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(Click for frequent words.) 91 Comet Swift 66 comet Tempel Tuttle 64 cometary debris 62 Swift Tuttle 60 Comet Tempel Tuttle 56 Tempel Tuttle 53 comet 53 meteoroids 53 Hyakutake 53 comets orbiting 52 Halley Comet 52 Meteor showers 51 comets 50 Comet #P 50 comets moons 50 Kuiper belt object 49 planets comets 49 Phaethon 49 comet McNaught 49 comet dust 49 Fermi telescope 49 Saturn magnetosphere 49 volcanic moon Io 49 nebulae 49 cosmological distances 49 Orionids 49 Pleiades star 49 Ringed Planet 48 Saturn Enceladus 48 Halley comet 48 micrometeoroids 48 interstellar dust 48 asteroids comets 48 collisional 48 planets orbits 48 Lyrids 48 planet transits 48 interstellar dust clouds 48 HD#b 48 Kuiper Belt Objects 48 Jupiter magnetosphere 48 cometary dust 48 Ring Nebula 48 magnetosphere 48 magnetotail 47 jovian 47 Comet Halley 47 periodic dimming 47 interstellar particles 47 filamentary structure 47 moon Ganymede 47 umbral shadow 47 olivine mineral 47 Quadrantids 47 protoplanets 47 comet tail 47 Comet Lulin 47 tiny meteoroids 47 cometary 47 constellation Carina 47 astronomical objects 47 galactic disk 46 ejecta 46 Earth magnetotail 46 submillimeter galaxies 46 comets asteroids 46 Oort cloud 46 moonlet 46 supernova explosions 46 Comet Holmes 46 Dumbbell Nebula 46 permanently shadowed craters 46 coronal loop 46 icy comets 46 stellar occultations 46 cosmic rays 46 Comet Hartley 2 46 meteor showers 46 Upsilon Andromedae 46 distant quasars 46 Orionid 46 P/# A2 46 hydrothermal explosions 46 Gravitational waves 46 penumbral shadow 45 meteoroid 45 gaseous planet 45 photosphere 45 interstellar cloud 45 Corot 9b 45 Jupiter moon Io 45 planetary astronomer 45 WISE spacecraft 45 foreground galaxy 45 exo planets 45 Leonid meteor 45 brightest meteors 45 star Beta Pictoris 45 #gy 45 Perseid shower 45 aphelion 45 retrograde orbit 45 retrograde orbits 45 galactic halo 45 Hale Bopp 45 infalling 45 magnetite crystals 45 lensing galaxy 45 constellation Ursa Major 45 Neptune Uranus 45 gravitational interaction 45 Virgo Cluster 45 Digitized Sky Survey 45 silicon monoxide 45 tholins 45 ecliptic plane 45 Methone 45 Quadrantid meteor shower 45 Galactic cosmic rays 45 Perseids 45 Deep Impact eXtended Investigation 45 ejecta blanket 45 Perseid meteor shower 45 #P/Churyumov-Gerasimenko 45 solar corona 45 MG J# +# 45 Orionid meteor shower 45 Oort Cloud 45 #P/Holmes 45 dwarf galaxy 45 Comet Hale Bopp 45 oppositely directed 44 Comet Hartley 44 exosphere 44 constellation Andromeda 44 constellation Taurus 44 Solar eclipses 44 silicate dust 44 microscopic specks 44 VY Canis Majoris 44 Kuiper belt 44 Valles Marineris 44 constellation Perseus 44 backscattered 44 Saturn moons Enceladus 44 solar prominences 44 Manned missions 44 interstellar dust grains 44 interstellar dust particles 44 circumstellar disk 44 orbits Saturn 44 intrinsic brightness 44 accretion disks 44 GQ Lupi 44 Coma Cluster 44 energetic electrons 44 thrilling stargazers 44 sundog 44 CoRoT #b 44 Cattle wandered 44 cometary material 44 CMB radiation 44 Smithsonian astronomer 44 orbiting planets 44 hematite mineral 44 galaxy M# [001] 44 Cometary 44 mineral olivine 44 constellation Sagittarius 44 Taurids 44 noctilucent clouds 44 Geminid 44 circumstellar disks 44 Earthly contamination 44 orbited Jupiter 44 Saturn rings 44 circumstellar 44 star Spica 44 X ray wavelengths 44 reflection nebula 44 frequency combs 44 protoplanetary disks 44 Comet 9P/Tempel 1 44 X ray emission 44 perihelion 44 waxing crescent 44 AGNs 44 NEAs 44 waning gibbous 44 transiting planet 44 Leonids 44 Astrological lore 44 Comet McNaught 44 Saturnian moons 44 interstellar medium 44 meteorites 44 twin Voyager spacecraft 44 Cosmic rays 44 Perseid meteors 44 interstellar clouds 44 Perseid meteor 44 planet orbits 44 comet nucleus 43 interstellar space 43 AU Mic 43 sofa cushions protected 43 coronal loops 43 Syrtis Major 43 occultations 43 constellation Aquila 43 planet HD #b 43 elliptical orbits 43 McDonald Aeberli Funeral Home 43 Phoebe orbits 43 Coma cluster 43 asteroids orbiting 43 occulted 43 bolide 43 Earth magnetosphere 43 pallasite meteorite 43 Gemini constellation 43 Bug Nebula 43 comet Churyumov Gerasimenko 43 Fomalhaut b 43 orbits 43 Deep Impact flyby spacecraft 43 OGLE TR #b 43 Aurigid 43 spacecraft flyby 43 comet nuclei 43 GRBs 43 EPOXI spacecraft 43 constellation Virgo 43 cosmic ray 43 meridional flow 43 magnetospheric 43 Ulysses spacecraft 43 fainter objects 43 planets Uranus 43 moon Charon 43 Nasa spacecraft 43 Leonid meteors 43 dirty snowballs 43 HiRISE image 43 gamma rays emitted 43 Hubble orbits 43 planets asteroids 43 constellation Aquarius 43 supervolcanoes 43 Saturn moon Enceladus 43 moon Phobos 43 Gamma ray bursts 43 vortices 43 Epsilon Aurigae 43 Comet Encke 43 Dust devils 43 highly elliptical orbits 43 Geminids 43 starburst galaxy 43 zodiacal light 43 Mojzsis 43 galaxy NGC 43 Cancri e 43 transiting exoplanet 43 planets moons 43 dust devils 43 Uranus Neptune 43 icy moons 43 Saturnian moon 43 Cosmic ray 43 gamma ray observatory 43 aurorae 43 Mars Uranus 43 visible wavelengths 43 eccentric orbits 43 cirrus clouds 43 radial velocity 43 polar craters 43 sized planets orbiting 43 moon Mimas 43 Solar TErrestrial RElations Observatory 43 solar nebula 43 asteroidal 43 Upsilon Andromedae b 43 galactic cosmic rays 43 Comet Machholz 43 Saturn moon Mimas 43 Saturn outermost moon 42 star Fomalhaut 42 Geminga 42 constellation Gemini 42 Io volcanoes 42 hydroxyl molecules 42 SIRTF 42 lunar crust 42 GJ#b 42 COROT 7b 42 ionized gas 42 Lander robotic arm 42 protoplanet 42 supernova explosion 42 Evolution Explorer 42 slender crescent 42 GALEX 42 impactors 42 diffuse aurora 42 infall 42 interplanetary dust 42 Uranus Jupiter 42 Galilean satellites 42 buckypaper virtually 42 gravitational keyhole 42 KBOs 42 comet particles 42 coronal mass ejections CMEs 42 metallicity 42 relativistic particles 42 BLG #Lb 42 Red Rectangle 42 millisecond pulsar 42 WMAP satellite 42 asteroid belt 42 extrasolar 42 galaxy M# [002] 42 PSR J# 42 globulars 42 constellation Leo 42 V# Mon 42 celestial sphere 42 Great Orion Nebula 42 shepherding spacecraft 42 RS Ophiuchi 42 inner Oort Cloud 42 swirling dust devils 42 moon Io 42 merging galaxies 42 magnetic polarity 42 Galileo spacecraft 42 tektites 42 airglow 42 polarimetry 42 asteroids 42 nebulas 42 silicate mantle 42 Comet Shoemaker Levy 42 Diviner instrument 42 interferogram 42 planet magnetosphere 42 Corot 7b 42 innermost planet 42 supernovae explosions 42 Spitzer infrared telescope 42 constellation Lyra 42 olivine crystals 42 proplyds 42 accretion disk 42 sulfate salts 42 cosmic cannibal 42 subsurface ocean 42 primitive meteorites 42 exoplanets planets 42 gaseous planets 42 NASA EPOXI mission 42 WASP #b 42 highly elliptical orbit 42 galaxies collide 42 primordial ingredients 42 Cassini flyby 42 cinder cones 42 lunar equator 42 proto planetary disk 42 Geminid shower 42 Neptune Uranus Jupiter 42 RHESSI 42 distant galaxies 42 Toutatis 42 terrestrial globes 42 Funnel cloud 42 heavily cratered 42 meteoroid impacts 41 Swift Ultraviolet Optical 41 moons orbiting 41 northern arctic plains 41 Martian craters 41 quasars 41 Leonid meteor shower 41 Anisotropy Probe WMAP 41 N. Rathnasree 41 planetary nebulas 41 periodicities 41 comets meteors 41 carbonate minerals 41 planetary surfaces 41 pyroclastic flow 41 water vapor 41 Thermal Emission Spectrometer 41 Type Ia supernovas 41 circular orbits 41 GJ #b [002] 41 Zeta Ophiuchi 41 astronomer Clyde Tombaugh 41 spherules 41 Gamma ray burst 41 largest moon Charon 41 femtosecond timescale 41 moonlets 41 trans Neptunian objects 41 journal Icarus 41 Total lunar eclipses 41 sunlike star 41 Milky Way Galaxy 41 atmospheric disturbances 41 interstellar dust samples 41 X ray pulses 41 substorms 41 infrared radiation 41 planetary Transits 41 spectral fingerprints 41 protoplanetary 41 Samuel Oschin Telescope 41 chondritic meteorites 41 Coronal mass 41 tidal bulge 41 silicate rocks 41 planetesimals 41 Noctilucent clouds 41 HiRISE camera aboard 41 Spacewatch 41 gravitational waves 41 NASA Voyager spacecraft 41 lava flows 41 brightest comet 41 prolific Key Tuffite 41 Herbig Ae Be 41 Solar System 41 Neutron stars 41 Ranging spacecraft 41 Laser Interferometer Gravitational Wave 41 Fomalhaut 41 cosmic microwave background 41 spectroscopic analysis 41 meteor impacts 41 gamma ray burst 41 dust particles 41 pulsar 41 X ray afterglow 41 Ranging MESSENGER spacecraft 41 yardangs 41 interacting galaxies 41 jarosite 41 gravitational microlensing 41 quasar 41 afterglows 41 celestial object 41 flood basalts 41 Muons 41 comet Shoemaker Levy 41 galactic cores 41 moon permanently shadowed 41 Epsilon Eridani 41 Lagoon Nebula 41 extrasolar planets 41 Io Europa Ganymede 41 G#.# +#.# 41 Saturn equinox 41 constellation Centaurus 41 Sagittarius dwarf galaxy 41 axions 41 asteroid Itokawa 41 tidal tails 41 planetary magnetospheres 41 Gusev crater 41 meteor shower 41 GRB# 40 retroreflector 40 polar stratospheric 40 stellar occultation 40 Geminid meteor shower 40 Martian dust 40 NASA Cassini 40 quantum mechanically 40 Spitzer infrared spectrograph 40 neutron star 40 SWIFT J#.# 40 phyllosilicates 40 asteroid Steins 40 infrared wavelengths 40 X ray observatories 40 debris 40 Type Ia 40 NASA Wilkinson Microwave 40 gamma ray observatories 40 filamentary structures 40 Cassini flybys 40 gravitational lens 40 intracluster 40 inhabitable planets 40 gamma ray bursts 40 constellation Vulpecula 40 Jovian atmosphere 40 Astronomical Units 40 Infrared Pathfinder Satellite 40 exoplanetary 40 KH #D 40 galactic collisions 40 WISE infrared 40 ionized gases 40 baryon 40 Heliospheric Observatory SOHO 40 magnetospheres 40 Mars Saturn Uranus 40 tornadic thunderstorms 40 asteroid Eros 40 HD #b [001] 40 meteors 40 supernova remnant 40 lunar craters 40 HiRISE images 40 shadowed craters 40 meteor 40 neutral mass spectrometer 40 YORP effect 40 Doppler measurements 40 spaceweather.com 40 astrophysical objects 40 globular star 40 gravity warps 40 Hyper spectral 40 terrestrial planets 40 moon Mab 40 galactic bulge 40 macroscopic objects 40 Hanny Voorwerp 40 comet Lulin 40 faint meteors 40 starlight 40 Jovian moons 40 mesosphere 40 mu Arae 40 exo planet 40 Saturnian system 40 fainter meteors 40 Andromeda galaxy 40 Eta Aquarids 40 planet Gliese #g 40 asteroid 40 Nasa Mars Reconnaissance 40 waxing gibbous moon 40 Shoemaker Levy 40 THEMIS Image 40 HD #b [002] 40 meteor sightings 40 sunlike stars 40 gustnado 40 meteoritic material 40 Iapetus 40 outer corona 40 magnetic fields 40 Kuiper belt objects 40 Kuiper Belt 40 Distant galaxies 40 substorm 40 KT boundary 40 distant supernovas 40 barred spiral galaxy 40 extrasolar planetary systems 40 spatially resolved 40 McAlester Muskogee 40 crystalline silicates 40 Microlensing 40 Orionid meteors 40 zodiacal constellations 40 occultation 40 pallasite 40 gamma ray flashes 40 APXS 40 starbursts 40 Saturn Cassini 40 Beta Pictoris b 40 Hot Jupiters 40 Canis Minor 40 neutrino 40 concretions 40 Gerard Kuiper 40 icy moon Enceladus 40 Asteroid Belt 40 Epoxi 40 planets 40 look distractingly cartoony 40 UA Lunar 40 Geminid meteors 40 asteroid collisions 40 Trojan asteroids 40 relativistic jets 40 zodiacal constellation 40 pyroxene 40 celestial bodies 40 komatiites 40 planetary embryos 40 spacecraft Cassini 40 antiparticle 40 Carnegie Observatories 40 Compact Reconnaissance Imaging Spectrometer 40 dinosaur extinction 40 extragalactic 40 stony meteorites 40 meteor crater 40 orbiting 40 Elenin 40 Trifid Nebula 40 presolar grains 40 carbonaceous chondrites 40 impactor spacecraft 40 GRB #B 40 Stardust spacecraft 40 Martian rocks 40 Cassini ion 40 NASA Cassini spacecraft 40 lunar perigee 40 giant elliptical galaxy 40 Pancam 40 heliosheath 40 shadowy craters 40 Pluto dwarf 40 Jupiter icy moons 40 interplanetary spacecraft 39 supernova remnants 39 permanently shadowed regions 39 Mount Stromlo Observatory 39 Fermi Gamma ray 39 ultraviolet wavelengths 39 raining ash 39 Comet #P/Churyumov-Gerasimenko 39 Helix Nebula 39 earthshine 39 galaxy redshift 39 galactic alignment 39 spacetime 39 planemos 39 protoplanetary disk 39 dimming starlight 39 Damaging hail 39 Globular clusters 39 gamma ray flares 39 Nikku Madhusudhan 39 gravitational tides 39 Nubian Desert 39 cenospheres 39 alpha particles 39 STEREO mission 39 heliopause 39 Substorms 39 Earth orbiting satellites 39 Earthlike planets 39 constellation Ophiuchus 39 orbiting observatories 39 comet flyby 39 Trifid 39 coronal holes 39 constellation Eridanus 39 Deep Impact probe 39 mineral hematite 39 Cosmic Microwave Background 39 ESO PR 39 Wilkinson Microwave Anisotropy Probe 39 planets circling stars 39 Pluto Charon 39 micrometeorite impacts 39 exoplanets orbiting 39 Maunder minimum 39 coronal mass ejection 39 moon Enceladus 39 supermassive black hole 39 NASA Stardust spacecraft 39 Milky Way halo 39 Sojourner rover 39 telescopes 39 comet orbit 39 magnetic excitations 39 Quaoar 39 Caloris 39 particles 39 nebular 39 outer planets 39 Meridiani 39 inner moons 39 nebula 39 gibbous moon 39 Space Environment Geochemistry 39 distant supernovae 39 Kepler 9c 39 Triangulum Galaxy 39 X ray telescopes 39 moons Phobos 39 Quadrantid 39 Avishay Gal Yam 39 HL Tau 39 Galilean moons 39 quartz carbonate veining 39 Washita counties 39 THEMIS satellites 39 colliding asteroids 39 gravitationally bound 39 EPOCh 39 gamma ray bursts GRBs 39 Mercury magnetosphere 39 Io Europa 39 lunar soil 39 Cygnus Lyra region 39 planetary nebula 39 Mars Surveyor 39 moons Europa 39 subatomic particles 39 assumed planets circling 39 planet WASP #b 39 carbonaceous chondrite 39 Magellanic Stream 39 kaons 39 meteorite impacts 39 Imke de 39 elliptical galaxy 39 galactic cosmic ray 39 supergiant star 39 ringed planet 39 Enceladus 39 infrared wavelength 39 scatterometer 39 Orion constellation 39 galactic mergers 39 slender crescent moon 39 Deep Impact craft 39 hydrosphere 39 van Arkel discovery 39 TGFs 39 UVIS 39 Charon Pluto 39 coronal mass ejections 39 Suzaku X ray 39 dynamical evolution 39 HIP #b 39 Supernovae 39 Crab Nebula 39 Earth radii 39 constellation Cassiopeia 39 magnetic reconnection 39 phyllosilicate 39 binary asteroid 39 ionosphere 39 NEAR Shoemaker 39 insoluble plaque 39 Meteorites 39 ray Space Telescope 39 heliosphere 39 Earthlike planet 39 Kuiper Belt object 39 http:/www.nasa.gov/cassini 39 spectroscopic observations 39 isotopic ratios 39 Alfven waves 39 optical wavelengths 39 infrared spectra 39 Delta Cephei 39 spiral nebulae 39 wavelength infrared 39 blade jutted 39 Eagle Nebula 39 zodiac constellations 39 colliding galaxies 39 Gamma rays 39 Trained spotters 39 Planetary nebulae 39 detect gravitational waves 39 orbiting gamma ray 39 Shackleton crater 39 lava tubes 39 cosmic collisions 39 Helix nebula 39 spherically symmetric 39 drifting westward 39 active galactic nuclei 39 Cydonia region 39 prograde 39 volcanism 39 Relations Observatory STEREO 39 Diviner 39 sun corona 39 Buzzard Coulee 39 visit http:/saturn.jpl.nasa.gov 39 NEOWISE 39 Neoma 39 spacecraft orbiting 39 Stadermann 39 millisecond pulsars 39 type Ia supernovae 39 Kepler #b 39 galaxies 39 astrophysical 39 super perigee moon 39 IBEX spacecraft 39 martian rocks 39 Mission SRTM 39 carbonaceous chondrite meteorites 39 downbursts 39 luminous galaxies 38 distant quasar 38 telescopic observations 38 inner asteroid belt 38 WISE telescope 38 iridium layer 38 Astrophysical 38 polar vortex 38 Archean aged 38 Haumea 38 pea sized hail 38 proto planetary disks 38 supercell thunderstorm 38 galactic clusters 38 comet #P/Churyumov-Gerasimenko 38 eclipsing binary 38 micrometeorites 38 interstellar boundary 38 cosmic dust 38 rovers solar panels 38 Jupiter Ganymede 38 planetary transits 38 blazars 38 Otter Tail Polk 38 explosive eruptions 38 New Horizons spacecraft 38 Carina constellation 38 constellation Bootes 38 tornadic thunderstorm 38 tornadic 38 hydrated minerals 38 Hesperian epoch 38 Waterspouts 38 moondust 38 Eta Carinae 38 Earthshine 38 OMEGA instrument 38 NASA Chandra 38 constellation Cygnus 38 cometary impacts 38 electron neutrinos 38 TrES 4 38 gravitational wave 38 noble gases 38 permanently shadowed 38 galaxy cluster 38 star Proxima Centauri 38 GZK cutoff 38 constellation Auriga 38 NASA QuikScat satellite 38 Cabeus crater 38 planetary atmospheres 38 EPOXI 38 flyby Cassini 38 constellation Hercules 38 chondrite 38 brightest supernova 38 albedo reflectivity 38 supergiant stars 38 YU# 38 moon Titan 38 comet Hale Bopp 38 Carey Lisse 38 X ray Telescope XRT 38 Steins asteroid 38 comet Wild 38 Spitzer Space Telescope 38 rover Spirit landed 38 Comet Tempel 1 38 Spiral galaxies 38 micro meteorites 38 habitable planets 38 Wolf Rayet star 38 Planetary Science Institute 38 supernovae 38 Magellanic Clouds 38 THEMIS 38 faint galaxies 38 Relda 38 spectroscopic 38 Lunar Reconnaissance Orbiter LRO 38 helium atoms 38 tidally 38 molten lava rocks 38 GLAST telescope 38 interstellar grains 38 zodiacal dust 38 electrons 38 Downed tree limbs 38 Type Ia supernova 38 distant galaxy 38 SN #A 38 Dry Valleys 38 meteorologist Cristy 38 solar flares 38 snow Ergang 38 constellation Cetus 38 Taurid meteor shower 38 Earth ionosphere 38 gravitational lensing 38 microlensing events 38 reionization 38 type Ia supernova 38 Cepheids 38 meteorite 38 Volcanic eruptions 38 extrasolar planet 38 star Gliese 38 spontaneously ignite 38 moonquakes 38 globular cluster M# 38 accreting 38 LORRI 38 Leonid meteor showers 38 spiral galaxy NGC 38 optical telescopes 38 planetary nebulae 38 elongated orbits 38 hyper spectral 38 planet Uranus 38 TODAY Showers 38 stellar nurseries 38 supernova 38 asthenosphere 38 MARSIS radar 38 gamma ray emission 38 epidote alteration 38 Milky Way galaxy 38 scar tissue degenerative cysts 38 Descent Imager Spectral Radiometer 38 gamma rays 38 Ravenden 38 sodium atoms 38 sediments deposited 38 Beta Pictoris 38 Cassini imaging 38 supernovas 38 auroral activity 38 HD# [002] 38 Venusian atmosphere 38 RXTE 38 NASA Lunar Reconnaissance 38 mere fly bys 38 Martian meteorites 38 SN #C 38 Barbra Woodbury 38 ionized hydrogen 38 gravitational perturbations 38 galaxy clusters 38 Doppler shifts 38 lavas 38 missing baryons 38 chromosphere 38 active volcanism 38 NGC #A 38 exoplanet 38 cosmic strings 38 Planetary Fourier Spectrometer PFS 38 martian atmosphere 38 muons 38 rocky terrestrial planets 38 NASA rovers Spirit 38 Solar flares 38 Imaging Spectroradiometer MODIS instrument 38 neutrino particles 38 elemental composition 38 smoothest flattest spot 38 active galactic nucleus 38 subatomic particle 38 auroras 38 carbonaceous material 38 evaporite deposits 38 Voorwerp 38 Mercury flyby 38 SDSS II 38 Andromeda Galaxy 38 thrust faulting 38 Antarctic Dry Valleys 38 gamma ray photons 38 NASA MESSENGER spacecraft 38 Extrasolar Planet Observations 37 fragile thermal tiles 37 Earth asteroids NEAs 37 St. Lucia Martinique 37 antineutrinos 37 appl bacitracin dressing 37 Nasa Kepler 37 red supergiant 37 Ice Age mammals 37 astronomers 37 solar radii 37 silicates 37 martian surface 37 Hipparchus 37 Interstellar Boundary Explorer 37 Higgs bosons