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(Click for frequent words.) 76 Halley comet 70 Swift Tuttle 64 comet 62 Comet Lulin 61 Hale Bopp 61 Haley Comet 61 comet Tempel Tuttle 61 Comet Halley 60 cometary debris 59 comets 59 comet tail 59 Orionids 58 Comet McNaught 58 Quadrantids 58 Comet Hartley 2 58 Leonids 58 Toutatis 58 Phaethon 57 Taurids 57 planet Uranus 57 Orionid 56 asteroid 56 Geminids 56 perihelion 56 Comet Holmes 56 meteoroid 55 Perseids 55 Perseid shower 55 Pleiades star 55 Lyrids 55 Comet Tempel Tuttle 55 Geminid meteor shower 55 Meteor showers 55 Leonid meteor shower 54 meteor 54 meteor shower 54 Quadrantid meteor shower 54 Comet Hartley 54 constellation Perseus 54 Kuiper Belt Object 54 distant galaxy 54 Geminids meteor shower 54 brightest comet 54 Saturnian 53 Manhattanhenge 53 Ring Nebula 53 Noctilucent clouds 53 millisecond pulsar 53 noctilucent clouds 53 innermost planet 53 Orionid meteor shower 53 Epsilon Aurigae 53 Comet Hale Bopp 53 moons 53 Comet Tempel 1 53 Comet Swift 53 Perseid meteors 53 lunar perigee 53 meteoroids 53 Leonid meteor 53 Eta Aquarids 52 Nasa spacecraft 52 Geminid meteors 52 Comet Machholz 52 Eta Aquarid meteor shower 52 celestial object 52 gaseous planet 52 comet Swift 52 meteors 52 ecliptic 52 outer planets 52 Kuiper Belt object 52 Voyager spacecraft 52 Perseid meteor shower 52 Geminid 52 Tempel Tuttle 52 meteor showers 52 Lyrid meteor shower 52 comet Hale Bopp 51 waxing gibbous moon 51 Oort Cloud 51 Upsilon Andromedae 51 Aurigid 51 moon 51 Oort cloud 51 highly elliptical orbits 51 aphelion 51 comet McNaught 51 asteroid Itokawa 51 Orionid meteors 51 Perseids meteor shower 51 WASP #b 51 Kuiper Belt Objects 51 TrES 4 51 Corot 7b 51 celestial sphere 51 cometary 51 comet dust 51 constellation Taurus 51 Giovanni Cassini 51 GRB #B 50 planet transits 50 extrasolar planet 50 retrograde orbit 50 comet Lulin 50 Milky Way Galaxy 50 Saturn Cassini 50 Saturn rings 50 constellation Aquarius 50 celestial equator 50 spacecraft Cassini 50 HD #b [002] 50 Helix nebula 50 Galileo spacecraft 50 Eta Carinae 50 Meteor Shower 50 Leonid meteors 50 constellation Leo 50 Venusian 50 gibbous 50 Andromeda galaxy 50 zodiacal light 50 Pluto Charon 50 Andromeda Galaxy 50 transiting exoplanet 50 #P/Holmes 50 brightest supernova 50 transiting planet 50 HD#b 50 comet nucleus 49 RQ# 49 Perseid Meteor Shower 49 Galilean moons 49 Edmond Halley 49 Fermi telescope 49 mu Arae 49 NASA Stardust spacecraft 49 extrasolar planets 49 constellation Gemini 49 celestial phenomenon 49 Uranian 49 comets orbiting 49 Meteor shower 49 twin Voyager spacecraft 49 periodic dimming 49 supernova 49 waning gibbous moon 49 asteroids 49 elliptical orbits 49 Comet #P/Churyumov-Gerasimenko 49 dust devils 49 occultations 49 Quaoar 49 icy comets 49 supermoon 49 Lunar eclipse 49 Epsilon Eridani 49 Dumbbell Nebula 49 Leonids meteor shower 49 GQ Lupi 49 penumbral lunar eclipse 49 Orion Nebula 49 coronal mass ejection 49 X ray afterglow 49 Saturn outermost moon 49 #P/Churyumov-Gerasimenko 49 Wolf Rayet star 49 Earthlike planet 49 occultation 49 stellar occultations 48 astronomical phenomena 48 spacecraft flyby 48 Hipparchus 48 P/# A2 48 HD# [002] 48 HD #b [001] 48 MESSENGER spacecraft 48 bolide 48 GJ#b 48 sundog 48 Ulysses spacecraft 48 SN #gy 48 PSR J# 48 comet particles 48 COROT 48 Solar System 48 Bug Nebula 48 Leonid Meteor Shower 48 Nibiru 48 Hyakutake 48 planets 48 Heliospheric Observatory SOHO 48 Galaxy Evolution 48 comet Churyumov Gerasimenko 48 NASA Cassini 48 galaxy NGC 48 axions 48 GALEX 48 constellation Ursa Major 48 GJ #b [001] 48 Crab Nebula 48 interstellar particles 48 Muons 48 planets orbiting sun 48 Shoemaker Levy 48 Itokawa 48 Cassini 48 Pleiades 48 occulted 48 Lulin 48 cosmological distances 47 MN4 47 gibbous moon 47 planetoid 47 # Apophis 47 constellation Virgo 47 astronomical objects 47 Solar Dynamics Observatory 47 exoplanets orbiting 47 protoplanet 47 comets asteroids 47 planetary nebula 47 Ringed Planet 47 comet Wild 47 WD5 47 GA6 47 icy moons 47 Muchachos Observatory 47 Cassini Huygens spacecraft 47 orbited Jupiter 47 exo planets 47 Leonid shower 47 gamma ray burst 47 retrograde orbits 47 GJ #b [002] 47 planet WASP #b 47 annular eclipse 47 CoRoT 7b 47 cosmic rays 47 astronomer Clyde Tombaugh 47 celestial bodies 47 zodiacal constellations 47 moon Charon 47 asteroids comets 47 V# Mon 47 inhabitable planets 47 Geminid shower 47 astronomer Johannes Kepler 47 Saturnian moon 47 Uranus 47 microquasar 47 perigee moon 47 exoplanets 47 Pleiades cluster 47 radial velocity 47 interstellar dust 47 waning crescent Moon 47 Sromovsky 47 Cometary 47 Tycho Brahe 47 Meteor Showers 47 astronomer Edmond Halley 47 planets orbits 47 Helix Nebula 47 Lunar Eclipse 47 globular cluster M# 47 neutron star 47 SN #A 47 Winter solstice 47 Perseids Meteor Shower 47 SuperMoon 47 celestial phenomena 47 SOHO spacecraft 47 solar flares 47 Delta Aquarids 47 Leonid meteor showers 47 asteroid Eros 47 Coma Cluster 46 Kuiper belt object 46 highly elliptical orbit 46 lunar eclipses 46 Hale Bopp comet 46 planetary transits 46 Omega Centauri 46 elliptical galaxy 46 meteor fireball 46 galaxy 46 earthshine 46 cosmic cannibal 46 sidereal 46 Apophis 46 constellation Lyra 46 Churyumov Gerasimenko 46 cosmic ray 46 Kuiper belt 46 orbiting Mars 46 GRB # 46 asterism 46 galactic cosmic rays 46 planetary nebulae 46 NASA Voyager spacecraft 46 Mars 46 KBOs 46 Solar TErrestrial RElations Observatory 46 orbits 46 perigee 46 star Spica 46 asteroid belt 46 Milky Way galaxy 46 HIP #b 46 outermost planets 46 Sedna 46 Gerard Kuiper 46 supernova explosion 46 gravitational perturbations 46 outermost planet 46 moon Ganymede 46 circular orbits 46 Delta Cephei 46 gravitational waves 46 exoplanets planets outside 46 red supergiant 46 planet orbits 46 NASA MESSENGER spacecraft 46 Gliese #c 46 proto galaxies 46 photosphere 46 Saturn moon Iapetus 46 galaxy M# [001] 46 slender crescent 46 New Horizons spacecraft 46 distant galaxies 46 Evolution Explorer 46 COROT 7b 46 Hubble Telescope 46 OGLE TR #b 46 AU Mic 46 quasars 46 rocky extrasolar planet 46 NEAs 46 ringed planet 46 Infrared Astronomy Satellite 46 Geminid Meteor Shower 46 submillimeter galaxies 46 gamma rays 46 Rosetta spacecraft 46 crescent Moon 46 Kuiper Belt objects 46 Gemini constellation 46 gravitational keyhole 46 extrasolar 46 umbral shadow 46 Milky Way 46 penumbral shadow 46 afterglows 46 stellar occultation 46 meteorite 46 planets circling stars 46 Jenniskens 46 jovian 46 Elenin 46 Perseid meteor 46 Vernal Equinox 46 brightest meteors 45 asteroid collisions 45 interstellar dust particles 45 planets Uranus 45 distant supernovae 45 noctilucent 45 moon Deimos 45 type Ia supernova 45 YU# 45 aurora 45 coronal loops 45 Aqua satellite 45 Comet Encke 45 spaceweather.com 45 ecliptic plane 45 Earth magnetotail 45 smallest exoplanet 45 CoRoT #b 45 KH #D 45 Saturn moons 45 lobate scarps 45 Comet LINEAR 45 Quadrantid 45 Gamma ray bursts 45 waning gibbous 45 CoRoT satellite 45 super perigee moon 45 #gy 45 Capricornus 45 CoRoT 45 Butterfly Nebula 45 HL Tau 45 exoplanet orbiting 45 ESA Rosetta 45 Stardust spacecraft 45 SIRTF 45 exoplanet 45 Messenger spacecraft 45 STEREO spacecraft 45 Kepler spacecraft 45 Cassini flyby 45 Dynamics Observatory 45 galactic halo 45 orbiting 45 Solar Dynamics 45 moonlet 45 NASA twin rovers 45 substorms 45 Proxima Centauri 45 constellation Andromeda 45 constellation Cassiopeia 45 Perseus constellation 45 dirty snowballs 45 VY Canis Majoris 45 SKY WATCH 45 Saturn equinox 45 Hubble telescope 45 magnetar 45 comets meteors 45 moon Enceladus 45 Perseid 45 planemos 45 Comet #P 45 irregularly shaped asteroid 45 Lagoon Nebula 45 Zeta Ophiuchi 45 skywatching 45 Jupiter moon Io 45 habitable planets 45 neutrino 45 Sojourner rover 45 astronomers 45 Kepler #b 45 Compton Gamma Ray 45 transiting planets 45 distant quasar 45 Makemake 45 planetary Transits 45 vernal equinox 45 Carl Sagan 45 solar eclipses 45 Beehive Cluster 45 moons Phobos 45 subatomic particle 45 Mandushev 45 Comet Boethin 45 TRMM satellite 45 wispy clouds 45 Kuiper belt objects 45 Asteroid 45 Solar eclipses 45 planetary astronomer 45 Maunder minimum 45 magnetotail 45 Ranging spacecraft 45 starlight 45 Cancri e 45 interstellar cloud 45 redshifted 45 constellation Carina 45 phyllosilicates 45 moon Io 45 blazar 45 Perseid shower occurs 45 Cosmic Microwave Background 45 Corot 9b 44 distant quasars 44 meteorites 44 planetoids 44 pulsar 44 prograde 44 solar corona 44 XO 3b 44 Hot Jupiters 44 lunar occultation 44 planetary conjunctions 44 starburst galaxies 44 Astronomically 44 microlensing events 44 Perseid meteor showers 44 Deep Impact comet 44 Cassini Image 44 ejecta 44 planetary alignments 44 annual Perseid meteor 44 Orionid Meteor Shower 44 LORRI 44 sunlike star 44 NASA Cassini spacecraft 44 inch Samuel Oschin 44 planets orbiting stars 44 sunspots 44 GRBs 44 Emily Lakdawalla 44 COROT exo 3b 44 penumbral eclipse 44 predawn sky 44 Earth Asteroid 44 Taurid 44 planet HD #b 44 Fomalhaut b 44 comet flyby 44 equinoxes 44 supermassive black hole 44 Globular Cluster 44 MESSENGER 44 starlike object 44 Comet NEAT 44 RS Ophiuchi 44 constellation Centaurus 44 TGFs 44 Kuiper Belt 44 Autumnal Equinox 44 HiRISE camera aboard 44 RXTE 44 spaceward 44 gamma ray observatory 44 proplyds 44 comets moons 44 planets astronomers 44 galaxy cluster 44 Wolszczan 44 interstellar dust samples 44 gamma ray flares 44 comet orbit 44 Cancri 44 Puppis 44 Supermoon 44 colliding galaxies 44 Hanny Voorwerp 44 Gravitational waves 44 Taurus Littrow Valley 44 Kaguya probe 44 Cosmonaut Yuri Gagarin 44 Gliese #e 44 Hubble Space 44 faraway galaxy 44 waxing crescent moon 44 starburst galaxy 44 XMM Newton 44 cometary dust 44 thin crescent moon 44 constellation Pegasus 44 Itokawa asteroid 44 OGLE TR 44 Goldilocks planet 44 equinox 44 Martian crater 44 globular clusters 44 planets comets 44 Clyde Tombaugh discovered 44 Unidentified Flying Object 44 Pluto 44 constellation Ophiuchus 44 Full Moons 44 polar stratospheric 44 planet TrES 44 Comet Elenin 44 Machholz 44 asteroidal 44 Caloris Basin 44 reflection nebula 44 Percival Lowell 44 GEochemistry 44 Earthlike planets 44 Orion constellation 44 Sombrero Galaxy 44 orbiting observatories 44 heavily cratered 44 Swift Ultraviolet Optical 44 exoplanetary 44 dwarf galaxy 44 Skywatchers 44 Horsehead Nebula 44 Clyde Tombaugh 44 constellation Sagittarius 44 Olympus Mons 44 WISE mapped 44 Mars moon Phobos 44 Saturn moon 44 celestial objects 44 Apophis asteroid 44 Pluto Eris 44 gamma ray bursts 44 Taurid meteor shower 44 Heliospheric Observatory 44 Hyades cluster 44 faint smudge 44 flyby spacecraft 43 distant galaxy clusters 43 galactic disk 43 Syrtis Major 43 UDFy # 43 galactic alignment 43 Astronomer Carl Sagan 43 solar eclipse occurs 43 rover Opportunity 43 Asteroid Itokawa 43 exosphere 43 planet orbiting 43 G#.# +#.# 43 NASA Deep Impact 43 Jetman 43 equator 43 umbra 43 Edwin Hubble 43 constellation Auriga 43 protoplanets 43 MErcury Surface Space ENvironment 43 planets orbiting 43 unaided eye 43 Beta Pictoris b 43 trans Neptunian objects 43 rocky planets 43 olivine mineral 43 jet contrails 43 orbiting Hubble Space Telescope 43 BLG #Lb 43 Flyby 43 interstellar dust clouds 43 WISE spacecraft 43 interstellar grains 43 orbited 43 Saturn moon Enceladus 43 geomagnetic activity 43 auroras 43 Saturn Enceladus 43 orbiting Hubble telescope 43 Spaceguard 43 aurorae 43 Mars rovers Spirit 43 heliopause 43 Eridanus 43 Haumea 43 moonlets 43 autumnal equinox 43 Saturnian moons 43 sunspot 43 slender crescent moon 43 Edmund Halley 43 ultraviolet wavelengths 43 interplanetary spacecraft 43 supernova SN 43 elongated orbit 43 accretion disks 43 Sky gazers 43 Hubble 43 tiny meteoroids 43 Comet #P/Holmes 43 OGLE 43 comet Hartley 2 43 galaxy M# [002] 43 constellation Scorpius 43 reionization 43 Jovian moons 43 globular star 43 Rosette Nebula 43 orbiting Saturn 43 eclipsing binaries 43 energetic cosmic rays 43 fainter objects 43 Upsilon Andromedae b 43 supergiant star 43 thrilling stargazers 43 Gamma ray burst 43 intrinsic brightness 43 orbital eccentricity 43 NASA LCROSS 43 martian 43 Gimli Glider 43 orbiting planets 43 Bullet Cluster 43 Cassini Huygens 43 barred spiral galaxy 43 Martian rocks 43 THEMIS 43 binary asteroid 43 infrared telescope 43 auroral displays 43 planet HD#b 43 coronal mass ejections 43 Becky Ramotowski 43 extrasolar planets orbiting 43 baryon 43 Lunar Reconnaissance Orbiter LRO 43 Astronomically speaking 43 muons 43 earthlike 43 martian atmosphere 43 Soviet cosmonaut Yuri Gagarin 43 HiRISE 43 comet #P/Churyumov-Gerasimenko 43 cosmos 43 magnetosphere 43 RRATs 43 gravitational microlensing 43 X ray emission 43 Lunar eclipses 43 unmanned spacecraft 43 Eagle Nebula 43 ESO PR 43 Supernovae 43 Deep Impact eXtended Investigation 43 total lunar eclipse 43 solar prominences 43 super Earths 43 Geminid meteor showers 43 Fermi Gamma ray 43 elongated orbits 43 axial tilt 43 NASA STEREO 43 spiral galaxy 43 Mercury flyby 43 micrometeoroids 42 Lutetia 42 Pegasi 42 comet Shoemaker Levy 42 impactors 42 coronal holes 42 Ontario Lacus 42 elliptical orbit 42 planet gravitational tug 42 Exoplanet 42 Orion nebula 42 eclipsing binary 42 GRB# 42 Late Heavy Bombardment 42 Red Rectangle 42 Arches Cluster 42 nebula 42 Mini TES 42 giant elliptical galaxy 42 Hubble Space Telescope 42 Epimetheus 42 star Fomalhaut 42 plutoid 42 asteroid Lutetia 42 Very Large Array 42 Saturn Uranus 42 cosmic collisions 42 XTE J# 42 QQ# 42 Stephan Quintet 42 Henize #-# 42 Canes Venatici 42 Planck spacecraft 42 globular cluster 42 exosolar planets 42 gravitationally bound 42 Cosmic rays 42 celestial 42 Kepler 9c 42 Steins asteroid 42 Cepheid variables 42 MAVEN 42 Neil DeGrasse Tyson 42 Killer Asteroids 42 galaxies 42 planets moons 42 Triangulum Galaxy 42 quark gluon plasma 42 Meteorites 42 lunar eclipse occurs 42 Shawal moon 42 Stardust NExT 42 spiral galaxy Messier 42 waxing gibbous 42 Ultraviolet Imaging Spectrograph UVIS 42 Charon Pluto 42 robotic explorer 42 magnetars 42 Deep Impact 42 Extrasolar Planet Search 42 asteroid Steins 42 star Gliese 42 Exoplanets 42 solar eclipse 42 eccentric orbits 42 Geminga 42 galaxies collide 42 superbubble 42 Total Lunar Eclipse 42 infalling 42 lunar eclipse 42 airglow 42 Neptune Uranus 42 orbit 42 Samuel Oschin Telescope 42 Giovanni Schiaparelli 42 telescope 42 Canis Major 42 lander Philae 42 Fomalhaut 42 Deep Impact spacecraft 42 Higgs particle 42 Manned missions 42 OSIRIS REx 42 Paul Chodas 42 Earth asteroids 42 Ursa Minor 42 Tunguska Event 42 solar nebula 42 X ray telescopes 42 Earth asteroid Itokawa 42 reddish orange hue 42 supernovas 42 Martian rovers 42 EPOXI mission 42 Scheila 42 Epoxi 42 Kepler Space Telescope 42 dwarf planet 42 Jupiter icy moons 42 constellation Hercules 42 spiral galaxy NGC 42 CoRoT 9b 42 NASA EPOXI mission 42 RHESSI 42 coronal mass ejections CMEs 42 Eratosthenes 42 J# +# [002] 42 exo planet 42 Phoebe orbits 42 Plutoids 42 dwarf galaxies 42 Pluto dwarf 42 Saturn Jupiter Uranus 42 Planets 42 arcseconds 42 Dwarf Planet 42 SpaceWeather.com 42 Dust devils 42 NASA Aqua 42 accretion disk 42 Viking orbiters 42 KAGUYA 42 Mario Livio 42 meteoroid impacts 42 ESO telescopes 42 Extrasolar planets 42 constellation Cetus 42 northern arctic plains 42 galaxy redshift 42 Lunar Prospector 42 ionized gas 42 SN #D 42 inner moons 42 Planetary Transits 42 Martian dust devils 42 novae 42 NASA Kepler telescope 42 EPOXI spacecraft 42 sun corona 42 Saturn outermost ring 42 asteroids orbiting 42 protoplanetary disks 42 supernova explosions 42 Wilkinson Microwave Anisotropy Probe 42 gravitational lens 42 asteroid Vesta 42 Spacecraft 42 extragalactic 42 sunlike stars 42 Space Shuttle Discovery 42 orbited Earth 42 Wolf Rayet stars 42 X ray wavelengths 42 sized planets orbiting 42 comet hurtling 42 proto cluster 42 Uranus Neptune 42 Supernova #A 42 ESA Herschel 42 Earthlike 42 closest flyby 42 observable universe 42 Iapetus 42 Comet Shoemaker Levy 42 brown dwarf 42 partial eclipse 42 Ranging MESSENGER spacecraft 42 Neil deGrasse Tyson 42 millisecond pulsars 42 NASA Kepler 41 Carina constellation 41 Frank Borman 41 Apollo missions 41 solar radii 41 largest moon Charon 41 Virgo Cluster 41 Herschel 41 gamma ray photons 41 Aurora Borealis 41 Perseid showers 41 Nasa Mars Odyssey 41 Martian meteorites 41 Comet 9P/Tempel 1 41 Methone 41 gamma ray emission 41 Astrological lore 41 orbiting Cassini spacecraft 41 cometary material 41 Astronomy buffs 41 spinning pulsar 41 hypervelocity star 41 Grammier 41 spherical halo 41 Doppler Effect 41 star Proxima Centauri 41 habitable planet 41 annular solar eclipse 41 Orbiting 41 Venus transits 41 Beta Pictoris 41 planets orbiting distant 41 blazars 41 HiRISE image 41 Russian cosmonaut Yuri Gagarin 41 Earth Asteroid Rendezvous 41 winged termites 41 Convection Rotation 41 Galilean satellites 41 infrared wavelengths 41 Digitized Sky Survey 41 Angelos Vourlidas 41 Stardust capsule 41 interplanetary dust 41 NASA rovers Spirit 41 novas 41 Io Europa 41 ejecta blanket 41 Extrasolar Planets 41 Mayan calendar ends 41 planet Gliese #g 41 sunspot activity 41 known bird Archaeopteryx 41 starlike 41 moon Titan 41 EPOXI 41 WIMPs 41 constellation Bootes 41 constellation Orion 41 protoplanetary disk 41 filamentary structures 41 mesosphere 41 constellation Canis Major 41 microlensing 41 flyby 41 magnetic reconnection 41 umbral 41 equinox occurs 41 orbital velocity 41 IRAS #-# 41 THEMIS Images 41 Type Ia supernova 41 auroral 41 hydroxyl molecules 41 BP Psc 41 Higgs bosons 41 binary quasar 41 Viking Lander 41 Sojourner Rover 41 galactic clusters 41 Great Observatories 41 amateur skywatchers 41 hadrons 41 asteroid flyby 41 Hadley Rille 41 comet chaser 41 spring equinox 41 Mars Odyssey spacecraft 41 supernova remnant 41 quasar 41 Earthshine 41 Jupiter moons 41 Gravity Probe B 41 Sunspots 41 Explorer WISE 41 RY Sagittarii 41 SIM PlanetQuest 41 Cosmic Background Explorer 41 SN #C 41 moons circling 41 Extrasolar 41 Gliese #g 41 BP Piscium 41 constellation Eridanus 41 foreground galaxy 41 spacecraft 41 Optical Gravitational Lensing Experiment 41 HAT P 41 Gamma rays 41 nebulae 41 Crab Pulsar 41 astronomer 41 Mars Orbiter