites 47 galaxy M# [001] 47 micro meteorites 47 heliospheric 47 supernova remnant 47 Anthony Remijan 47 planets Uranus 47 asteroid Itokawa 47 red supergiants 47 elemental composition 47 superheavy elements 47 Lunine 47 active galactic nucleus 47 asteroid belt 47 Globular clusters 47 magnetopause 47 whiz harmlessly 47 Gakkel Ridge 47 photosynthetic organisms 47 ostracods 47 neutrino 47 gravitational tugs 47 axial tilt 47 Earth asteroids 47 Rydberg atom 47 Valles Marineris canyon 47 Sedna 47 potentially habitable planets 47 interstellar dust samples 47 planets circling 47 Wilkinson Microwave Probe 47 blazar 47 Shepherding Spacecraft 47 Saharan Desert 47 planetary atmospheres 47 faint galaxies 47 Hesperian epoch 47 X ray observatory 47 moons Europa 47 Viking orbiters 47 tropic regions 47 NASA Cassini spacecraft 47 Galactic cosmic rays 47 orbiting gamma ray 47 Churyumov Gerasimenko 47 rotating neutron stars 47 planets orbiting sun 47 interstellar distances 47 antimatter particles 47 Comet #P/Churyumov-Gerasimenko 47 planet habitability 47 VIRTIS 47 observable universe 47 Chryse Planitia 47 Pavonis Mons 47 Imaging Spectrometer 47 glow brightly 47 substorm 47 Titan Saturn 47 ESA Mars 47 subglacial lakes 47 THEMIS Image 47 gamma rays 47 meteoritic material 47 spectral signatures 47 galaxy cluster 47 galaxies collide 47 BIFs 47 galactic mergers 47 Comet Tempel 1 47 reionization 47 moon Canup 47 chondritic meteorites 47 ionosphere 47 Earth magnetotail 47 Type Ia supernovas 47 ALH# 47 ionized gases 47 crustal thickness 47 martian surface 47 KT boundary 47 outer planets 47 GRBs 47 ionised 47 Gliese #g 47 noctilucent clouds 47 dwarf spheroidal galaxies 47 HD# [002] 47 moon Dione 47 gravitational interaction 47 evaporite deposits 47 cosmic particles 47 Planck telescope 47 gravitational perturbations 47 -# degrees Fahrenheit [002] 47 nebula 47 lobate 47 Schwarzschild radius 47 CAIs 47 protoplanetary discs 47 Orion nebula 46 EPOCh 46 NASA satellites orbiting 46 cosmic radiation 46 interstellar dust clouds 46 retrograde orbits 46 cosmic ray 46 earthlike 46 Bramley Murton 46 Ithaca Chasma 46 Bernhard Fleck 46 albedo reflectivity 46 flood basalts 46 NASA Spacecraft 46 Supermassive black 46 Tunguska meteorite 46 equatorial 46 coronal mass ejections 46 spacecraft thrusters 46 Cancri e 46 cosmological theories 46 Spudis 46 primordial ingredients 46 foraminifera 46 onboard Chandrayaan 46 Mars CRISM 46 ionized particles 46 ULIRGs 46 solar prominences 46 Opportunity rover 46 fiery reentry 46 planets orbiting 46 neutrino particles 46 Relations Observatory STEREO 46 Palaeozoic sedimentary 46 planet magnetosphere 46 flyby 46 volcanic vents 46 layered bedrock 46 Noctilucent clouds 46 constellation Ophiuchus 46 Kuiper Belt objects 46 microplastics 46 tungsten isotopes 46 Trifid Nebula 46 Foing 46 spatially resolved 46 equatorial belt 46 Triangulum Galaxy 46 auroral 46 Ionosphere Sounding 46 Io volcanoes 46 orbiting spacecraft 46 oceanic plates 46 silicate rocks 46 gamma ray flashes 46 Dry Valleys 46 upper troposphere 46 overlying layers 46 smallest exoplanets 46 -# Celsius [001] 46 elliptical orbits 46 ammonia hydrate 46 absorb photons 46 radar interferometry 46 detect gamma rays 46 scarps 46 outermost layers 46 protoplanets 46 Martian terrain 46 Milky Way 46 Banerdt 46 sunlike star 46 Mars moon Phobos 46 chlorophyll molecules 46 silicates 46 Rosette Nebula 46 Wolf Rayet stars 46 constellation Scorpius 46 Radioactive substances 46 Sensing Satellite LCROSS 46 meteorite fragments 46 Mars Odyssey spacecraft 46 mere fly bys 46 chlorine monoxide 46 occultations 46 thermal vents 46 Virgo cluster 46 habitable 46 ionise 46 Endurance Crater 46 lunar landers 46 quantum particle 46 antihydrogen atoms 46 Titan smoggy 46 solar radii 46 geo stationary orbit 46 warmer latitudes 46 Convection Rotation 46 planets atmospheres 46 lander 46 ray Space Telescope 46 crystalline silicates 46 eccentric orbits 46 X ray emitting 46 Bedout 46 Comet NEAT 46 Alfvén waves 46 Martian rovers 46 cosmic phenomena 46 Fermi Gamma ray 46 aboard ESA Envisat 46 supernovae 46 Gerard Kuiper 46 interstellar space 46 umbral shadow 46 spectroscopically 46 Tempel 1 46 Amundsen Sea 46 neutral mass spectrometer 46 Carolyn Porco Cassini 46 infalling 46 nearby Lubuk Lawe 46 Jupiter moons 46 ferric oxides 46 cluster NGC 46 cratered highlands 46 IntergalaticEarth 46 double helix nebula 46 Jonathan Lunine 46 sulfate aerosols 46 Wolszczan 46 NASA Lunar Prospector 46 extrasolar planets orbiting 46 hypervelocity stars 46 constellation Bootes 46 Red Rectangle 46 Eta Carinae 46 Jupiter moon Io 46 SN #A 46 X ray binary 46 Wassonite 46 twin rover Spirit 46 Martian atmosphere 46 spacecraft 46 Jeffrey Plaut 46 O OREOS 46 NASA THEMIS 46 aerosol particles 46 interferometric synthetic aperture radar 46 geostationary orbits 46 Geologically speaking 46 THEMIS satellites 46 cosmic microwave background 46 carbonaceous chondrites 46 constellation Vulpecula 46 comet Tempel Tuttle 46 Huygens mission 46 organic molecules 46 Sunspots 46 star Spica 46 masers 46 reef habitats 46 celled organisms 46 X ray Spectrometer 46 Spitzer infrared telescope 46 constellation Cassiopeia 46 Martian meteorites 46 Voyager probes 46 supermassive 46 non baryonic 46 NASA Stardust spacecraft 46 ESA Herschel 46 lunar magma 46 collisional 46 axions 46 NASA twin rovers 46 Stephan Quintet 46 Planetary Transits 46 supernova remnants 46 rocky crevices 46 NASA Voyager spacecraft 46 zircon crystals 46 galaxy 46 volcano Olympus Mons 46 Henize #-# 46 shadowed crater 46 optical wavelengths 46 oxidized mercury 46 Chajnantor plateau 46 Mercury magnetosphere 46 magnetotail 46 Ranging spacecraft 46 Toutatis 46 Kraken Mare 46 neutron radiation 46 Super Kamiokande 46 Chicxulub 46 Lava flows 46 Sinus Meridiani 46 extrasolar worlds 46 giant elliptical galaxies 46 antimatter atoms 45 supernova explosion 45 Cassini flybys 45 silicate mantle 45 asteroid impacts 45 equatorial latitudes 45 substorms 45 hydrothermal fluid 45 Phobos 45 gravitational microlensing 45 Diviner 45 transiting planet 45 Trifid 45 aeolian 45 seafloor methane 45 absorbs photons 45 occulted 45 SNR #-#.# 45 Cerro Paranal 45 quark gluon plasma 45 Galactic Plane 45 Dumont d'Urville station 45 Gamma ray bursts 45 Deep Impact craft 45 magmas