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(Click for frequent words.) 63 comets asteroids 62 meteor impacts 62 icy comets 60 coronal loops 60 coronal mass ejections CMEs 60 asteroids comets 60 planetesimals 60 circumstellar 60 Phoebe orbits 59 comet Tempel Tuttle 59 meteorite impacts 59 highly elliptical orbits 59 Saturn outermost ring 59 Martian dust 59 Kuiper belt objects 58 filamentary structure 58 Upsilon Andromedae 58 retrograde orbits 58 Jupiter icy moons 58 proto planetary disk 58 jovian 58 cometary dust 57 Cosmic Microwave Background 57 interstellar dust clouds 57 asteroidal 57 Saturn moon Mimas 57 comets orbiting 57 protoplanet 57 spacecraft flyby 57 Gravitational waves 57 dirty snowballs 57 meteorite bombardment 57 Mojzsis 57 hydrosphere 57 retrograde orbit 57 Saturn outermost 57 asteroid collisions 57 Kuiper Belt Objects 56 Alycia Weinberger 56 moonquakes 56 supernova explosion 56 energetic electrons 56 infalling 56 interstellar clouds 56 extrasolar 56 planetary orbits 56 solar prominences 56 Wolszczan 56 RS Ophiuchi 56 mineral olivine 56 protoplanets 56 moons orbiting 56 axial tilt 56 Earthly contamination 56 moonlet 56 mantle plumes 56 olivine mineral 56 icy moons 56 collisional 56 galactic cosmic rays 56 magma ocean 56 Galactic cosmic rays 56 meteoroid 56 sulfate aerosols 56 asteroid impacts 56 exo planet 56 nebular 55 Tharsis Rise 55 interstellar dust grains 55 carbonate minerals 55 Late Heavy Bombardment 55 cosmic ray flux 55 solar nebula 55 exosphere 55 Astrological lore 55 reionization 55 Corot 7b 55 tholins 55 carbonate globules 55 smoothest flattest spot 55 inhabitable planets 55 planets comets 55 COROT 7b 55 supernova explosions 55 permanently shadowed craters 55 distant supernovas 55 unmanned probes 55 Foing 55 Gamma ray burst 55 V# Mon 55 lunar meteorites 55 moon Mimas 55 thermonuclear reactions 55 distant supernovae 55 circumstellar disks 55 Evolution Explorer 55 planets asteroids 55 solar corona 55 VY Canis Majoris 55 Maunder minimum 55 magnetic substorms 55 Martian terrain 55 atmospheric aerosols 55 intrinsic brightness 55 moonlets 55 stellar occultations 55 Epsilon Eridani 55 planetary alignments 55 Swift Tuttle 55 Linda Spilker Cassini 55 coronal holes 55 Upsilon Andromedae b 55 auroral activity 55 whiz harmlessly 54 SN#A 54 planetary Transits 54 Antarctic Dry Valleys 54 CMB radiation 54 Oort cloud 54 interstellar particles 54 Martians invading 54 graphite whiskers 54 Saturn Cassini 54 planets orbits 54 Solar flares 54 presolar grains 54 chondrules 54 cometary impacts 54 planets circling stars 54 Mandushev 54 periodic dimming 54 protoplanetary disk 54 galactic alignment 54 nucleosynthesis 54 zodiacal dust 54 carbonaceous chondrites 54 gamma rays emitted 54 comet McNaught 54 Nasa spacecraft 54 planet magnetosphere 54 Comet 9P/Tempel 1 54 P/# A2 54 Gliese #c 54 CoRoT 9b 54 Saturn magnetosphere 54 coronal mass ejections 54 gravitational tides 54 Samuel Oschin Telescope 54 outer planets 54 meteoritic material 54 Cometary 54 Oort Cloud 54 Mercury magnetosphere 54 Higgs bosons 54 comet orbit 54 dwarf spheroidal galaxies 54 occultations 54 reentry capsule 54 Jupiter moon Io 54 interstellar dust 54 Avishay Gal Yam 54 Aurigid 54 Type Ia supernovas 54 comets 54 Alfven waves 54 interstellar cloud 54 supernovae explosions 54 moon Mab 54 ejecta 54 spinning neutron stars 54 plasmasphere 54 radioactive nuclei 54 SN #A 54 abiogenesis 54 lunar dust 54 planets moons 54 meteoroids 54 IntergalaticEarth 54 lunar crust 54 Anthony Remijan 53 volcanic moon Io 53 gravitational interactions 53 Uranus Neptune 53 Earthlike planet 53 planemos 53 Saturn rings 53 Orionids 53 albedo reflectivity 53 Gerard Kuiper 53 hypernova 53 WASP #b 53 planet Gliese #g 53 lunar soil 53 ionised gas 53 Ordovician extinction 53 transiting exoplanet 53 spicules 53 X ray binaries 53 exo planets 53 assumed planets circling 53 moon Io 53 explosive volcanism 53 cosmic phenomena 53 Comet Halley 53 aurorae 53 chlorine monoxide 53 electrons positrons 53 volcanic lava flows 53 sized planets orbiting 53 Earthlike planets 53 planetary embryos 53 gamma ray flashes 53 gravitational interaction 53 lunar regolith 53 GLAST telescope 53 photochemical reactions 53 Martian rocks 53 spacecraft thrusters 53 Manned missions 53 Martian craters 53 Epimetheus 53 sunlike stars 53 radial velocity technique 53 substorm 53 Mate Adamkovics 53 Jupiter gravitational pull 53 Bug Nebula 53 moon gravitational pull 53 van Arkel discovery 53 TrES 4 53 radioactive decay 53 comets meteors 53 chondritic meteorites 53 coronal heating 53 sterile neutrino 53 planetary nebulae 53 Cosmic rays 53 lunar perigee 53 Saturnian 53 stellar seismology 53 Particle acceleration 53 Henize #-# 53 Ultraviolet Imaging Spectrograph UVIS 53 magnetic reconnection 53 Comet Tempel Tuttle 53 celestial phenomena 53 spiral nebulae 53 Comet Encke 53 atmospheric circulations 53 NASA satellites orbiting 53 Earth ionosphere 52 Rosetta lander 52 molten magma 52 GJ #b [002] 52 silicon monoxide 52 Phaethon 52 supersymmetric particles 52 Hubble orbits 52 X ray pulses 52 KT extinction 52 Planetary nebulae 52 dynamical processes 52 ionized particles 52 Saturn Enceladus 52 phyllosilicates 52 cometary debris 52 gaseous planets 52 moon Enceladus 52 infalling gas 52 planets atmospheres 52 proplyds 52 dinosaur extinction 52 Banerdt 52 ionise 52 Geminga 52 planetary nebulas 52 Hadean 52 subsurface ocean 52 dynamical evolution 52 planets Uranus 52 Diviner instrument 52 comet 52 prebiotic molecules 52 Kuiper belt 52 magnetic monopoles 52 polar craters 52 Saturn moon 52 exoplanets orbiting 52 micro meteorites 52 cometary 52 Yarkovsky effect 52 cosmic ray intensity 52 Milankovitch 52 Voyager spacecraft 52 cosmic collisions 52 lunar magma 52 gravitational tugs 52 atmospheric disturbances 52 Fomalhaut b 52 prominences 52 Hot Jupiters 52 interstellar medium 52 particle colliders 52 elongated orbits 52 matter antimatter asymmetry 52 Saturn auroras 52 Milankovitch cycles 52 MG J# +# 52 moons circling 52 SN #gy 52 impactors 52 outer corona 52 IRC +# 52 Meteor showers 52 dust enshrouded 52 Composite Infrared Spectrometer 52 dusty disks 52 photosphere 52 binary asteroid 52 Neutron stars 52 Higgs singlet 52 starquakes 52 Saturn moons 52 accretion disks 52 Type 1a supernova 52 Plate tectonics 52 orbiting gamma ray 52 Type Ia supernova 52 Coronal mass 52 clumpiness 52 Titan smoggy 52 gaseous planet 52 Permian extinction 52 Ian McShane Pillars 52 gravitational perturbations 52 neutralinos 52 Brigham Grette 52 lunar craters 52 KT boundary 52 micrometre sized 52 layered outcrops 52 Scientists theorize 52 Maria Zuber 52 galactic magnetic 52 circular orbits 52 hydroxyl molecules 52 WISE spacecraft 52 energetic cosmic rays 52 galactic mergers 52 SIRTF 52 CMEs 52 Cassini flybys 52 Sibeck 52 Noachian era 52 Deep Impact comet 52 ferric oxides 52 airbursts 51 gamma ray bursts GRBs 51 Vourlidas 51 BP Psc 51 protoplanetary 51 Murchison meteorite 51 primitive meteorites 51 Saturn aurora 51 helium nuclei 51 biosignatures 51 airglow 51 buckypaper virtually 51 Tempel Tuttle 51 comet particles 51 smallest exoplanet 51 NASA Voyager spacecraft 51 stellar nurseries 51 filamentary structures 51 magnetospheres 51 comet tail 51 largest moon Charon 51 sulphate aerosols 51 habitable planets 51 panspermia 51 infall 51 afterglows 51 QQ# 51 Cosmic ray 51 Snowball Earth 51 carbon cenospheres 51 Fermi telescope 51 gravitational microlensing 51 Neptune Uranus 51 synchronous orbit 51 SIOUX CENTER Iowa KTIV 51 APXS 51 geostationary orbits 51 gravitational pulls 51 type Ia supernova 51 Kepler 9c 51 exoplanets planets outside 51 polar vortex 51 Orionid 51 Mössbauer 51 interplanetary spacecraft 51 gravitational lenses 51 cosmological distances 51 planets orbiting sun 51 #P/Churyumov-Gerasimenko 51 shadowy craters 51 tidally 51 cometary material 51 cryovolcanism 51 stony meteorites 51 cosmic ray 51 Martian rovers 51 Cabeus crater 51 NASA Kepler telescope 51 magnetic dynamo 51 cenospheres 51 Toutatis 51 coronal mass ejection 51 sunlike star 51 megacryometeor 51 galactic disk 51 Dust devils 51 multi celled 51 Mars landers 51 cosmic ray particles 51 cosmic strings 51 reionization epoch 51 isotopic ratios 51 discover Fomalhaut 51 permanently shadowed regions 51 blue supergiant 51 AB Aurigae 51 smoggy atmosphere 51 martian 51 rotating neutron stars 51 Magellanic Stream 51 quantum particle 51 antineutrinos 51 magnetospheric 51 cosmic microwave radiation 51 planetary atmospheres 51 astrophysical objects 51 gravitational wobbles 51 inner Oort Cloud 51 poleward shift 51 terrestrial planets 51 blackholes 51 Libra constellation Vogt 51 RHESSI 51 WISE telescope 51 protoplanetary disks 51 lensing galaxy 51 GJ#b 51 cosmological theories 51 spectral measurements 50 Nibiru 50 Michael Flasar 50 Yellowstone supervolcano 50 terraforming Mars 50 spheroidal 50 Jupiter Uranus 50 meteoritic 50 elliptical orbits 50 brightest meteors 50 KBOs 50 Earth biosphere 50 AGNs 50 X ray wavelengths 50 exoplanetary 50 Coronal Mass Ejections 50 electromagnetic flux 50 lunar equator 50 spherules 50 Jedicke 50 Charon Pluto 50 Moisture laden 50 luminous galaxies 50 kaons 50 HM Cancri 50 planetary transits 50 ultraviolet sunlight 50 Muons 50 climate forcings 50 Doppler shifts 50 NASA THEMIS 50 shadowed craters 50 cosmic cannibal 50 planets orbiting distant 50 auroral 50 isotope fractionation 50 protostars 50 electrons protons 50 YORP effect 50 homochirality 50 planetesimal 50 outermost ring 50 moondust 50 filamentary 50 comet nucleus 50 Gamma rays 50 Uranus Jupiter 50 Warmer oceans 50 planetary surfaces 50 hunting Kepler telescope 50 terraformed 50 noctilucent clouds 50 Earth asteroids NEAs 50 mysterious uncharted 50 sterile neutrinos 50 magnetosphere 50 Wolf Rayet star 50 V# Sgr 50 helium atoms 50 equatorial latitudes 50 Squyres Cornell 50 micrometeoroids 50 Saturnian system 50 neighboring Andromeda galaxy 50 faraway planets 50 spaceweather.com 50 cyanogen poisonous gas 50 millisecond pulsars 50 pre biotic 50 Coronal Mass Ejections CMEs 50 hypervelocity stars 50 Grillmair 50 Gamma ray bursts 50 Shackleton crater 50 geomagnetic substorms 50 ionospheric disturbances 50 lava tubes 50 galactic cores 50 silicate grains 50 circumstellar disk 50 binary asteroids 50 twin Voyager spacecraft 50 Elliptical galaxies 50 Earth magnetotail 50 Paleocene Eocene Thermal Maximum 50 Huygens descent 50 Giovanni Cassini 50 eccentric orbits 50 lunar highlands 50 Ulysses spacecraft 50 single celled algae 50 Lunine 50 Quadrantid 50 emits X rays 50 silicate rocks 50 protoplanetary discs 50 basaltic lava 50 Earthlike 50 Martian meteorites 50 Rossby waves 50 supermassive 50 ionized gases 50 TGFs 50 comet nuclei 50 Gusev crater 50 Peony nebula star 50 Rayleigh scattering 50 gravitational radiation 50 evaporite deposits 50 OGLE TR #b 50 planetoids 50 Mars Squyres 50 planets orbiting stars 50 Gamma ray 50 Martian equator 50 Halley comet 50 proto planetary 50 orbited Jupiter 50 interstellar dust samples 50 Cancri e 50 crustal thickness 50 supercontinents 50 Jupiter Ganymede 50 circumstellar dust 50 Epsilon Aurigae 50 Shoemaker Levy 50 ionized atoms 50 millisecond pulsar 50 lowermost mantle 50 superfluids 50 type Ia supernovae 50 spectroscopically 50 extrasolar worlds 50 Kepler #b 50 Tunguska Siberia 50 antiprotons 50 martian meteorites 50 Galilean moons 50 RPWS 49 crystalline silicates 49 Doppler measurements 49 Io volcanoes 49 silicate dust 49 retroreflector 49 Fermi Telescope 49 Methone 49 emit X rays 49 tidal bulge 49 exoplanets planets 49 Hellas Basin 49 MARSIS radar 49 meridional flow 49 downwelling 49 Perseus Cluster 49 martian rocks 49 Cosmic Microwave Background CMB 49 Bose Einstein condensates 49 comet dust 49 HL Tau 49 NASA Wilkinson Microwave 49 Konacki 49 mantle convection 49 jarosite 49 polar mesospheric clouds 49 Supernova #A 49 Gliese #G 49 Nasa Kepler 49 gamma ray emission 49 carbonaceous chondrite 49 stellar occultation 49 muons 49 flood basalts 49 Bernhard Fleck 49 planet WASP #b 49 interstellar 49 Hawking radiation 49 RRATs 49 ultracold atoms 49 Holocene epoch 49 Lander robotic arm 49 Gaensler 49 submillimeter galaxies 49 methane burps 49 Hipparcos 49 Eta Carinae 49 olivine rich 49 Wilkinson Microwave Anisotropy Probe 49 Carina constellation 49 clathrates 49 paleomagnetic 49 smoothest flattest 49 electron neutrinos 49 planetary magnetospheres 49 moon Europa 49 hematite mineral 49 Sagittarius dwarf galaxy 49 interstellar grains 49 NEAs 49 comet flyby 49 spicule 49 waning gibbous 49 colliding asteroids 49 relativistic particles 49 Jupiter magnetosphere 49 strangelets 49 gravitational waves 49 ultraviolet radiation emitted 49 Jenniskens 49 dustier stormier atmosphere 49 CoRoT satellite 49 Cryogenian 49 basaltic rocks 49 Mewaldt 49 Atlantic Multidecadal Oscillation AMO 49 Super Earths 49 GJ #b [001] 49 Heliospheric Observatory SOHO 49 planetary astronomer 49 orbiting Saturn 49 hydrothermal activity 49 habitable worlds 49 Helix Nebula 49 Venusian atmosphere 49 ejecta blanket 49 backscattered 49 HIP #b 49 astrobiological 49 radiometric measurements 49 NASA Far Ultraviolet 49 greatest insect emergences 49 seafloors 49 explosive eruptions 49 Sasselov 49 Magnetars 49 Churyumov Gerasimenko 49 electron neutrino 49 ionized hydrogen 49 overlying layers 49 atmospheric oceanic 49 noctilucent 49 Io Europa 49 Eta Aquarids 49 Saturn Uranus 49 mesospheric 49 dwarf galaxies 49 Magnetic reconnection 49 Saturnian moon 49 superluminal 49 Eemian 49 muon neutrino 49 geomagnetic storms 49 galaxy redshift 49 tectonic plate movements 49 moons Phobos 49 geomagnetic activity 49 proton proton collisions 49 X ray emission 49 SPICAM 49 Spudis 49 Galileo spacecraft 49 Seyfert galaxies 49 chondritic 49 moons 49 Corot 9b 49 mineralogical composition 49 Mars Pathfinder lander 49 Arik Posner 49 waxing crescent 49 Earth magnetosphere 49 galactic collisions 49 Solar TErrestrial RElations Observatory 49 Saturnian moon Titan 49 extrasolar planetary systems 49 geoneutrinos 49 starbursts 49 yardangs 49 microphysical 49 brightest supernova 49 anomalously warm 49 inner moons 49 orbiting observatories 49 Sara Seager 49 choking irritants 49 isostatic rebound 49 Mini TES 49 magnetic polarity 49 planet Nibiru 49 Emily Lakdawalla 49 volcanic plumes 49 constellation Eridanus 49 merging galaxies 49 oceanic circulation 49 GQ Lupi 48 Globular clusters 48 Stardust NExT 48 diamagnetic 48 rotational axis 48 crustal movements 48 glacial interglacial 48 weakly interacting 48 zodiacal light 48 hydrated minerals 48 organic molecules 48 dust particles 48 Hale Bopp 48 Cygnus Lyra region 48 Type 1a supernovae 48 Martian volcanoes 48 hydrogen isotopes 48 harmonic tremors 48 UV photons 48 planets 48 stony meteorite 48 Invisibility cloak 48 neutrino particles 48 galaxy formation 48 Earth orbiting satellites 48 magnetopause 48 Jupiter moons 48 Martian microbes exist 48 subatomic particle 48 Slime molds 48 Sromovsky 48 solar flares 48 Elemental mercury 48 Kuiper Belt Object 48 Voyager probes 48 rubidium vapor 48 bolide 48 gamma rays X rays 48 orbital eccentricity 48 Mars moon Phobos 48 ionised 48 Muchachos Observatory 48 Martian polar 48 Reiner Gamma 48 Orion nebula 48 highly magnetized neutron 48 synchrotron x ray 48 magma molten rock 48 Saturn innermost 48 Red Rectangle 48 silicates 48 HiRISE camera aboard 48 Ray Spectrometer 48 WMAP satellite 48 Dimitar Sasselov 48 asteroid 48 Polycyclic aromatic hydrocarbons 48 Saturn Jupiter Uranus 48 Terraforming 48 interstellar space 48 heavily cratered 48 Bok globules 48 Cryogenian period 48 spatially resolved 48 detect gravitational waves 48 asteroids 48 ultraviolet imaging spectrograph 48 gravitationally 48 sundog 48 Big Bang Machine 48 planetary nebula 48 excavated crater 48 spherically symmetric 48 tectonic movements 48 lunar landers 48 X rays gamma rays 48 volcanic eruptions 48 HD #b [001] 48 hydrothermal fluid 48 Douglas Hudgins Kepler 48 Ringed Planet 48 asteroseismology 48 NASA Stardust spacecraft 48 magnetic fields 48 perchlorate salts 48 lobate scarps 48 auroral emissions 48 galactic halo 48 isotopic composition 48 proto galaxies 48 Milky Way halo 48 SN #D 48 Martian lander 48 quark gluon plasma 48 starburst galaxy 48 earthlike planets 48 aerosol particles 48 Franck Marchis 48 volcanism 48 tungsten isotopes 48 Jupiter flyby 48 noble gases 48 Computer simulations 48 cinder cones 48 planets constellations 48 steam eruptions 48 rocky planets 48 Descent Imager Spectral Radiometer 48 inhaled fibers 48 MIT planetary scientist 48 magnetic monopole 48 Perseid shower 48 EPOCh 48 interstellar dust particles 48 Ultraviolet rays 48 biosignature 48 underwater volcanoes 48 Planck satellite 48 twin STEREO spacecraft 48 superstrings 48 Virgo Cluster 48 sun corona 48 metallicity 48 cratons 48 auroral displays 48 orbiting planets 48 Adam Riess 48 Meridiani 48 Magnetospheric 48 Comet Hartley 2 48 femtosecond timescale 48 G#.# +#.# 48 Jovian moons 48 Triangulum 48 impactor 48 Dwarf galaxies 48 chlorine peroxide 48 astrophysical phenomena 48 sedimentary layers 48 substorms 48 supervolcanoes 48 stratospheric clouds 48 barred owls migrated 48 Coma Cluster 48 Pacific Decadal Oscillation PDO 48 Saturn moon Enceladus 48 Bottke 48 inhomogeneities 48 Antennae Galaxies 48 orbital resonance 48 Viking landers 48 synchrotron emission 48 polygon patterns 48 cosmic rays 48 occulted 48 uncharged particles 48 isotopic signature 48 Comet Hartley 48 equatorial bulge 48 astronomical phenomena 48 NASA twin rovers 48 supernovae 48 Stardust NExT mission 48 Arctic oscillation 48 extrasolar planets orbiting 48 Galilean satellites 48 Perseid meteors 48 Orientale Basin 48 spherical halo 48 VHE gamma rays 48 SMBHs 48 magma chambers 48 innermost planet 48 astronomer Percival Lowell 48 post perovskite 48 ultrashort pulses 48 eclipsing binaries 48 oscillations 48 magnetar 48 Quadrantid meteor shower 48 red supergiants 48 phyllosilicate 48 hot Jupiters 48 orbiters landers 48 gamma ray flares 48 dwarf galaxy 48 spaceborne 48 photosynthetic organisms 48 CoRoT 7b 48 quantum oscillations 48 Kamoamoa eruption 48 Martian meteorite 48 pliosaur ferocious predator 48 cosmic gamma rays 48 prograde 48 forams 48 Peter Jenniskens 47 erupting lava 47 nebulae 47 interstellar dust tiny 47 planetary geologists 47 globulars 47 Wilkinson Microwave Probe 47 Extrasolar planets 47 solar minima 47 oblate spheroid 47 orbiting telescope 47 PSR B# +# 47 Mott insulators 47 Nikku Madhusudhan 47 journal Meteoritics 47 Martian gullies 47 Mayan prophecies 47 Charles Beichman 47 auroras 47 spectral fingerprints 47 X ray observatories 47 mu Arae 47 protons collide 47 Syrtis Major 47 Einstein relativity theory 47 particle acceleration 47 extraterrestrial UFOs 47 Isidis Planitia 47 Mössbauer spectrometer 47 Robin Canup 47 inner asteroid belt 47 permanently shadowed 47 Bonnie Buratti 47 Valles Marineris 47 ESA Planck 47 planet Uranus 47 Mercury Uranus 47 warmer wetter 47 Orionid meteors 47 protostar 47 coccolithophores 47 ionized gas 47 spontaneous fission 47 WISE infrared 47 quasars 47 cosmic ray collisions 47 IBEX spacecraft 47 Regolith 47 earthshine 47 cirrus cloud 47 midlatitudes 47 Radiometric dating 47 submillimeter 47 sulfate aerosol 47 ecliptic plane 47 Uranus 47 Ice Ages