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(Click for frequent words.) 80 Perseids 78 Orionids 75 Quadrantids 75 Leonids 74 Geminid meteor shower 74 meteor showers 73 Perseid meteor shower 72 Perseid meteors 71 Quadrantid meteor shower 71 Lyrids 71 Perseid shower 71 meteor shower 70 Geminid 70 Geminid meteors 70 meteors 70 Eta Aquarids 69 Leonid meteor shower 69 Taurids 68 Perseids meteor shower 68 Geminid shower 67 Perseid Meteor Shower 67 Orionid meteor shower 66 Lyrid meteor shower 66 Meteor showers 66 Leonid meteors 65 Geminid meteor showers 64 Leonid Meteor Shower 63 Delta Aquarids 63 Comet Lulin 63 Leonid meteor showers 63 Orionid meteors 63 annual Perseid meteor 63 Eta Aquarid meteor shower 63 Comet NEAT 63 Aurigid 62 constellation Perseus 62 Comet McNaught 62 Perseus constellation 62 Orionid 62 Epsilon Aurigae 61 Comet Holmes 61 thin crescent moon 61 Meteor Shower 61 noctilucent clouds 61 Noctilucent clouds 61 earthshine 61 waxing crescent moon 61 slender crescent 60 waning gibbous moon 60 aurorae 60 waxing gibbous moon 60 skywatchers 60 Comet Machholz 60 Perseids Meteor Shower 60 constellation Leo 60 lunar perigee 59 crescent Moon 59 Leonid meteor 59 Phaethon 59 supermoon 59 Leonid shower 59 Comet Hartley 2 59 Saturn rings 59 Orionid Meteor Shower 59 transiting planets 59 occultations 59 Gamma ray bursts 58 Perseid meteor 58 Pleiades star 58 zodiacal light 58 Geminid Meteor Shower 58 penumbral lunar eclipse 58 Geminids meteor shower 58 occultation 58 Leonids meteor shower 58 Meteor shower 58 auroras 57 unaided eye 57 Toutatis 57 Meteor Showers 57 constellation Gemini 57 aurora 57 predawn sky 57 Swift Tuttle 57 Lunar eclipse 57 comet Lulin 57 Halley comet 57 constellation Aquarius 57 comet Tempel Tuttle 57 Perseid meteor showers 56 total lunar eclipse 56 astronomical objects 56 Andromeda Galaxy 56 comet 56 gaseous planet 56 meteoroids 56 Eta Carinae 56 #P/Holmes 56 GRBs 56 gibbous moon 56 Taurid 56 Halley Comet 56 distant galaxy 56 X ray emission 56 WASP #b 56 star Spica 56 Gamma Virginids 56 transiting planet 56 Comet LINEAR 56 constellation Virgo 56 Type Ia supernova 56 perihelion 56 Pleiades cluster 55 moonset 55 equinox occurs 55 Perseid 55 planetary nebulae 55 gamma ray bursts 55 Beta Pictoris b 55 comets 55 Crab Nebula 55 extrasolar planet 55 asterism 55 substorms 55 gamma ray burst 55 P/# A2 55 planet orbits 55 celestial equator 55 partial lunar eclipse 55 Comet Hartley 55 lunar eclipse 55 annular eclipse 55 Manhattanhenge 55 auroral displays 55 asteroids comets 55 HD #b [002] 55 SCP #F# 55 constellation Taurus 55 Comet Hale Bopp 55 brightest comet 55 astronomical phenomena 55 Antennae Galaxies 55 Orion Nebula 55 constellation Cassiopeia 54 celestial fireworks 54 sky gazers 54 moonrise 54 extrasolar planets 54 planets orbits 54 Gemini constellation 54 red supergiant 54 Omega Centauri 54 COROT 54 planet Uranus 54 SN #gy 54 Earthlike planets 54 occulted 54 aphelion 54 Comet Elenin 54 autumnal equinox 54 equinox 54 Comet Halley 54 exoplanets orbiting 54 retrograde orbit 54 waning gibbous 54 penumbral eclipse 54 Lulin 54 extrasolar 54 Comet Tempel Tuttle 54 equinoxes 54 lunar eclipses 54 afterglows 54 constellation Orion 54 brown dwarfs 54 skywatching 54 Autumnal Equinox 53 meteor 53 fainter meteors 53 waxing crescent 53 GJ #b [002] 53 geomagnetic activity 53 Fermi telescope 53 astronomers 53 Earthlike planet 53 distant supernovae 53 KBOs 53 Corot 7b 53 Pleiades 53 sunspot cycle 53 icy moons 53 Arches Cluster 53 planets orbiting sun 53 TrES 4 53 waning crescent Moon 53 #P/Churyumov-Gerasimenko 53 comet McNaught 53 novae 53 celestial phenomenon 53 annular solar eclipse 53 exoplanet 53 rocky planets 53 polar stratospheric 53 celestial objects 53 Super Earths 53 planets orbiting distant 53 Gliese #c 53 SN #A 53 faint meteors 53 Delta Cephei 53 HiRISE image 53 CoRoT 53 planetary alignments 53 Corot 9b 53 Gliese #g 53 perigee moon 53 perigee 53 spring equinox 53 GRB #B 53 TGFs 53 Lunar eclipses 53 nebulae 53 super Earths 53 Taurid meteor shower 52 BP Piscium 52 millisecond pulsars 52 CoRoT 7b 52 brightest supernova 52 microlensing 52 Betelgeuse 52 waning crescent moon 52 brightest meteors 52 sunspot activity 52 magnetars 52 spaceweather.com 52 constellation Lyra 52 highly elliptical orbits 52 celestial phenomena 52 RXTE 52 celestial object 52 stellar nurseries 52 planetary nebula 52 waning crescent 52 Fomalhaut b 52 HD#b 52 polar vortex 52 distant galaxies 52 innermost planet 52 meteoroid 52 Skywatchers 52 Galilean moons 52 waxing gibbous 52 distant galaxy clusters 52 stellar occultations 52 exo planets 52 cosmological distances 52 WIMPs 52 planets circling 52 fainter objects 52 SpaceWeather.com 52 autumn equinox 52 GRB # 52 sunlike star 52 Kuiper Belt Objects 52 planetary transits 52 interstellar dust 52 protoplanetary disks 52 olivine mineral 52 X ray afterglow 52 Milky Way Galaxy 52 super perigee moon 52 produce colorful auroras 52 waxing moon 52 KH #D 52 constellation Sagittarius 52 radial velocity 52 elliptical orbits 52 gravitationally bound 52 galaxy NGC 52 thin crescent 51 Gamma Virginids shower 51 solar corona 51 Quadrantid 51 Earthlike 51 exoplanetary 51 Red Rectangle 51 Espenak 51 Supernovae 51 amateur astronomers 51 Amateur astronomers 51 moon Charon 51 starburst galaxies 51 globular clusters 51 gamma ray flashes 51 Eagle Nebula 51 Saturnian moon 51 sunlike stars 51 Giovanni Cassini 51 partial eclipse 51 N. Rathnasree 51 Wolszczan 51 Winter solstice 51 type Ia supernova 51 COROT 7b 51 Comet Encke 51 Cepheid variables 51 solar minima 51 quasar 51 El Niños 51 Total Lunar Eclipse 51 retrograde orbits 51 spiral galaxies 51 comet nucleus 51 Cepheids 51 Henize #-# 51 substorm 51 skygazers 51 aurora borealis 51 HM Cancri 51 intrinsic brightness 51 Kuiper Belt Object 51 ringed planet 51 quasars 51 penumbral shadow 51 Popular Astronomy 51 cometary debris 51 sunrises 51 geomagnetic storms 51 sunspots 51 Galilean satellites 51 spiral galaxy NGC 51 Type Ia supernovas 51 planemos 51 luminous galaxies 51 MN4 51 GJ #b [001] 51 supernova 51 neutron star 51 interacting galaxies 51 AGNs 51 Cassini flyby 51 Sky gazers 51 submillimeter galaxies 51 moons 51 inner Oort Cloud 51 telescope Uranus 51 supernovas 51 constellation Bootes 51 eclipsing binary 51 lunar crescent 51 dwarf galaxies 50 AU Mic 50 Saturn moon Enceladus 50 comet orbit 50 Andromeda galaxy 50 planets orbiting stars 50 Helix Nebula 50 XMM Newton 50 gamma ray observatory 50 protostars 50 globulars 50 planet orbiting 50 ultraviolet wavelengths 50 total solar eclipse 50 X ray wavelengths 50 hot Jupiters 50 Kuiper Belt object 50 constellation Auriga 50 Ringed Planet 50 gravitational lens 50 faint galaxies 50 brown dwarf 50 Cancri e 50 Comet #P/Holmes 50 X ray binaries 50 sunspot numbers 50 geomagnetic field 50 Maunder minimum 50 planet Gliese #g 50 Orion constellation 50 gravitational microlensing 50 Kuiper belt 50 supernova explosions 50 CoRoT satellite 50 Supermoon 50 elliptical galaxies 50 Spiral galaxies 50 Oort Cloud 50 Kuiper belt objects 50 millisecond pulsar 50 Kepler #b 50 filamentary structure 50 Hale Bopp 50 microlensing events 50 dwarf galaxy 50 Jupiter Uranus 50 CoRoT 9b 50 Sedna 50 summer solstice 50 elliptical galaxy 50 Upsilon Andromedae 50 Lagoon Nebula 50 exoplanets 50 gamma ray emission 50 constellation Cygnus 50 SN#A 50 supernova explosion 50 ejecta 50 gibbous 50 barred spiral galaxy 50 gamma ray flares 50 Ring Nebula 50 Vernal Equinox 50 Saturn equinox 50 mu Arae 50 sun corona 50 Oort cloud 50 Orion nebula 50 protoplanet 50 Lunar Eclipse 50 MODIS 50 Beehive Cluster 50 cryovolcanism 50 supernovae 50 Partial lunar eclipse 50 Saturn moons 50 Uranus Neptune 50 Explosive eruptions 50 smallest exoplanet 50 cometary 50 wildflower blooms 50 protoplanets 50 orbits 50 habitable worlds 49 Grímsvötn 49 meteor sightings 49 star Gliese 49 phytoplankton blooms 49 coronal loops 49 HL Tau 49 convective clouds 49 Earth asteroids 49 moons orbiting 49 Konacki 49 proplyds 49 ecliptic 49 heaviest precipitation 49 inhabitable planets 49 constellation Andromeda 49 equatorial regions 49 constellations 49 explosive eruptions 49 protoplanetary disk 49 GQ Lupi 49 Total lunar eclipses 49 Jovian moons 49 Kuiper Belt objects 49 ESO PR 49 SuperMoon 49 zodiacal constellations 49 Titan flyby 49 type Ia supernovae 49 dynamical processes 49 vernal equinox 49 infrared wavelengths 49 OGLE TR #b 49 planet TrES 49 Epsilon Eridani 49 galactic disk 49 smoothed sunspot number 49 geoeffective 49 BLG #Lb 49 Higgs particle 49 Type Ia supernovae 49 airglow 49 Hubble observations 49 constellation Ursa Major 49 Bug Nebula 49 eccentric orbits 49 sunspot 49 Helix nebula 49 coronal holes 49 heavily cratered 49 Galaxy Evolution 49 SIRTF 49 GALEX 49 red supergiants 49 umbral shadow 49 cataclysmic eruption 49 sized planets orbiting 49 shadowy craters 49 flyby 49 eruptive activity 49 BP Psc 49 reflection nebula 49 Sunspots 49 slender crescent moon 49 cosmic ray intensity 49 transiting exoplanet 49 Gliese #d 49 altocumulus 49 galaxies 49 pulsars 49 Wolf Rayet stars 49 magnetar 49 habitable planets 49 globular cluster 49 outer corona 49 planets 49 La Niñas 49 Meridiani 49 STEREO spacecraft 49 telescopes 49 COROT exo 3b 49 Maunder Minimum 49 extrasolar planets orbiting 49 starburst galaxy 49 orbiting observatories 49 nebula 49 X ray observatories 49 Gliese #e 49 periodic dimming 49 moon Titan 49 Elliptical galaxies 49 Clouds obscured 49 celestial spectacle 48 midge hatches 48 Jenniskens 48 photosphere 48 moonlets 48 interstellar dust particles 48 solstices 48 axions 48 optical telescopes 48 Astronomers 48 astronomical observations 48 RRATs 48 planet HD #b 48 upwellings 48 merging galaxies 48 phyllosilicates 48 CoRoT #b 48 Sromovsky 48 exoplanet orbiting 48 planets circling stars 48 HF propagation 48 redshift 48 planetary nebulas 48 Mars Uranus 48 constellation Eridanus 48 wispy clouds 48 icy comets 48 cosmic rays 48 Venus transits 48 TRMM satellite 48 GJ#b 48 winter solstice 48 constellations Cygnus 48 comet Hale Bopp 48 recurrent coronal hole 48 constellation Centaurus 48 Earthshine 48 supernovae explosions 48 protostar 48 Mimas 48 Gamma ray burst 48 lunar crust 48 eclipsing binaries 48 bolide 48 Samuel Oschin Telescope 48 auroral activity 48 planets Uranus 48 circular orbits 48 extrasolar planetary systems 48 Higgs bosons 48 volcanic plumes 48 spiral nebulae 48 RS Ophiuchi 48 Hanny Voorwerp 48 Syrtis Major 48 tidally locked 48 moon Enceladus 48 planetary embryos 48 galaxy cluster 48 Enceladus 48 supernova remnant 48 WD5 48 Type Ia 48 solar flares 48 HD# [002] 48 Solar Dynamics Observatory 48 X ray pulses 48 starlike object 48 emission nebula 48 diffuse aurora 48 Iapetus 48 NASA Cassini spacecraft 48 Libra constellation Vogt 48 Great Orion Nebula 48 insect hatches 48 orbiting Hubble Space Telescope 48 brightnesses 48 solar irradiance 48 Solar eclipses 48 Jupiter moon Io 48 gravitational lenses 48 astrophysicists 48 Mercury Uranus 48 Saturn moon Mimas 48 Scattered flurries 48 geomagnetic storm 48 Astronomy buffs 48 chondrules 48 UDFy # 48 UB# [003] 48 coronal mass ejection 48 earthlike planets 48 SKY WATCH 48 Zeta Ophiuchi 48 YORP effect 48 TrES 48 gravitational lensing 48 Saturn moon 48 polarimetry 48 Cosmic rays 48 V# Mon 48 nursery Carina Nebula 48 Jupiter moons 48 moonlet 48 Saturn Enceladus 47 permanently shadowed craters 47 orbiting Saturn 47 extragalactic 47 Triangulum 47 Spitzer Space Telescope 47 Rathnashree 47 cirrus clouds 47 Aurora Borealis 47 moons orbiting Saturn 47 NASA Chandra 47 supersymmetric particles 47 Microlensing 47 Triangulum Galaxy 47 cosmic cannibal 47 optical wavelengths 47 variably cloudy skies 47 active galactic nuclei 47 Fomalhaut 47 gaseous planets 47 gravitational interactions 47 Tempel Tuttle 47 constellation Cetus 47 RQ# 47 Jupiter Saturn 47 scattered flurries 47 planets orbiting 47 interglacial periods 47 Neptune Uranus 47 auroral 47 rocky extrasolar planet 47 polar latitudes 47 submillimeter wavelengths 47 Opportunity rover 47 Ulysses spacecraft 47 mayfly hatches 47 waterspouts 47 constellations planets 47 SN #C 47 Mpc 47 noctilucent 47 Comet Tempel 1 47 spiral galaxy 47 galaxies collide 47 SN #D 47 Galileo spacecraft 47 comet tail 47 Aurora borealis 47 distant quasar 47 Voorwerp 47 La Ninas 47 exoplanetary systems 47 AB Aurigae 47 inch Samuel Oschin 47 asteroid 47 supervolcanoes 47 Milky Way 47 Uranus Jupiter 47 ultraviolet imaging spectrograph 47 Saturn Cassini 47 coronal mass ejections CMEs 47 Extrasolar planets 47 galaxy M# [001] 47 LCROSS spacecraft 47 YU# 47 sky darkens 47 Muchachos Observatory 47 fruit ripens 47 blazar 47 # Apophis 47 Gravitational waves 47 Perseid showers 47 meteor fireball 47 arcseconds 47 northern latitudes 47 winged termites 47 gamma ray bursts GRBs 47 tidal bulge 47 photometry 47 Grillmair 47 novas 47 Martian craters 47 spacecraft flyby 47 solstice 47 galaxy M# [002] 47 southerly latitudes 47 potentially habitable planets 47 Contrails 47 planets astronomers 47 Ontario Lacus 47 meteorologists predict 47 meteor streaked across 47 cosmic ray flux 47 elongated orbits 47 energetic electrons 47 habitable zones 47 Goldilocks planet 47 midlatitudes 47 HARPS spectrograph 47 Comet #P 47 Venus Uranus 47 lava flows 47 Elenin 47 NEAs 47 planetary conjunctions 47 cometary dust 47 accretion disk 47 Butterfly Nebula 47 Olympus Mons 46 exosphere 46 jet contrails 46 Saturn moon Iapetus 46 HD #b [001] 46 permanently shadowed regions 46 snowfall accumulations 46 volcanic plume 46 Trapezium 46 Saturn auroras 46 impactors 46 towering cumulus clouds 46 galaxy clusters 46 X ray telescopes 46 #gy 46 Crab Pulsar 46 Capricornus 46 Extrasolar Planets 46 Rossby waves 46 Gondolo 46 dust devils 46 interstellar cloud 46 thrilling stargazers 46 Trifid Nebula 46 coronal hole 46 starlight 46 prominences 46 Saturnian 46 airmass 46 galactic cosmic rays 46 atmospheric phenomena 46 spacecraft Cassini 46 shadowed craters 46 observatories 46 exoplanets planets outside 46 atmospheric turbulence 46 meteorites 46 equatorial latitudes 46 climatologically 46 solar nebula 46 interstellar dust clouds 46 Nasa spacecraft 46 interstellar grains 46 Krakatoa erupted 46 constellation Libra 46 galaxy formation 46 comets orbiting 46 Cassini spacecraft 46 NGC #A 46 SN #E 46 lunar occultation 46 La Niña pattern 46 Astrophysical Journal 46 nightglow 46 micron wavelengths 46 ray Space Telescope 46 Rosette Nebula 46 interstellar clouds 46 SOHO spacecraft 46 lensing galaxy 46 Venusian atmosphere 46 Peony nebula star 46 moon Io 46 Alex Filippenko 46 Milky Way galaxy 46 gravitational waves 46 astronomical calculations 46 hydrated minerals 46 QQ# 46 mesosphere 46 orbital eccentricity 46 Coma Cluster 46 Supernova #A 46 lobate scarps 46 Cassini flybys 46 fissure eruption 46 hypervelocity stars 46 Stargazers 46 MG J# +# 46 coronal loop 46 Winter Solstice 46 Kepler 9b 46 Pluto Charon 46 highly magnetized neutron 46 mineral olivine 46 Dumbbell Nebula 46 Planck spacecraft 46 distant quasars 46 Comet McNaught discovered 46 Gamma rays 46 dinosaur extinction 46 Hot Jupiters 46 Cassini 46 Solar System 46 Virgo Cluster 46 variably cloudy 46 transiting exoplanets 46 blazars 46 ULP cepheids 46 austral summer 46 Spaceweather.com 46 Herschel Space 46 Patchy frost 46 Upsilon Andromedae b 46 meteors streaking 46 polar craters 46 Astrophysical Journal Letters 46 Scorpius 46 constellation Aquila 46 gravitational perturbations 46 changeable cloudy 46 Cassiopeia 46 belched ash 46 ULIRGs 46 reionization 46 galactic mergers 46 cloudcover 46 globular cluster M# 46 cloudiest 46 Cat Paw Nebula 46 G#.# +#.# 46 polar mesospheric clouds 46 spokesman Jeff Cuson 46 J# +# [002] 46 atmospheric disturbances 46 umbral 46 Widespread frost 46 binary asteroid 46 planet transits 46 HiRISE images 46 asteroids 46 HARPS spectrograph attached 46 Hipparcos 46 Earth orbiting satellites 46 meteoroid impacts 46 spherically symmetric 46 hummingbird moth 46 ionized gases 46 cometary material 46 CMB radiation 46 Increasing cloudiness 46 gravitational redshift 46 Einar Kjartansson geophysicist 46 Saturnian moons 46 magnetotail 46 cosmic ray 46 supergiant stars 46 spotty showers 46 IntergalaticEarth 46 PSR J# 46 constellation Hercules 46 asteroid Vesta 45 tropical latitudes 45 circumstellar disks 45 coronal mass ejections 45 moon Ganymede 45 outermost planets 45 spectroscopic observations 45 EPOXI spacecraft 45 masers 45 Charon Pluto 45 planets comets 45 X ray binary 45 Venus Jupiter Uranus 45 God Particle 45 microquasar 45 cluster NGC 45 spherical halo 45 Martian volcanoes 45 infrared satellite imagery 45 Comet Swift 45 terrestrial planets 45 Eridanus 45 cosmic microwave background 45 primitive meteorites 45 Jack Horkheimer 45 foreshocks 45 Hyakutake 45 meteorite impacts 45 Magellanic Clouds 45 distant supernovas 45 Solar TErrestrial RElations Observatory 45 partial solar eclipse 45 Beta Pictoris 45 sterile neutrino 45 Goldilocks zone 45 Sommers Bausch Observatory 45 amateur skywatchers 45 biosignatures 45 IRC +# 45 GRB #A 45 RHESSI 45 Dennis Mammana 45 metallicity 45 Earth axial tilt 45 Canis Major 45 stellar occultation 45 meteorite bombardment 45 Kepler telescope 45 nucleosynthesis 45 silicate dust 45 Digitized Sky Survey 45 Jupiter moons Europa 45 GRB# 45 warbler species 45 star gazers 45 journal Icarus 45 Algol 45 sulfate aerosols 45 protoplanetary discs 45 V# Puppis 45 autumn equinoxes 45 solar eclipses 45 constellation Carina 45 PSR J# +# 45 SN #ha 45 NASA Cassini 45 coral spawning 45 Afternoon Showers 45 planetary Transits 45 magnetic substorms 45 exosolar planets 45 Voyager spacecraft 45 Exoplanets 45 interstellar dust grains 45 Halton Arp 45 Stephan Quintet 45 blue supergiant 45 Perseid meteor shower skygazers 45 La Nina occurs 45 visible wavelengths 45 snowshowers 45 supergiant star 45 lunar eclipse occurs 45 Peter Jenniskens 45 t'storms 45 nebulas 45 rotating neutron stars 45 Neptune Jupiter 45 HiRISE camera aboard 45 Kepler 9c 45 Mercury flyby 45 Cosmic Collisions 45 Fred Espenak 45 ENSO neutral conditions 45 caddis hatches 45 Dry Valleys 45 energetic cosmic rays 45 Alfven waves 45 VY Canis Majoris 45 orbiting planets 45 solar radii 45 Steins asteroid 45 comet dust 45 measurable snowfall 45 Perseus Cluster 45 particle colliders 45 faraway galaxies 45 astrophysical phenomena 45 contrail 45 moons Europa 45 Supernovas 45 Cosmic Microwave Background CMB