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(Click for frequent words.) 76 crater 61 ejecta 59 Martian craters 59 ejecta blanket 58 icy moons 58 lunar craters 58 polar craters 58 meteoroids 57 heavily cratered 57 scarps 57 lunar crust 56 permanently shadowed craters 56 gullies 56 Shackleton crater 56 impactors 56 Saturn rings 56 moonlets 55 HiRISE images 54 Martian volcanoes 54 comet nucleus 54 KBOs 54 moon Io 54 Saturnian moons 53 martian rocks 53 moons 53 spherules 53 called lobate scarps 53 permanently shadowed 53 Terra Sirenum 52 protoplanetary disks 52 Caloris Basin 52 Valles Marineris 52 meteorite impacts 52 comet 52 Gusev crater 52 Endurance crater 52 meteor impacts 52 NEAs 52 protoplanet 52 comets 51 asteroids 51 cinder cones 51 circumstellar 51 asteroidal 51 icy crust 51 lava tubes 51 lava flows 51 cosmic collisions 51 gaseous planet 51 Saturnian moon 51 Martian equator 51 sedimentary deposits 51 Arsia Mons 51 rocky planets 51 permanently shadowed regions 51 planetesimals 51 bomb craters 51 Planitia 51 lunar soil 51 Asteroid Belt 51 Hellas Basin 51 Syrtis Major 51 galaxies 50 moonlet 50 moons orbiting 50 lobate scarps 50 fault scarps 50 dust devils 50 cryovolcanism 50 crater pocked 50 Saturn moons 50 airbursts 50 rubbly 50 Candor Chasma 50 Meridiani 50 magma boiling 50 stony meteorites 50 asteroids comets 50 asteroid 50 Fomalhaut b 50 shadowed craters 50 cometary debris 50 meteoroid 50 merging galaxies 50 Kuiper belt 50 shallow foxholes 50 protostars 50 gravitational tides 50 landforms 49 distant galaxies 49 galactic disk 49 Herschel Crater 49 Upsilon Andromedae b 49 Earthlike planets 49 accretion disks 49 lensing galaxy 49 moon Mimas 49 protoplanetary disk 49 basaltic rock 49 jarosite 49 solidified lava 49 Saturn moon Enceladus 49 galaxy M# [002] 49 hydrated minerals 49 Martian crater 49 meteorite craters 49 regolith 49 moon permanently shadowed 49 cometary 49 Cabeus crater 49 chondrules 49 NASA rovers Spirit 49 Cabeus 49 lunar crater 49 permanently shadowed lunar 49 Ras Lanouf blasting 49 Quaoar 49 galaxies collide 49 comets asteroids 49 exo planets 49 AGNs 49 exoplanets orbiting 48 inner moons 48 Caloris 48 martian soil 48 ruts 48 protoplanetary disc 48 transiting planets 48 micrometeoroids 48 Cassini flybys 48 Olympus Mons 48 sunlike stars 48 Enceladus 48 shadowy craters 48 Kilauea Iki 48 Upsilon Andromedae 48 olivine mineral 48 windblown sand 48 Eagle Nebula 48 galaxy clusters 48 Sensing Satellite LCROSS 48 potholes 48 martian surface 48 Saturn moon 48 Viking orbiters 48 luminous galaxies 48 cometary dust 48 elongated orbits 48 Martian landscape 48 Sagittarius dwarf galaxy 48 protoplanets 48 phyllosilicates 48 Terra Meridiani 48 fainter objects 48 Endurance Crater 48 calderas 48 Comet 9P/Tempel 1 48 Antennae Galaxies 48 mineral olivine 48 Neutron stars 48 planets asteroids 48 comets orbiting 48 elliptical galaxies 48 martian landscape 48 Nasa spacecraft 48 planets orbits 48 X ray observatories 48 Martian gullies 48 meteor craters 48 jovian 48 gravitational interactions 48 vugs 48 rusted hulks 48 hydrothermal explosions 47 Chicxulub 47 moon Enceladus 47 magma chambers 47 distant galaxy 47 rock outcrop 47 planetary embryos 47 moonquakes 47 circumstellar disks 47 magma ocean 47 proplyds 47 planetary nebulae 47 dwarf galaxies 47 Martian surface 47 Elysium Planitia 47 permanently shadowed crater 47 lunar highlands 47 Sojourner rover 47 Kuiper Belt Objects 47 elliptical orbits 47 Comet Tempel 1 47 volcanic craters 47 globulars 47 gravitational tugs 47 magma chamber 47 moons Europa 47 AU Mic 47 icy moon Enceladus 47 Galilean satellites 47 Tunguska Siberia 47 Andromeda galaxy 47 interstellar clouds 47 Spiral galaxies 47 planets orbiting distant 47 circumstellar disk 47 moon Phobos 47 exosphere 47 Jupiter moon Io 47 HiRISE camera aboard 47 galactic clusters 47 Orion nebula 47 dense clumps 47 galactic mergers 47 Martian dunes 47 ionized hydrogen 47 TNOs 47 RS Ophiuchi 47 Chicxulub Crater 47 Ring Nebula 47 lunar poles 47 lapilli 47 millisecond pulsars 47 planets 47 Borealis basin 47 shells pockmarking homes 47 Lander robotic arm 47 Trojan asteroids 47 colliding galaxies 47 supernova remnants 47 Orion Nebula 47 lava domes 47 Ithaca Chasma 47 Meridiani plains 47 volcanoes 46 HiRISE image 46 lunar regolith 46 GALEX 46 mud volcanoes 46 hummocks 46 planets orbiting sun 46 Shackleton Crater 46 Galileo spacecraft 46 Milky Way halo 46 molten magma 46 Ares Vallis 46 subglacial lakes 46 Martian rocks 46 divots 46 distant supernovae 46 Saturn Cassini 46 Saturnian moon Titan 46 outer corona 46 X ray Observatory 46 gaseous planets 46 coronal mass ejections CMEs 46 carbonate minerals 46 orbiting Hubble Space Telescope 46 tidal tails 46 Perseus Cluster 46 P/# A2 46 stony meteorite 46 Lagoon Nebula 46 meteorites 46 Diviner instrument 46 interstellar grains 46 extrasolar 46 fissure eruption 46 rocks 46 Beta Pictoris b 46 volcanic rock 46 Iapetus 46 Jovian moon 46 solar prominences 46 magnetars 46 Galilean moons 46 planetary geologists 46 Jovian atmosphere 46 Earthlike 46 moon Titan 46 nebulae 46 spherical halo 46 Mount Bosavi 46 basaltic 46 subsurface ocean 46 optical telescopes 46 chromosphere 46 gaping craters 46 distant quasars 46 crater Cabeus 46 polygon shaped 46 infrared telescopes 46 Clementine spacecraft 46 flood basalts 46 mineral hematite 46 Comet Tempel Tuttle 46 Cassini flyby 46 concretions 46 ferric oxides 46 globular clusters 46 spiral nebulae 46 crossbedding 46 elliptical galaxy 46 meteorite fragments 46 Kuiper belt object 46 Halemaumau 45 supernova explosion 45 moon Ganymede 45 Jovian moons 45 planetary nebulas 45 meteor 45 Martian crust 45 solar flares 45 galaxy cluster 45 Tharsis 45 interplanetary dust 45 Vredefort 45 SN #D 45 Jupiter moons Europa 45 Milky Way Galaxy 45 zodiacal light 45 Higgs bosons 45 hardened lava 45 Maunder minimum 45 Martian terrain 45 filamentary structure 45 COROT 7b 45 corrugations 45 indentations 45 trans Neptunian objects 45 Jupiter Ganymede 45 extinct volcanoes 45 Martian rovers 45 retrograde orbit 45 cometary impacts 45 polygon patterns 45 Oort Cloud 45 constellation Carina 45 GJ#b 45 Arches Cluster 45 proto planetary disks 45 crater gouged 45 lunar equator 45 volcanic tuff 45 Trifid Nebula 45 collisional 45 Virgo Cluster 45 starburst galaxies 45 magnetic monopoles 45 red supergiant 45 Jupiter moons 45 cosmic microwave background 45 photosphere 45 shadowed crater 45 neutron star 45 Kuiper belt objects 45 ejecta plume 45 Spitzer Space Telescope 45 polar layered 45 microscopic imager 45 Deccan Traps 45 proto planetary disk 45 moon Dione 45 spiral galaxy NGC 45 basaltic lava 45 Bonneville Crater 45 Corot 7b 45 carbonaceous chondrite 45 dirty snowballs 45 galaxy NGC 45 planetary surfaces 45 Comet Halley 45 nebulas 45 X ray wavelengths 45 circular depressions 45 sulfate salts 45 fissures 45 icy comets 45 lavas 45 igneous rock 45 crater rim 45 noctilucent clouds 45 Caloris basin 45 Stephan Quintet 45 HM Cancri 45 salt crystals 45 Gravitational waves 45 supermassive 45 GJ #b [002] 45 Mojzsis 45 GRBs 45 Oort cloud 45 lunar meteorites 45 crust 45 shallow depressions 45 Evolution Explorer 45 Geminga 45 Mars Orbiter Camera 45 planets orbiting stars 45 Hot Jupiters 45 NASA Cassini spacecraft 45 basalt rocks 45 Beta Pictoris 45 impactor 45 supervolcanoes 45 grabens 44 supernova explosions 44 volcanic eruptions 44 AB Aurigae 44 lunar maria 44 WISE telescope 44 X ray telescopes 44 SN #A 44 olivine crystals 44 glacial boulders 44 GJ #b [001] 44 cratered 44 Cometary 44 iridium layer 44 brightest supernova 44 moons Phobos 44 active volcanism 44 smallest exoplanet 44 Opportunity rover 44 Valles Marineris canyon 44 gravity warps 44 Horsehead Nebula 44 outermost ring 44 Globular clusters 44 Melas Chasma 44 Kuiper Belt objects 44 outer crust 44 Kuiper Belt object 44 Oceanus Procellarum 44 foreground galaxy 44 Saturnian system 44 rotational axis 44 globular star 44 pockmarking 44 infalling 44 Voyager spacecraft 44 coronal loops 44 interacting galaxies 44 pockmarks 44 Mini SAR 44 Earthly contamination 44 molten rock 44 layered bedrock 44 gamma ray emitting 44 turbidites 44 limestone slabs 44 Supernova #A 44 Hellas Planitia 44 lava flowing 44 aurorae 44 overhanging cliffs 44 Zeta Ophiuchi 44 barren expanse 44 Martian dust 44 Martian plains 44 type Ia supernova 44 finely layered 44 undersea volcanoes 44 supernovas 44 Guatemala sinkhole 44 stellar nurseries 44 micro meteorites 44 Veil Nebula 44 X ray binary 44 Dumbbell Nebula 44 planets moons 44 Opportunity Mars rover 44 planets Uranus 44 Meridiani Planum 44 inner asteroid belt 44 subglacial lake 44 olivine 44 Mimas 44 lava 44 grassy mounds 44 Red Rectangle 44 Meteor showers 44 Chasma Boreale 44 cumulus cloud 44 twin rover Spirit 44 lava eruptions 44 hydroxyl molecules 44 hummocky 44 Mars Meridiani Planum 44 depressions 44 periodic dimming 44 sedimentary layers 44 submillimeter 44 martian 44 Bullet Cluster 44 assumed planets circling 44 MG J# +# 44 comet Tempel Tuttle 44 giant elliptical galaxies 44 KT boundary 44 Galaxy Evolution 44 Chicxulub crater 44 neutron stars 44 basaltic rocks 44 filamentary structures 44 meteorite 44 lunar surface 44 Geminid meteors 44 microlensing events 44 EPOXI spacecraft 44 terrestrial planets 44 Tempel 1 44 hematite mineral 44 Mars rover Opportunity 44 bergs 44 hydrated silica 44 Gliese #c 43 seafloors 43 penetrating radar 43 Saturn moon Mimas 43 planetary nebula 43 solar nebula 43 circumstellar dust 43 comet particles 43 basalt 43 Mars moon Phobos 43 asteroid belt 43 Earth asteroids NEAs 43 igneous rocks 43 Omega Centauri 43 cosmic microwave radiation 43 comet nuclei 43 Pleiades cluster 43 Robotic Arm Camera 43 Scheila 43 tire ruts 43 Milky Way 43 tholins 43 HL Tau 43 Meteorites 43 eccentric orbits 43 Explorer WISE 43 supernova remnant 43 planets orbiting 43 gravitational interaction 43 massifs 43 Aram Chaos 43 gravitationally bound 43 smoggy atmosphere 43 transiting exoplanet 43 mineralogical composition 43 Meteor Crater 43 Martian meteorites 43 Comet Shoemaker Levy 43 volcanic vents 43 distant suns 43 Bok globules 43 SN #gy 43 supermassive stars 43 TrES 4 43 OGLE TR #b 43 asteroid Eros 43 waning crescent moon 43 Geminids 43 Saturn Enceladus 43 Epsilon Eridani 43 Orbiter LRO 43 BP Psc 43 Mini TES 43 basalt lava 43 Cat Paw Nebula 43 meteoritic material 43 double helix nebula 43 meteorite bombardment 43 NASA Chandra 43 hydrothermal activity 43 outcrops 43 synchronous orbit 43 super perigee moon 43 afterglows 43 Saturn magnetosphere 43 Victoria Crater 43 APXS 43 explosive eruptions 43 meteoroid impacts 43 phyllosilicate 43 Solar System 43 Type Ia supernova 43 penumbral shadow 43 Kuiper Belt Object 43 NASA Spirit rover 43 NASA LCROSS 43 accretion disk 43 proto cluster 43 Mars Squyres 43 Fermi telescope 43 nicknamed Bonneville 43 Earth asteroids 43 planet orbiting 43 ALH# 43 cosmic cannibal 43 Banerdt 43 planetesimal 43 butter melts 43 red supergiants 43 LCROSS spacecraft 43 unconsolidated sediments 43 fault scarp 43 ionized gas 43 planetoids 43 moon Mab 43 interstellar dust grains 43 infrared telescope 43 comet orbit 43 earthlike planets 43 polar vortex 43 nebula 43 volcanic crater 43 interstellar dust 43 interstellar space 43 gaping crater 43 Antarctic Dry Valleys 43 Arabia Terra 43 meteors 43 Venusian atmosphere 43 polar caps 43 Orionids 43 ultramafic intrusives 43 plumes 43 distant galaxy clusters 43 McMurdo Dry Valleys 43 COROT 43 lava spewing 43 smoothest flattest 43 X ray emission 43 rotating neutron stars 43 Sand dunes 43 gaping potholes 43 chondritic meteorites 43 galactic cores 43 ancient lakebed 43 Gusev Crater 43 Global Surveyor spacecraft 43 brightest meteors 43 plagioclase 43 rock outcrops 43 planet Uranus 43 Elliptical galaxies 43 planet transits 43 carbonaceous chondrites 43 Ngauruhoe 43 Ontario Lacus 43 silicate mantle 43 ridges 43 moon Charon 43 Lake Cheko 43 tectonic activity 43 NASA rover Spirit 43 interstellar particles 43 Tharsis Rise 43 felsic tuff 43 VY Canis Majoris 43 constellation Cassiopeia 43 geoglyphs 43 pyroclastic flow 43 cometary material 43 Mini Thermal Emission 42 G#.# +#.# 42 comet tail 42 orbiting spacecraft 42 Milky Way galaxy 42 andesitic volcanic rocks 42 pallasite meteorite 42 OMEGA instrument 42 moondust 42 overlying layers 42 cluster NGC 42 arctic plains 42 graben 42 Hubble Ultra 42 dwarf spheroidal galaxies 42 thermonuclear reactions 42 metamorphic rock 42 intrinsic brightness 42 stalactites 42 Comet Hale Bopp 42 spherically symmetric 42 spiral galaxies 42 Orbiter MRO 42 Chryse Planitia 42 rock outcropping 42 Kraken Mare 42 volcanism 42 eclipsing binaries 42 SDSS II 42 detect gravitational waves 42 extrasolar planetary systems 42 magnetotail 42 cooled lava 42 planemos 42 diffuse aurora 42 Hollywood esque moonshot 42 gray hematite 42 Pavonis Mons 42 magnetar 42 HD#b 42 spacecraft flyby 42 steam vents 42 faint galaxies 42 boulders 42 interstellar medium 42 meteoritic 42 chemical abundances 42 Nasa Mars Reconnaissance 42 WASP #b 42 Earths crust 42 Swift Tuttle 42 orbits Saturn 42 spheroidal 42 Mossbauer spectrometer 42 silicate dust 42 Vastitas Borealis 42 dusty cocoons 42 landmasses 42 crevasses 42 Phobos 42 horseshoe shaped crater 42 Patagonian glaciers 42 Gravitational lensing 42 Diviner 42 geysers erupting 42 volcanic cones 42 runaway thermonuclear 42 solar corona 42 geysers 42 wrinkle ridges 42 NASA Opportunity rover 42 unmanned probes 42 gravitational perturbations 42 RQ# 42 interstellar cloud 42 glaciers 42 supernova 42 Orionid 42 hypervelocity stars 42 yardangs 42 ULIRGs 42 frost heaved 42 layered outcrops 42 BP Piscium 42 Cosmic Microwave Background 42 perchlorate salts 42 Bedout 42 spiral galaxy M# 42 GRB #B 42 SN#A 42 Sensing Satellite 42 Lunine 42 pock marks 42 vortices 42 X ray emitting 42 cratered highlands 42 Isidis Planitia 42 Comet Machholz 42 Hanny Voorwerp 42 tectonic faults 42 ancient petroglyphs 42 visible wavelengths 42 Kaliurang located 42 cosmic rays 42 Keck telescopes 42 WD5 42 transiting planet 42 oceanic plates 42 Wilkinson Microwave Anisotropy Probe 42 KH #D 42 NGC# 42 brown dwarfs 42 silicon monoxide 42 Supernovae 42 highly magnetized neutron 42 malachite mineralization 42 quasar 42 prominences 42 Cosmic rays 42 observable universe 42 volcano Olympus Mons 42 Murchison meteorite 42 moonscapes 42 celestial object 42 volcanic lava flows 42 sediments deposited 42 QQ# 42 Crab Nebula 42 Halema'uma'u Crater 42 erupt explosively 42 stone cairns 42 Type 1a supernova 42 martian meteorites 42 lava flowed 42 binary quasar 42 gravitational lenses 42 Martian 42 HD #b [002] 42 HiRISE 42 Comet Hartley 2 42 planet magnetosphere 42 starlight 42 desolate desert 42 volcanic activity 42 glacial sediments 42 martian atmosphere 42 Extrasolar planets 42 Tarantula Nebula 42 Betelgeuse 42 silicic 42 galaxy M# [001] 42 anticlines 42 planet HD #b 42 farside 42 volcanic cone 42 Yellowstone supervolcano 42 moon Europa 42 umbral shadow 42 Ground penetrating radar 42 cosmological distances 42 basalt rock 42 Craters 42 Martian soil 42 basalt columns 42 maser emission 42 dwarf galaxy 42 NASA Lunar Prospector 42 volcanic moon Io 42 asteroids orbiting 42 Lunar Crater Observation 42 volcanic caldera 42 hillocks 42 novae 42 Eta Carinae 42 dust particles 42 Pluto Charon 42 proto galaxies 42 ultraviolet wavelengths 41 microquasar 41 unaided eye 41 thin crescent 41 Gliese #g 41 NASA rovers 41 observatories 41 Phoebe orbits 41 sinkholes 41 volcanic lava 41 arcseconds 41 bolide 41 Samuel Oschin Telescope 41 Toutatis 41 carnotite 41 mantle lithosphere 41 clay subsoil 41 Mars 41 abyssal plains 41 Mandushev 41 Martian polar 41 habitable planets 41 promontories 41 Scorch marks 41 phreatic 41 Deep Impact probe 41 lunar orbiters 41 Lava flows 41 galactic cosmic rays 41 silicates 41 Hubble observations 41 mineralized boulders 41 sea hydrothermal vent 41 Glass shards 41 moon 41 sastrugi 41 nebulas clouds 41 skid marks 41 orbiting Saturn 41 Laurentide ice sheet 41 SN #cr 41 gamma ray bursts 41 Comet #P 41 cosmic magnifying glass 41 subglacial 41 Gerard Kuiper 41 icesheets 41 gibbous 41 astrophysical objects 41 CMB radiation 41 loess 41 distant quasar 41 volcanic 41 exoplanets 41 Herschel telescope 41 lateritic 41 magma 41 extrasolar planet 41 gravitationally 41 dusty disks 41 Squyres 41 Larry Soderblom 41 massive sulphide lenses 41 supernovae 41 millisecond pulsar 41 magnetosphere 41 sunspots 41 particles 41 chuckholes 41 protoplanetary discs 41 swirling dust devils 41 elemental abundances 41 coronal mass ejections 41 Mare Imbrium 41 pyroclastic 41 Virgo cluster 41 caldera 41 Cygnus Lyra region 41 Triangulum Galaxy 41 look distractingly cartoony 41 high redshift galaxies 41 supersymmetric particles 41 Haumea 41 telescopic observations 41 mesosphere 41 gulleys 41 starquakes 41 type Ia supernovae 41 heliosphere 41 Stromatolites 41 basalts 41 Supermassive black 41 Infrared Thermal Imaging Spectrometer 41 LCROSS 41 asteroid impacts 41 pyroclastics 41 gaseous envelope 41 sunlike star 41 gouged crater 41 planets circling 41 relativistic jets 41 moonlike 41 Racetrack Playa 41 supernovae explosions 41 oblate spheroid 41 laser altimeter 41 inhabitable planets 41 steam eruptions 41 mineralized outcrops 41 rover Spirit 41 active galactic nuclei 41 spacecraft orbiting 41 reentry capsule 41 Fornax cluster 41 lander robotic arm 41 Mars rovers Spirit 41 NASA twin rovers 41 explosive volcanism 41 sized planets orbiting 41 paleomagnetic 41 journal Icarus 41 jet contrails 41 SMBH 41 blue supergiant 41 Hadley Rille 41 constellation Virgo 41 calcite 41 hot Jupiters 41 thin wispy clouds 41 planet HD#b 41 infrared spectra 41 striations 41 infalling gas 41 Taurus Littrow 41 Alfven waves 41 galactic halo 41 Jibsheet 41 Io Europa 41 Bug Nebula 41 lunar magma 41 heliosheath 41 magma molten rock 41 aerosol particles 41 moon Canup 41 gouges 41 occultations 41 HII regions 41 whiz harmlessly 41 Comet McNaught 41 CMB photons 41 exoplanetary 41 faraway galaxies 41 Neukum 41 debris