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(Click for frequent words.) 71 Polar Regions 63 polar caps 63 polar 62 permanently shadowed craters 61 permanently shadowed regions 61 cryosphere 60 subsurface ocean 60 mid latitudes 59 subglacial lakes 58 polar vortex 58 polar ice 57 Arctic Ocean 57 Antarctica 57 exosphere 57 stratospheric ozone 57 Arctic 57 hydrological cycle 57 Venusian atmosphere 57 midlatitudes 56 permafrost 56 solar corona 56 equatorial regions 56 ozone depletion 56 shadowed craters 56 polar icecap 56 greenhouse warming 56 Saturn moon Enceladus 56 Martian polar 56 polar craters 56 mesosphere 56 hydrated minerals 55 icy moons 55 Antarctic 55 southern latitudes 55 oceans 55 latitudes 55 moon Enceladus 55 auroral displays 55 polar oceans 55 Galilean satellites 55 lunar poles 55 upper troposphere 54 glaciers 54 Jupiter moons Europa 54 northern latitudes 54 ultraviolet wavelengths 54 Martian surface 54 stratospheric clouds 54 Amundsen Sea 54 permanently shadowed 54 Enceladus 54 visible wavelengths 54 magnetotail 54 astrobiological 54 infrared wavelengths 54 Noctilucent clouds 54 solar irradiance 54 Rossby waves 53 noctilucent clouds 53 icecap 53 atmospheric aerosols 53 Antarctic Peninsula 53 Saturnian moon 53 water vapor 53 moon Europa 53 albedo 53 X ray wavelengths 53 Ny Alesund 53 shadowy craters 53 heliosphere 53 atmospheric carbon dioxide 53 polar latitudes 53 troposphere 53 Greenland ice 53 radar altimetry 53 terrestrial ecosystems 53 astronomical objects 53 Mercury flyby 53 Weddell Sea 52 cometary 52 Jovian moon 52 fainter objects 52 phyllosilicates 52 sub glacial lakes 52 melting permafrost 52 stratospheric ozone depletion 52 icecaps 52 Ulysses spacecraft 52 mountain glaciers 52 magnetosphere 52 cryovolcanism 52 circumpolar 52 infrared radiation 52 galactic cosmic rays 52 aerosol concentrations 52 hydrosphere 52 Hellas Basin 52 exoplanetary 52 arctic 52 Earth magnetosphere 52 polar stratospheric 52 protective ozone layer 52 martian surface 52 aurorae 52 planetary atmospheres 52 Syrtis Major 52 airglow 52 Palaeocene Eocene Thermal Maximum 51 Dry Valleys 51 permanently shadowed crater 51 AERONET 51 magnetic substorms 51 oceanic circulation 51 climate modellers 51 Antarctic Dry Valleys 51 midlatitude 51 atmospheric circulation 51 Antarctic ice 51 telescopic observations 51 Brigham Grette 51 lunar craters 51 atmospheric methane 51 aerosol particles 51 auroral activity 51 ionosphere 51 atmospheric CO2 levels 51 GJ#b 51 habitable zones 51 Corot 9b 51 active volcanism 51 undersea volcanoes 51 microbial ecosystems 51 gaseous planet 51 aerosols 51 Himalayan river basins 51 photosphere 51 Fomalhaut b 51 IPY 51 extrasolar planets 51 infrared telescopes 51 volcanic plumes 51 volcanism 51 comet nucleus 51 atmospheric chemistry 51 permafrost thaws 51 Amundsen Sea Embayment 51 mantle plumes 51 Eemian 51 retreating glaciers 51 interstellar boundary 51 Cassini flyby 51 heavily cratered 50 Ontario Lacus 50 tropics 50 Lake Vostok 50 Antarctic icecap 50 Fram Strait 50 Arctic permafrost 50 outer corona 50 planet 50 receding glaciers 50 ocean basins 50 coldest driest 50 Cosmic Microwave Background 50 boreal regions 50 paleoclimate 50 Snowball Earth 50 subglacial 50 moon permanently shadowed 50 glacial cycles 50 Otto Bliesner 50 Galileo spacecraft 50 axial tilt 50 ammonia hydrates 50 Vastitas Borealis 50 Tibetan Plateau 50 temperate regions 50 cosmic rays 50 albedo feedback 50 moon Titan 50 substorms 50 substorm 50 Corot 7b 50 Antartica 50 infrared spectra 50 sunspot activity 50 GZK cutoff 50 equatorial Pacific Ocean 50 tropical troposphere 50 Bernhard Fleck 50 Greenland icecap 50 Manned missions 50 Saturnian moon Titan 50 springtime ozone 50 cosmic ray flux 50 Shackleton crater 50 Milankovitch cycles 50 Earthlike planet 50 tropopause 50 CoRoT satellite 50 Michael Studinger 50 Earthlike planets 50 greenhouse gas concentrations 50 thermosphere 50 Martian volcanoes 50 EPOCh 50 Aram Chaos 50 ozone layer 50 clathrates 50 cosmic microwave background 50 tropic regions 50 icesheets 50 Orbiter LRO 50 Svalbard archipelago 50 CoRoT 9b 50 Saturn Enceladus 50 Antarctic glaciers 50 biosignatures 50 Laurentide ice sheet 50 landforms 50 CryoSat mission 50 cometary impacts 50 Jupiter moon Io 50 asteroids comets 50 glaciological 50 X ray emission 49 tropospheric ozone 49 Abdalati 49 comets asteroids 49 equatorial latitudes 49 diffuse aurora 49 Lake Untersee 49 millimeter wavelengths 49 atmospheric oceanic 49 Cabeus crater 49 ICESCAPE 49 HD #b [002] 49 anthropogenic greenhouse gases 49 Gakkel Ridge 49 atmospheric circulations 49 Mercury exosphere 49 Envisat satellite 49 solar flares 49 McMurdo Dry Valleys 49 antarctic 49 warmings 49 Wolszczan 49 deglaciation 49 Laptev Sea 49 Last Glacial Maximum 49 lunar crust 49 meteorite impacts 49 Kuiper belt 49 Arctic icecap 49 coastal upwelling 49 interglacial period 49 Serreze 49 amplifying feedbacks 49 Isidis Planitia 49 anthropogenic aerosols 49 sun corona 49 climatic variability 49 Medieval Warm Period 49 iceberg calving 49 alpine glaciers 49 deepwater corals 49 seafloor sediments 49 Mini SAR 49 comets 49 chromosphere 49 Velicogna 49 lunar surface 49 subglacial lake 49 planet magnetosphere 49 radiative forcing 49 volcanically active 49 Wilkinson Microwave Anisotropy Probe 49 Agulhas Current 49 dynamical processes 49 supervolcanoes 49 Cryogenian period 49 chlorine monoxide 49 interstellar clouds 49 carbon dioxide concentrations 49 auroral 49 geologically active 49 hydrothermal activity 49 luminous galaxies 49 Jakobshavn Isbrae 49 CMB radiation 49 scarps 49 earthshine 49 Saturn magnetosphere 49 Martian equator 49 situ measurements 49 shaded craters 49 distant supernovae 49 ICESat 49 Alfven waves 49 polar mesospheric clouds 49 Greenland glaciers 49 NASA QuikScat satellite 48 equator 48 Martian atmosphere 48 outer planets 48 Earth asteroids 48 Bellingshausen Sea 48 deep convective clouds 48 infrared wavelength 48 glacial interglacial 48 hydrologic cycle 48 Stratospheric ozone 48 climatologically 48 supersymmetric particles 48 GJ #b [002] 48 Northern Hemisphere 48 Rignot 48 Envisat ASAR 48 Kuiper Belt Objects 48 Upsilon Andromedae b 48 Antarctic peninsula 48 magnetic reconnection 48 Great Conveyor Belt 48 poleward shift 48 cometary dust 48 protoplanetary disks 48 harmful ultraviolet radiation 48 subpolar 48 glacial melting 48 tectonic activity 48 journal Meteoritics 48 Luterbacher 48 Alaskan glaciers 48 Saturn rings 48 tidewater glaciers 48 Martian landscape 48 basaltic rocks 48 astrobiologists 48 Svalbard 48 astronomical observations 48 thawing tundra 48 Igor Semiletov 48 Greenland icesheet 48 NASA Cassini spacecraft 48 carbonate minerals 48 extrasolar 48 extrasolar planet 48 cirrus clouds 48 cosmic phenomena 48 Saturn moons 48 Cryogenian 48 martian atmosphere 48 austral summer 48 -# degrees Fahrenheit [002] 48 NASA satellites orbiting 48 smallest exoplanet 48 moon Charon 48 glaciations 48 missing baryons 48 Red Planet 48 exoplanet 48 martian 48 subtropical oceans 48 Arctic Circle 48 Greenland 48 interstellar distances 48 optical wavelengths 48 flood basalts 48 sun ultraviolet radiation 48 planet HD #b 48 astrophysical phenomena 48 Jonathan Lunine 48 astrophysical 48 shrinking glaciers 48 planets orbiting stars 48 Martian dunes 48 Cryosat 48 Planck satellite 48 Omar Baddour 48 unmanned probes 48 MARSIS 48 sulphate aerosols 48 cosmological distances 48 Antarctic Circumpolar Current 48 methane hydrates 48 N. Rathnasree 48 ultra violet radiation 48 Quaternary Period 48 Nili Fossae 48 optical telescopes 48 planets Uranus 48 Cabeus 48 British Antarctic Survey 48 Cosmic ray 48 Composite Infrared Spectrometer 48 arctic plains 48 Dronning Maud Land 48 Carl Gustaf Lundin 48 Europa Ganymede 48 mid Pliocene 48 Melting glaciers 48 southernmost continent 48 Higgs particle 48 Saturn auroras 48 tidewater glacier 48 Galilean moons 48 Martian arctic 48 XMM Newton 48 Ellesmere Island 48 Hellas Planitia 47 tropical latitudes 47 NSIDC 47 sulfate aerosols 47 mineral olivine 47 outlet glaciers 47 distant galaxies 47 Cosmic rays 47 KBOs 47 methane clathrates 47 Greenland Ice 47 interglacial periods 47 albedo reflectivity 47 Ozone depletion 47 meteor impacts 47 Svalbard Islands 47 paleoclimatologists 47 ultraviolet UV radiation 47 Comet Hale Bopp 47 magnetospheric 47 glacial melt 47 lunar perigee 47 Diviner instrument 47 permafrost melts 47 icy crust 47 icesheet 47 Kiruna Sweden 47 stellar nurseries 47 polar icecaps 47 flyby Cassini 47 volcanic vents 47 Earthlike 47 Gusev crater 47 interstellar dust 47 atmospheric CO2 47 multi decadal 47 ocean acidity 47 Glaciologists 47 Oort Cloud 47 SIRTF 47 2C #.#F 47 thermal inertia 47 infrared astronomy 47 Paleoclimate 47 OGLE TR #b 47 phyllosilicate 47 Rosetta spacecraft 47 Terra Meridiani 47 UA Lunar 47 gas hydrates 47 hematite mineral 47 magma ocean 47 temperate zones 47 crustal thickness 47 planets atmospheres 47 paleoclimatic 47 extrasolar planetary systems 47 Jakosky 47 GJ #b [001] 47 lithosphere 47 Service WGMS 47 SPICAM 47 teleconnections 47 Mojzsis 47 asteroids 47 mantle convection 47 ejecta 47 oxidized mercury 47 laser altimeter 47 planetary surfaces 47 temperate forests 47 spectroscopic measurements 47 Microlensing 47 Mars Squyres 47 mineralogical composition 47 climate modelers 47 meteoroids 47 ecoregions 47 Saturn moon 47 VIRTIS 47 meteoroid 47 Hik 47 orbiting gamma ray 47 Geminid shower 47 exoplanet atmospheres 47 comets orbiting 47 climatic variations 47 ESA XMM Newton 47 celestial phenomena 47 neutrino particles 47 orbiting observatory 47 polar plateau 47 IceBridge 47 Martian soil 47 Saturnian system 47 Epsilon Aurigae 47 auroras 47 Jovian moons 47 Chasma Boreale 47 Comet Hartley 2 47 gaseous planets 47 Titan Saturn 47 comet 47 Voyager spacecraft 47 subarctic 47 coronal loop 47 acidifying oceans 47 microlensing events 47 Polar Vortex 47 Saturnian moons 47 terrestrial planets 47 cosmic ray intensity 47 neutrino detectors 47 NASA Mars Odyssey 47 melting ice 47 Neptune Uranus 47 innermost planet 47 Gamma ray burst 47 oceanic 46 Transantarctic Mountains 46 biodiversity hotspots 46 Ny Ålesund 46 oceans airways 46 ESA Mars 46 anthropogenic CO2 emissions 46 Robert Bindschadler 46 sedimentary deposits 46 sunlike stars 46 Thawing permafrost 46 moons orbiting 46 Cancri e 46 Siberian Traps 46 solar nebula 46 coccolithophores 46 sea hydrothermal vents 46 olivine mineral 46 Jakobshavn 46 Mercury magnetosphere 46 subtropical regions 46 aboard ESA Envisat 46 ENSO cycle 46 Meridiani 46 Year IPY 46 Hubble Space Telescope HST 46 ice melts 46 -# degrees Celsius [001] 46 Martian craters 46 Greenland Antarctica 46 icy moon Enceladus 46 Greenhouse gases 46 interplanetary spacecraft 46 X ray telescopes 46 Nares Strait 46 atmospheric ozone 46 paleomagnetic 46 astrobiology 46 Earth magnetotail 46 yardangs 46 ocean salinity 46 temperate latitudes 46 NEAs 46 ultraviolet radiation 46 geomagnetic substorms 46 journal Geophysical Research 46 Antarctica EPICA 46 GHG concentrations 46 paleoclimatology 46 Valles Marineris 46 photochemical reactions 46 Solar Terrestrial Physics 46 Contrails 46 smoggy atmosphere 46 Gliese #c 46 glacial ice 46 Permafrost 46 NASA rovers Spirit 46 hydroxyl molecules 46 rocky planets 46 underwater volcanos 46 Earth orbiting satellites 46 Waleed Abdalati 46 Saturn moon Mimas 46 Qinghai Tibet plateau 46 temperature reconstructions 46 orbiting spacecraft 46 climatic anomalies 46 Earth ozone layer 46 geomicrobiology 46 martian meteorites 46 Antarctic continent 46 North Pole 46 spacefaring nations 46 noctilucent 46 stratospheric ozone layer 46 IceCube 46 longwave radiation 46 Hubble observations 46 potentially habitable 46 poleward 46 Comet McNaught 46 Waleed Abdalati director 46 interstellar dust grains 46 geomagnetism 46 volcanic activity 46 subduction zones 46 temperature gradients 46 planetary warming 46 slender crescent 46 geostationary orbits 46 melting glaciers 46 Mars Odyssey orbiter 46 HiRISE image 46 icefields 46 permafrost melting 46 reef habitats 46 Huygens spacecraft 46 coldest windiest 46 glacier melts 46 snowier winters 46 HD#b 46 ESA Envisat satellite 46 Bruce Jakosky 46 glacial retreat 46 protons collide 46 marine ecosystems 46 moons Phobos 46 starquakes 46 ionized gas 46 Martian 46 Lake Yoa 46 Earth ionosphere 46 asteroid impacts 46 Explorer WISE 46 twin Voyager spacecraft 46 manmade CO2 emissions 46 asteroid Vesta 46 heliopause 46 Patagonian glaciers 46 northerly latitudes 46 WMO 46 Warmer oceans 46 auroral emissions 46 prebiotic chemistry 46 WASP #b 46 masers 46 Little Ice Age 46 meltwater 46 Permian extinction 46 highly elliptical orbits 46 APXS 46 equatorial 46 heliosheath 46 Earth Observation EO 46 glaciers retreating 46 energetic electrons 46 infrared spectrometers 46 Solar Dynamics Observatory 46 atmospheric 46 jovian 46 magnetic monopoles 45 cosmic ray 45 elliptical orbits 45 spacecraft flyby 45 AB Aurigae 45 atmospheric concentrations 45 Qinghai Tibet Plateau 45 Eta Aquarid meteor shower 45 interstellar medium 45 COROT 45 polarimetric 45 gravitational microlensing 45 VIRTIS instrument 45 photosynthetic organisms 45 exoplanets 45 penetrating radar 45 Earth 45 Relations Observatory STEREO 45 TrES 4 45 Yinghuo 1 45 perihelion 45 Upsilon Andromedae 45 upwellings 45 icy comets 45 orbital eccentricity 45 western Antarctic Peninsula 45 ° C warmer 45 Holocene epoch 45 planets 45 cyanobacterial blooms 45 Imaging Spectroradiometer MODIS instrument 45 equatorial waters 45 anomalously warm 45 permafrost degradation 45 magnetospheres 45 Ross Ice Shelf 45 glacier 45 planetary nebulae 45 thermohaline circulation 45 Mandushev 45 northern hemisphere 45 planemos 45 manmade greenhouse gases 45 coronal mass ejections 45 Envisat 45 NASA THEMIS 45 Lunine 45 microlensing 45 Chukchi Cap 45 Orbiter MRO 45 planet Gliese #c 45 Caloris 45 subsurface 45 distant supernovas 45 journal Icarus 45 paleoclimate records 45 atmospheric phenomena 45 ammonia hydrate 45 NASA ICESat 45 Mars northern latitudes 45 anthropogenic climate 45 Kelvin -# 45 abyssal plains 45 planet Gliese #g 45 GRBs 45 ULIRGs 45 glacier melt 45 ringed planet 45 melting glacial 45 cratered highlands 45 boreal 45 seabed sediments 45 Svedhem 45 sunspots 45 HiRISE camera 45 Pleistocene Ice Age 45 RXTE 45 Kraken Mare 45 Martian dust 45 Cassini Huygens 45 moons Io 45 Gravitational waves 45 moonquakes 45 neutrinos 45 neutron spectrometer 45 chlorine peroxide 45 Cassini flybys 45 submillimeter 45 moons Europa 45 neutrino telescope 45 GALEX 45 Arctic tundra 45 elongated orbits 45 Klekociuk 45 lowermost mantle 45 Jay Zwally 45 Larsemann Hills 45 anthropogenic warming 45 sulphate particles 45 Puijila 45 lunar meteorites 45 Melting ice 45 MESSENGER 45 amplification Zwally 45 ice calved 45 periodic dimming 45 penumbral shadow 45 Solar System 45 Stardust NExT mission 45 geomagnetic field 45 GOCE 45 circumstellar disks 45 IRC +# 45 katabatic winds 45 Iapetus 45 Doppler shifts 45 inhabitable planets 45 Jupiter icy moons 45 sulfate aerosol 45 comets meteors 45 polarimetry 45 celestial sphere 45 gamma ray bursts 45 HiRISE images 45 nightside 45 micro meteorites 45 coronal mass ejections CMEs 45 Herschel Space 45 polar orbiting satellites 45 spicules 45 active galactic nuclei 45 Mars 45 ocean 45 neutrino mass 45 plate tectonics 45 Mauna Kea Hawaii 45 melting icebergs 45 advection 45 filamentary structure 45 VY Canis Majoris 45 harmful ultraviolet UV radiation 45 Orion Nebula 45 orbiting Hubble Space Telescope 45 cosmic ray particles 45 planetary geologists 45 sterile neutrino 45 Fermi telescope 45 constellation Centaurus 45 cometary nucleus 45 Adélie penguins 45 Spitzer Space Telescope 45 atmospheric CO 45 Spitsbergen 45 CO2 concentrations 45 Orionids 45 interstellar particles 45 thermal gradient 45 retrograde orbit 45 Indian Ocean Dipole 45 detect gravitational waves 45 Sermilik Fjord 45 infrared spectrometer 45 thermal infrared 44 Opposes drilling 44 Greenhouse gases trap 44 seamounts 44 molten magma 44 icefalls 44 EPOXI mission 44 Type Ia supernovas 44 Spitzbergen 44 glaciology 44 interstellar dust samples 44 Earth Observation Programmes 44 oceanic crust 44 galactic cosmic ray 44 downwelling 44 radial velocity method 44 cosmic radiation 44 glacial fjord 44 Gas hydrates 44 polar bear habitat 44 Martian meteorites 44 Saturn Cassini 44 planets orbiting distant 44 Atlantic meridional overturning 44 Mars landers 44 Gamma rays 44 COROT 7b 44 Bindschadler 44 gravitational lens 44 Medieval Warming Period 44 NASA Wilkinson Microwave 44 asteroid collisions 44 Gliese #d 44 climate forcings 44 Mars Odyssey 44 Antarctic ozone 44 Prydz Bay 44 extrasolar planets orbiting 44 Alaskan tundra 44 Vatnajökull 44 Kerguelen Plateau 44 Quadrantid meteor shower 44 heliospheric 44 Martian gullies 44 Brenda Ekwurzel climate 44 planet HD#b 44 coronal loops 44 anthropogenic carbon dioxide 44 Caloris Basin 44 Gamma ray bursts 44 gamma ray flashes 44 Compact Reconnaissance Imaging Spectrometer 44 spatially resolved 44 Siberian Arctic 44 glaciation 44 mesospheric 44 geosynchronous satellites 44 Ozone layer 44 cometary debris 44 Martian terrain 44 Kepler Space Telescope 44 supercomputer simulations 44 Orbiting Carbon Observatory OCO 44 planets circling stars 44 KT boundary 44 biogeochemical 44 lobate scarps 44 radiative 44 glaciologists 44 Latady Island 44 Mars CRISM 44 habitable planets 44 Comet Machholz 44 moon Mimas 44 Wilfried Haeberli 44 methane CH4 44 NEOWISE 44 Oort cloud 44 tropospheric 44 lunar equator 44 Saharan dust 44 ecliptic plane 44 Fermi Gamma ray 44 MAR ECO 44 Quadrantids 44 Earth thermosphere 44 continental crust 44 Solar flares 44 EPOXI 44 Huygens mission 44 Southern Annular Mode 44 geoneutrinos 44 CRISM 44 surface temperatures SSTs 44 biogeochemical cycles 44 coronal holes 44 stellar occultation 44 AKARI 44 quark gluon plasma 44 planetary 44 warm interglacial periods 44 HARPS instrument 44 Io volcanoes 44 crustal movements 44 sized planets orbiting 44 orbiting Mars Odyssey 44 ESA Integral 44 Sunspots 44 palaeoclimate 44 bedrock outcrops 44 microplastics 44 asteroid Eros 44 melting icecaps 44 exoplanets orbiting 44 STEREO spacecraft 44 2oC 44 Mark Serreze 44 Kuiper Belt 44 terrestrial biosphere 44 observatories 44 aurora borealis 44 nightglow 44 dimensional atlas 44 NCAR scientist 44 Kilimanjaro glaciers 44 boreal forest 44 Cassini 44 Comet Lulin 44 runaway greenhouse 44 glaciers melt 44 Di Achille 44 Exoplanet 44 BP Psc 44 planetary Transits 44 Siberian permafrost 44 Cassini radar 44 gamma ray burst 44 vegetation greenness 44 polar expeditions 44 Maunder minimum 44 lavas 44 Io Europa 44 geomagnetic 44 geothermal gradient 44 global warming 44 THEMIS 44 meridional overturning circulation 44 galactic disk 44 smoothest flattest 44 Ice Ages 44 #.#C #.#F [003] 44 brightest comet 44 tiny airborne particles 44 Ken Herkenhoff 44 composite infrared spectrometer 44 Comet #P 44 Oceanographers 44 auroral oval 44 sunspot cycle 44 extragalactic 44 NuSTAR 44 Subarctic 44 Shackleton Crater 44 ray Space Telescope 44 moonlets 44 Volker Liebig ESA 44 marine habitats 44 gravitational radiation 44 Planck spacecraft