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(Click for frequent words.) 74 shadowed craters 74 permanently shadowed craters 69 shadowy craters 68 lunar craters 68 polar craters 63 Martian polar 63 hydrated minerals 63 lunar crust 63 penetrating radar 63 permanently shadowed crater 63 lunar poles 62 permanently shadowed 62 subsurface ocean 62 mineral olivine 61 polar regions 60 Shackleton crater 60 airglow 60 mineralogical composition 60 moon Europa 60 Kuiper Belt Objects 60 Terra Meridiani 60 icy moons 60 shaded craters 60 Jupiter moons Europa 59 Saturn Enceladus 59 phyllosilicates 59 jarosite 59 lunar equator 59 Ontario Lacus 59 extrasolar 58 outer corona 58 interstellar cloud 58 comets asteroids 58 planet Gliese #g 58 Jupiter icy moons 58 cosmological distances 58 X ray wavelengths 58 Syrtis Major 58 Aram Chaos 58 Shackleton Crater 58 Saturn magnetosphere 58 mineral hematite 58 Earthlike 58 planetary nebulas 58 Venusian atmosphere 58 polar latitudes 57 coronal loops 57 aurorae 57 moons orbiting 57 polar stratospheric 57 hydroxyl molecules 57 filamentary structure 57 retroreflector 57 GJ #b [002] 57 silicon monoxide 57 Noctilucent clouds 57 lunar regolith 57 smallest exoplanet 57 phyllosilicate 57 sunlike stars 57 HiRISE image 57 constellation Eridanus 57 thin crescent 57 clathrates 56 potentially habitable 56 sized planets orbiting 56 Diviner instrument 56 spatially resolved 56 Cabeus 56 exosphere 56 lunar soil 56 polar caps 56 Galilean satellites 56 Jovian moon 56 gaseous planets 56 hematite mineral 56 KBOs 56 habitable zones 56 cometary dust 56 Cassini flyby 56 ionized gas 56 Gusev crater 56 smoggy atmosphere 56 Jovian moons 56 infrared telescopes 56 Martian dust 56 Manned missions 56 Kraken Mare 56 Neptune Uranus 56 Candor Chasma 56 ionized gases 56 McMurdo Dry Valleys 56 Corot 9b 56 VIRTIS instrument 56 Cometary 56 equatorial latitudes 56 jovian 56 dirty snowballs 56 retrograde orbit 56 planetary atmospheres 56 supersymmetric particles 56 Diviner 56 subglacial lakes 56 photosphere 55 polar layered 55 Polar Regions 55 icy comets 55 NASA rovers Spirit 55 Lake Untersee 55 magma ocean 55 blocks harmful ultraviolet 55 Upsilon Andromedae b 55 liquid ethane 55 WISE spacecraft 55 hydrosphere 55 Saturn moon Enceladus 55 Cabeus crater 55 planets orbiting stars 55 Saturnian moons 55 Antarctic Dry Valleys 55 lunar craters near 55 Perseus Cluster 55 stratospheric clouds 55 ammonia hydrate 55 sulfate minerals 55 noctilucent 55 graphite whiskers 55 considered seas Lunine 55 solar corona 55 orbiting gamma ray 55 Martian subsurface 55 Upsilon Andromedae 55 Mini SAR 55 ultracold temperatures 55 IBEX spacecraft 55 moon Mimas 55 hydrated silica 55 protoplanetary disks 55 smoothest flattest 55 Great Orion Nebula 55 circumstellar disk 55 lunar meteorites 55 heavily cratered 55 Alfven waves 55 comet McNaught 55 Galilean moons 55 prebiotic molecules 55 Io Europa 55 APXS 55 IRC +# 55 bedrock outcrops 55 Fomalhaut b 55 CMB radiation 55 radial velocity technique 55 gray hematite 55 Planck satellite 55 COROT 7b 55 Earthlike planet 55 Mercury exosphere 55 energetic electrons 55 ESA XMM Newton 55 seabed sediments 55 Samuel Oschin Telescope 54 gamma rays emitted 54 planets Uranus 54 BLG #Lb 54 Neutron stars 54 periodic dimming 54 asteroids comets 54 gaseous methane 54 ejecta blanket 54 dynamical processes 54 Methane hydrates 54 magnetospheric 54 equatorial regions 54 Saturnian moon Titan 54 Kuiper belt object 54 called gray hematite 54 ultracold atoms 54 cosmic ray flux 54 yardangs 54 fainter objects 54 planets orbiting distant 54 zodiacal light 54 exoplanets planets 54 exoplanetary 54 distant supernovas 54 martian surface 54 Corot 7b 54 basalt volcanic 54 polar vortex 54 olivine mineral 54 GJ#b 54 Hellas Planitia 54 Vastitas Borealis 54 carbonate globules 54 sulfate salts 54 Martian equator 54 rubbly 54 circumstellar 54 Fermi telescope 54 diffuse aurora 54 planets comets 54 Gamma ray burst 54 MG J# +# 54 comet nuclei 54 subglacial 54 auroral displays 54 gamma ray emitting 54 planetary surfaces 54 water vapor condenses 54 submillimeter 54 lobate scarps 54 Phoebe orbits 54 NASA QuikScat satellite 54 dusty disks 54 geologically active 54 comet particles 54 magnetic monopoles 54 moonquakes 54 elongated orbits 54 radiometers 54 cryosphere 54 moons Phobos 54 GJ #b [001] 54 planetary nebulae 54 radar altimetry 54 Arsia Mons 54 laser altimeter 54 Bok globules 54 habitable worlds 54 NASA twin STEREO 54 Martian dunes 54 Saturn moons Enceladus 54 coronal holes 54 silicic 54 Saturn Cassini 54 biosignatures 54 cryovolcanism 54 infrared spectrograph 54 constellation Carina 53 icy crust 53 stony meteorites 53 Milky Way halo 53 moon Dione 53 distant supernovae 53 infrared spectra 53 occultations 53 active volcanism 53 ammonia hydrates 53 ionized hydrogen 53 specular reflection 53 extrasolar planetary systems 53 carbonaceous chondrites 53 silicate dust 53 HII regions 53 galactic cosmic rays 53 distant suns 53 astronomical objects 53 proplyds 53 millimeter wavelengths 53 basaltic rocks 53 Bose Einstein condensates 53 umbral shadow 53 chromosphere 53 Rossby waves 53 interstellar boundary 53 protostars 53 inhabitable planets 53 microwave radiometers 53 non baryonic 53 perchlorate salts 53 MARSIS radar 53 noctilucent clouds 53 polar mesospheric clouds 53 ionise 53 Jupiter Uranus 53 filamentary structures 53 Solar TErrestrial RElations Observatory 53 lava tubes 53 spectroscopically 53 subglacial lake 53 #P/Churyumov-Gerasimenko 53 Comet Churyumov Gerasimenko 53 Saturn moon Mimas 53 Wolszczan 53 Cosmic Microwave Background 53 spectral characteristics 53 Cassini flybys 53 Earth magnetotail 53 planets circling stars 53 Surface Composition Spectrometer 53 regolith 53 dense clumps 53 Exoplanets 53 Saturn moon 53 dust enshrouded 53 crystalline solids 53 slender crescent 53 moons Io 53 ice nucleation 53 temperature gradients 53 Mercury magnetosphere 53 Bose Einstein condensate BEC 53 moon Enceladus 53 extrasolar planets orbiting 53 Jupiter moon Io 53 OGLE TR #b 53 planet magnetosphere 53 scarps 53 Saturn moons 53 telescopic observations 53 detect neutrinos 53 relativistic particles 53 Oceanus Procellarum 53 Spitzer infrared 53 Earthlike planets 53 Cepheid variables 53 celestial phenomena 53 interstellar dust grains 53 neutral mass spectrometer 53 active galactic nucleus 53 Bug Nebula 53 Saturnian moon 53 planemos 53 presolar grains 53 emits X rays 53 ecliptic plane 53 infrared spectrometers 53 earthlike planets 53 neutron detector 53 Gas hydrates 53 Orion nebula 52 WISE telescope 52 Caloris 52 emit X rays 52 Epsilon Aurigae 52 visit http:/saturn.jpl.nasa.gov 52 Oort Cloud 52 carbonate minerals 52 volcanic vents 52 gaseous planet 52 comets orbiting 52 Spudis 52 cosmic phenomena 52 spherules 52 Comet Hartley 2 52 rocky planets 52 EPOCh 52 Mesosphere 52 CoRoT satellite 52 constellation Pisces 52 OMEGA instrument 52 cirrus clouds 52 planetary Transits 52 star Spica 52 ionized particles 52 sunlight penetrates 52 sub glacial lakes 52 Geminga 52 axial tilt 52 GALEX 52 Super Earths 52 photosynthetic organisms 52 Europa Ganymede 52 astrobiological 52 ejecta curtain created 52 CoRoT 9b 52 tholins 52 lunar perigee 52 magnetic monopole 52 asteroidal 52 Trifid Nebula 52 X ray emitting 52 volcanic moon Io 52 unmanned probes 52 supercooled liquid 52 visible wavelengths 52 silicate minerals 52 lenticular clouds 52 missing baryons 52 highly elliptical orbits 52 circumstellar disks 52 accretion disks 52 faint galaxies 52 icy moon Enceladus 52 axions 52 Coma Cluster 52 martian soil 52 subsurface 52 AGNs 52 gravitational microlensing 52 Microlensing 52 Orbiter LRO 52 refrozen ice 52 albedo reflectivity 52 AB Aurigae 52 Venusian surface 52 Imaging Spectroradiometer MODIS instrument 52 Saturn outermost 52 called gravitational microlensing 52 spectroscopic measurements 52 Evolution Explorer 52 abyssal plain 52 planets atmospheres 52 Mini TES 52 VISTA telescope 52 Planitia 52 unaided eye 52 vugs 52 polarimetry 52 multiband imaging photometer 52 Pleiades cluster 52 magnetosphere 52 spectral fingerprint 52 Kuiper belt 52 Earth magnetosphere 52 VIRTIS 52 X ray observatory 52 planet HD #b 52 spacecraft orbited 52 Jupiter Saturn 52 polar oceans 52 downwelling 52 Jupiter Ganymede 52 dwarf spheroidal galaxies 52 hydrocarbon reservoirs 52 evaporite deposits 52 lunar maria 52 Compact Reconnaissance Imaging Spectrometer 52 Mount Bosavi 52 eclipsing binaries 52 synchronous orbit 52 cratered highlands 52 Beta Pictoris b 52 Tharsis Rise 52 Martian craters 52 stellar nurseries 52 methane clathrates 52 biosignature 52 Warmer oceans 52 glacial sediments 52 Oort cloud 52 waning gibbous 52 crystalline silicates 52 galactic bulge 52 Mars Uranus 52 protoplanetary discs 52 cosmic magnifying glass 52 SIRTF 51 Di Achille 51 Cat Paw Nebula 51 planetary geologists 51 Veil Nebula 51 gravitational lens 51 Uranus Jupiter 51 Enceladus 51 Omega Centauri 51 Wilkinson Microwave Anisotropy Probe 51 coronal mass ejections CMEs 51 methane hydrate 51 Globular clusters 51 nebular 51 planetary transits 51 planet Gliese #c 51 magnetospheres 51 olivines 51 Elemental mercury 51 cometary 51 silicate rocks 51 albedo feedback 51 upwellings 51 atomic lattice 51 Higgs bosons 51 shallow weedy 51 Orientale Basin 51 Geminid shower 51 quartz feldspar porphyry intrusive 51 bedrock outcropping 51 Mars CRISM 51 Planetary Transits 51 Moderate Resolution Imaging 51 penumbral shadow 51 Hellas Basin 51 Valles Marineris canyon 51 Pavonis Mons 51 X ray binaries 51 polar plateau 51 situ measurements 51 Mazatzal 51 Mercury Uranus 51 meteor impacts 51 Viking orbiters 51 stellar occultation 51 radioactive nuclei 51 Cassini Finds 51 protons collide 51 methane hydrates 51 neutron spectrometer 51 Nili Fossae 51 VB #b 51 hematite goethite 51 condensation nuclei 51 Saturn Jupiter Uranus 51 spectral fingerprints 51 interstellar grains 51 submillimetre wavelengths 51 TrES 4 51 midlatitudes 51 permanently shadowed lunar 51 silicate mantle 51 moon Mab 51 arctic permafrost 51 waning crescent 51 Hubble orbits 51 protoplanetary 51 absorbs sunlight 51 extrasolar planet 51 Herschel Space 51 Foing 51 -# degrees Celsius [001] 51 Rydberg atom 51 Anthony Remijan 51 backscattered 51 moon Io 51 Gliese #c 51 galactic mergers 51 silicate grains 51 XMM Newton 51 comet flyby 51 magnetic substorms 51 polar 51 gamma ray observatory 51 -# degrees Fahrenheit [002] 51 X ray spectrometer 51 Orbiter MRO 51 BP Psc 51 Spectrograph 51 hyper spectral 51 Banerdt 51 nebulae 51 northerly latitudes 51 dwelling organisms 51 spherical halo 51 interstellar clouds 51 THEMIS satellites 51 protoplanet 51 mesospheric 51 moon Titan 51 nebulosity 51 anthropogenic aerosols 51 hydrothermal vent 51 gravitational lensing 51 Eta Aquarid meteor shower 51 ah dus 51 craters 51 meteoroid impacts 51 arctic plains 51 ultraviolet wavelengths 51 -# degrees centigrade [001] 51 heliospheric 51 water vapor 51 algal mats 51 Comet Encke 51 Ring Nebula 51 reef habitats 51 Earth orbiting satellites 51 flood basalts 51 planets constellations 51 brownish haze 51 moons Europa 51 microlensing technique 51 hydrothermal fluid 51 single celled algae 51 Ionospheric Sounding 51 astronomical observations 51 Gravitational waves 51 Isidis Planitia 51 permafrost thaws 51 Cerro Pachon 51 Nasa Mars Reconnaissance 51 star Beta Pictoris 51 Mars Squyres 51 Orionids 51 silicates 51 Jonathan Lunine 51 Climate Experiment GRACE 51 Planck telescope 51 giant elliptical galaxies 51 yttrium barium copper 51 ejecta plume 51 Methane hydrate 51 Jupiter magnetosphere 51 spaceborne 51 ostracods 51 meteoroids 51 metallic nanostructures 51 microbialites 51 ultracold 51 Mars landers 51 Nasa Kepler 51 intracluster 51 thermal vents 51 refugia 51 warmer latitudes 51 electrically conducting 51 seafloor habitats 51 prominences 51 Kuiper belt objects 51 luminous galaxies 51 microshutters 51 paleomagnetic 51 topographical characteristics 50 mesosphere 50 Palaeozoic sedimentary 50 smallest exoplanets 50 Meridiani 50 auroral emissions 50 merging galaxies 50 Stephan Quintet 50 deep convective clouds 50 Geologically speaking 50 RXTE 50 lunar crater 50 Gliese #G 50 Submillimeter Array 50 ferric oxide 50 Fermi Gamma ray 50 electron neutrinos 50 chlorophyll molecules 50 nightglow 50 exoplanets orbiting 50 photosynthetic microbes 50 moonlet 50 antarctic 50 Amundsen Sea 50 prograde 50 Ionosphere Sounding 50 Valles Marineris 50 topological insulators 50 Nikku Madhusudhan 50 icesheets 50 SMBHs 50 SINFONI 50 reentry capsule 50 distant galaxy clusters 50 astrophysical phenomena 50 comet Lulin 50 mantle plumes 50 NASA THEMIS 50 Rayleigh scattering 50 VY Canis Majoris 50 filamentary 50 Orbiting Carbon Observatory OCO 50 Andromeda halo 50 moonless nights 50 crustal thickness 50 polynyas 50 ferric oxides 50 Cosmic ray 50 advection 50 gamma ray observatories 50 nebulas 50 sulfide minerals 50 Enceladus icy 50 Relations Observatory STEREO 50 ionised gas 50 Heterodyne Instrument 50 gravitational lenses 50 trans Neptunian 50 Keck telescopes 50 hydrocarbon accumulations 50 mid latitudes 50 Comet 9P/Tempel 1 50 Mandushev 50 Deep Impact eXtended Investigation 50 isotopic ratios 50 waxing crescent 50 giant gaseous planets 50 reflection nebula 50 lateritic 50 Geminid meteors 50 Ultraviolet rays 50 micron wavelengths 50 Descent Imager Spectral Radiometer 50 exo planet 50 LADEE 50 exo planets 50 mantle convection 50 van Arkel discovery 50 ejecta 50 Galactic Plane 50 PUVA psoralen plus 50 atmospheric circulations 50 Rydberg atoms 50 Trifid 50 sulfidic 50 geostationary orbits 50 exoplanet atmospheres 50 Hot Jupiters 50 abyssal plains 50 habitable planet 50 earthlike 50 comet nucleus 50 Orionid meteors 50 Opportunity rover 50 Infrared Thermal Imaging Spectrometer 50 Quadrantid meteor shower 50 NuSTAR 50 tidal bulge 50 Walruses dive 50 freshwater lakes rivers 50 HESS telescopes 50 Galactic cosmic rays 50 infrared wavelengths 50 Galileo spacecraft 50 moons circling 50 assumed planets circling 50 Cancri e 50 electron diffusion 50 interplanetary spacecraft 50 comet Tempel Tuttle 50 Comet Lulin 50 constellation Hercules 50 meteorite impacts 50 binary asteroids 50 Delta Cephei 50 midlatitude 50 cometary material 50 spectrographic 50 Io volcanoes 50 Comet Hale Bopp 50 coldest driest 50 earthshine 50 chlorine monoxide 50 binary asteroid 50 synchrotron x ray 50 abyssal 50 Cosmic rays 50 Kelvin -# 50 Sensing Satellite LCROSS 50 Sand dunes 50 glows brightly 50 Earth Observation EO 50 Mojzsis 50 comets meteors 50 lithium bearing brines 50 SKY WATCH 50 Sinus Meridiani 50 thermal inertia 50 Martian microbes 50 microscopic phytoplankton 50 structural stratigraphic 50 smoothest flattest spot 50 Goldilocks zone 50 speleothems 50 THEMIS Image 50 Solar Dynamics Observatory 50 CMB photons 50 Uranus Neptune 50 protoplanets 50 Murky waters 50 gamma ray flashes 50 waning crescent Moon 50 spectroscopic analysis 50 Ulysses spacecraft 50 Reiner Gamma 50 magnetotail 50 Saturnian system 50 Spitzer Space Telescope 50 X ray emission 50 chemically reactive 50 terraformed 50 sedimentary deposits 50 HARPS instrument 50 galaxy M# [001] 50 galactic alignment 50 Composite Infrared Spectrometer 50 transiting exoplanet 50 SIM PlanetQuest 50 Titan Saturn 50 Martian lander 50 Higgs particle 50 N. Rathnasree 50 Galaxy Evolution 50 Lunine 50 Comet Machholz 50 habitable planets 50 Martian arctic 50 sundog 50 cosmic microwave background 50 NASA Atmospheric Infrared 50 active galactic nuclei 50 ionizes 50 midge flies 50 Near Infrared Camera 50 Earth ionosphere 50 Orionid 50 protoplanetary disk 50 Dumbbell Nebula 50 radiative cooling 50 neutrino particles 49 solar nebula 49 deepwater corals 49 inner Oort Cloud 49 Gakkel Ridge 49 Ultra violet 49 fungus thrives 49 glow brightly 49 JPL manages 49 temperature inversions 49 coronagraph 49 unconventional superconductivity 49 Martian terrain 49 Svaliava 49 Elysium Planitia 49 planets orbits 49 interstellar dust samples 49 manganese oxides 49 Late Paleozoic 49 Pluto Charon 49 ultraviolet radiation emitted 49 Orion constellation 49 Infrared Mapping Spectrometer VIMS 49 Envisat ASAR 49 Lake Vostok 49 prolific Key Tuffite 49 solar prominences 49 Aeronomy 49 moon Phobos 49 Mars Meridiani Planum 49 Transantarctic Mountains 49 silicate mineral 49 HiRISE images 49 Extrasolar planets 49 distant galaxies 49 Astrological lore 49 extragalactic 49 Cassini radar 49 rubidium vapor 49 lunar surface 49 constellation Aquila 49 largest moon Charon 49 Keck Interferometer 49 atmospheric convection 49 candlelight firelight 49 volcanic lava flows 49 electromagnetic flux 49 fast Yazel 49 Kepler Space Telescope 49 ancient lakebed 49 Sedimentary rocks 49 geothermal gradient 49 thermal infrared 49 waxing gibbous 49 brown dwarfs 49 Saturn outermost ring 49 HD#b 49 ocean sediment cores 49 Martian volcanoes 49 phytoplankton blooms 49 lensing galaxy 49 Earth biosphere 49 Explorer WISE 49 moon Charon 49 constellation Lyra 49 supergiant stars 49 Milankovitch cycles 49 ray Space Telescope 49 flyby Cassini 49 meteor fireball 49 WISE infrared 49 eclipsing binary 49 astrophysical objects 49 Scattered largemouth 49 Ursa Minor 49 Liquid helium 49 iron oxides 49 cenospheres 49 hoarfrost 49 galaxy M# [002] 49 extrasolar planets 49 zinc sulfide 49 ionized oxygen 49 Nasa spacecraft 49 gravitational interaction 49 tundra vegetation 49 TNOs 49 martian atmosphere 49 HiRISE camera 49 microhabitats 49 atmospheric haze 49 Mars moon Phobos 49 afterglows 49 sterile neutrino 49 vapor plume 49 photometer 49 magnetic reconnection 49 galactic magnetic 49 Greenhouse gases trap 49 Arches Cluster 49 eccentric orbits 49 retrograde orbits 49 proto planetary disks 49 infall 49 stellar occultations 49 volcanic tuff 49 CRISM 49 geomagnetic substorms 49 Tethys believes 49 ionize 49 planetary conjunctions 49 basaltic 49 calcic 49 NEAs 49 hexagonal mirrors 49 Opportunity Mars rover 49 iron sulfate 49 faint meteors 49 Endurance crater 49 galactic halo 49 Earthly contamination 49 sulphidic 49 Dwarf galaxies 49 sodium atoms 49 meteoritic material 49 protoplanetary disc 49 planets asteroids 49 lunar highlands 49 Goldilocks planet 49 Dry Valleys 49 geoneutrinos 49 atmospheric oceanic 49 relativistic jets 49 infrared laser beam 49 comets 49 Mate Adamkovics 49 olivine rich 49 ESO Paranal Observatory 49 emission nebula 49 yo yos baited 49 Titan smoggy 49 Mini Thermal Emission 49 layered sedimentary rock 49 detect gamma rays 49 Comet Tempel Tuttle 49 Chajnantor 49 mysterious uncharted 49 orbiting telescopes 49 X ray binary 49 seafloor sediment 49 interferometric 49 micro meteorites 49 infrared spectrometer 49 Elenin 49 NASA satellites orbiting 49 AERONET 49 moonlets 49 Lagoon Nebula 49 galaxies nebulae 49 Convection Rotation 49 deplete oxygen 49 dielectric permittivity 49 Meteor showers 49 IceCube 49 graphane 49 baryonic matter 49 Hubble Space Telescope HST 49 enhanced Raman spectroscopy 49 Gamma ray 49 NEOWISE 49 double helix nebula 49 nanobubbles 49 supermassive 49 rotating neutron stars 49 polariton 49 Neutron Detector 49 P/# A2 49 gamma ray spectrometer 49 Chajnantor plateau 49 astronomical phenomena 49 mineralogical mapping 49 Antarctic icecap 49 weakly interacting 49 nanofilms 49 Stratospheric ozone 49 Global Surveyor spacecraft 49 constellation Aquarius 49 planets orbiting sun 49 Solar flares 49 crystallites 49 subterranean caves 49 impactors 49 microlensing events 49 IR wavelengths 49 Kermadec Arc 49 NASA ICESat 49 transiting planet 49 photochemical reactions