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(Click for frequent words.) 80 comet Shoemaker Levy 71 Shoemaker Levy 60 supernova explosion 59 meteoroid 57 gaseous planet 57 protoplanets 57 spiral galaxy NGC 56 Deep Impact probe 56 micrometeoroids 56 moon Io 56 Galileo spacecraft 56 galactic clusters 56 volcanic moon Io 56 ejecta 56 meteoroids 55 gravitational interactions 55 Trojan asteroids 55 moon Ganymede 55 Bullet Cluster 55 icy comets 55 Ring Nebula 55 Apophis asteroid 55 meteor 55 Comet Halley 54 impactors 54 cometary debris 54 comet 54 supernova explosions 54 Murchison meteorite 54 gravitational tides 54 Tunguska meteorite 54 New Horizons spacecraft 54 planets orbits 54 outermost planets 54 galaxy NGC 53 planet Uranus 53 Nasa spacecraft 53 asteroid 53 RS Ophiuchi 53 Neutron stars 53 LCROSS spacecraft 53 GJ#b 53 SN #gy 53 cometary 53 Type Ia supernova 53 comet nucleus 53 Comet Hartley 53 iridium layer 53 runaway thermonuclear 53 galaxy M# [001] 53 galactic disk 52 constellation Carina 52 Voyager spacecraft 52 sunlike star 52 Late Heavy Bombardment 52 Upsilon Andromedae 52 planetesimals 52 Cabeus crater 52 Saturn rings 52 Tunguska Siberia 52 protoplanet 52 merging galaxies 52 Halley comet 52 comet Tempel 1 52 brightest supernova 52 coronal mass ejection 52 P/# A2 52 icy moons 52 Japan Hayabusa spacecraft 52 NASA Voyager spacecraft 51 AB Aurigae 51 X ray telescopes 51 TrES 4 51 Comet Tempel Tuttle 51 inner asteroid belt 51 Leonid meteor 51 Upsilon Andromedae b 51 Jovian atmosphere 51 reionization 51 Trifid Nebula 51 Fomalhaut b 51 SN #C 51 moons orbiting 51 GQ Lupi 51 planet magnetosphere 51 supercontinent 51 airbursts 51 Viking Lander 51 GRB #B 51 planetary embryos 51 SN #A 51 NASA Stardust spacecraft 51 martian atmosphere 51 asteroids comets 51 flyby spacecraft 51 Ulysses spacecraft 51 planets moons 51 telescopic observations 51 planetary nebula 51 Galilean moons 51 Earth magnetosphere 51 Tunguska explosion 51 colliding galaxies 51 moonlet 51 galaxy M# [002] 51 comet McNaught 51 comets asteroids 51 Triangulum 51 comet tail 50 circumstellar 50 coronal mass ejections CMEs 50 spacecraft flyby 50 supernova SN 50 Tunguska Event 50 Sagittarius dwarf galaxy 50 exoplanets orbiting 50 supernova remnants 50 protoplanetary 50 Comet #P 50 interstellar particles 50 cluster NGC 50 micrometeorite 50 WD5 50 Sumatra Andaman earthquake 50 Eagle Nebula 50 YU# 50 Tycho supernova 50 galactic halo 50 infalling 50 Tunguska 50 solar nebula 50 filamentary structures 50 gamma ray burst 50 cosmic collisions 50 z ~ 50 meteorite 50 protostars 50 distant quasar 50 Bug Nebula 50 cometary impacts 50 Quadrantids 50 lunar crust 50 Epsilon Eridani 50 millisecond pulsar 50 WASP #b 50 Nikku Madhusudhan 50 Permian extinction 50 COROT exo 3b 50 red supergiant 50 HIP #b 50 proton antiproton 50 type Ia supernovae 50 ejecta blanket 50 Comet Holmes 50 supernovae explosions 50 spiral nebulae 50 circumstellar disk 50 meteorite fragments 50 Centaur rocket 50 Fermi telescope 50 AU Mic 50 galaxies collide 49 waning crescent moon 49 V# Mon 49 proto galaxies 49 planet Nibiru 49 comets 49 asteroids orbiting 49 asteroid impacts 49 QQ# 49 blue straggler 49 impactor spacecraft 49 meteor impacts 49 moons Phobos 49 astronomer Clyde Tombaugh 49 cosmic cannibal 49 elliptical galaxy 49 cometary dust 49 circumstellar dust 49 Cygnus X 49 Deep Impact comet 49 dwarf galaxy 49 RQ# 49 Wolf Rayet star 49 Type 1a supernova 49 Sojourner Rover 49 KT extinction 49 protoplanetary disks 49 ESA Rosetta 49 WMAP satellite 49 neutron stars 49 Antennae Galaxies 49 highly magnetized neutron 49 transiting planet 49 binary asteroid 49 sized planets orbiting 49 Martian crater 49 stellar occultations 49 interstellar dust 49 spacecraft Cassini 49 Methone 49 Comet Tempel 1 49 Sensing Satellite LCROSS 49 magnetar 49 Chicxulub crater 49 Baptistina 49 OGLE TR 49 Valles Marineris 49 gamma ray burst GRB 49 laboratory Skylab 49 interstellar dust grains 49 Galaxy Evolution 49 asteroidal 48 penumbral lunar eclipse 48 heavily cratered 48 Gusev crater 48 Tempel Tuttle 48 Jupiter moon Io 48 Corot 7b 48 basaltic rocks 48 Asteroid Belt 48 Iapetus 48 blue supergiant 48 La Conchita perched 48 spherical halo 48 SN #E 48 collisional 48 galaxy clusters 48 Kuiper Belt object 48 Stardust spacecraft 48 KT boundary 48 lunar crater 48 Cosmic Background Explorer 48 XMM Newton satellite 48 extrasolar 48 spacecraft 48 Chicxulub 48 lensing galaxy 48 circumstellar disks 48 barred spiral galaxy 48 Pleiades star 48 spherically symmetric 48 nebular 48 spiral galaxy Messier 48 accreting 48 moonlets 48 interstellar dust clouds 48 comet Wild 48 #gy 48 called lobate scarps 48 TrES 48 globulars 48 Deep Impact craft 48 ESA SMART 48 Comet Hartley 2 48 Haumea 48 Comet 9P/Tempel 1 48 planetoids 48 faraway galaxies 48 Galilean satellites 48 orbiting 48 Cassini flybys 48 Virgo Cluster 48 Red Rectangle 48 Zeta Ophiuchi 48 Cancri 48 Tunguska object 48 hadron collider 48 meteorite impacts 48 asteroid Apophis 48 accretion disks 48 RXTE 48 Beta Pictoris 48 dynamical evolution 48 distant galaxy 48 Orbiting Carbon Observatory 48 Toutatis 48 Kepler #b 48 meteorite bombardment 48 red supergiants 48 constellation Cassiopeia 48 moon Mab 48 Epsilon Aurigae 48 gravitational slingshot 48 planetesimal 48 Churyumov Gerasimenko 48 magnetospheric 48 LCROSS 48 Sagittarius B2 48 NASA Opportunity rover 48 moon permanently shadowed 48 shepherding spacecraft 48 Supernova #A 48 GRB # 48 meteorites 48 X ray emission 48 HAT P 48 telescope Uranus 48 rover Spirit 48 fearsome Tyrannosaurus rex 48 Milky Way Galaxy 48 Shuttle Challenger 48 Carina constellation 48 interferogram 47 orbiting Hubble telescope 47 sundog 47 eclipsing binary 47 Cosmonaut Yuri Gagarin 47 ESA XMM Newton 47 Wilkinson Microwave Anisotropy Probe 47 planet WASP #b 47 Virgo cluster 47 trans Neptunian objects 47 moon Deimos 47 X ray observatory 47 jovian 47 HD# [002] 47 gravitationally bound 47 microlensing events 47 Andromeda galaxy 47 SN#A 47 Wolf Rayet stars 47 Lunokhod 47 Hubble Space Telescope HST 47 Hale Bopp 47 proto planetary disks 47 Sumatran earthquake 47 Arches Cluster 47 Gamma Virginids 47 planetary nebulas 47 X ray binary 47 satellites orbiting Earth 47 millisecond pulsars 47 Messenger spacecraft 47 RS Oph 47 lunar meteorites 47 ATLAS detector 47 hypervelocity stars 47 micrometeoroid impacts 47 Voyager probes 47 celestial object 47 Kuiper belt 47 globular clusters 47 Titan flyby 47 GJ #b [001] 47 proplyds 47 Konacki 47 Earth ionosphere 47 bolide 47 exo planets 47 Samuel Oschin Telescope 47 OGLE TR #b 47 constellation Centaurus 47 CoRoT 47 planemos 47 slender crescent 47 accretion disk 47 Comet Encke 47 SN #cr 47 Gamma ray burst 47 HD #b [001] 47 HiRISE image 47 THEMIS satellites 47 onrushing comet 47 WISE infrared 47 filamentary structure 47 interplanetary spacecraft 47 Jupiter magnetosphere 47 Kuiper belt objects 47 Northridge temblor 47 Saturnian moons 47 galactic mergers 47 EF5 tornado 47 star Gliese 47 Hellas Basin 47 Saturn magnetosphere 47 Taurus Littrow Valley 47 starburst galaxies 47 VY Canis Majoris 47 extrasolar planets 47 landing superheated gases 47 comet particles 47 reionization epoch 47 Swift Tuttle 47 orbital debris 47 galactic collisions 47 island volcano Krakatoa 47 SL9 47 HM Cancri 47 satellite Sputnik 47 copper impactor 47 planet TrES 47 Geminid meteor showers 47 Permian Triassic extinction 47 GA6 47 subatomic particles 47 stellar occultation 47 impactor 47 positronium atoms 46 WISE mapped 46 smallest exoplanet 46 neighboring Andromeda galaxy 46 heliosheath 46 proto cluster 46 ESO telescopes 46 Scheila 46 #P/Churyumov-Gerasimenko 46 SN #D 46 galaxy cluster 46 Martian meteorites 46 lobate scarps 46 comets orbiting 46 gravitational lenses 46 Chicxulub Crater 46 gravitational interaction 46 NASA Cassini spacecraft 46 inner moons 46 Gravitational waves 46 redshifted 46 Stephan Quintet 46 retrograde orbit 46 NGC #A 46 binary quasar 46 Uranus Neptune 46 RHESSI 46 celestial sphere 46 comet Tempel Tuttle 46 whiz harmlessly 46 Mars Pathfinder 46 Hubble observations 46 distant supernovae 46 planet HD #b 46 GALEX 46 constellation Virgo 46 ringed planet 46 interstellar clouds 46 twin Voyager spacecraft 46 protostar 46 arcminutes 46 giant elliptical galaxy 46 Mars Pathfinder lander 46 planetary nebulae 46 magnetosphere 46 strangelet 46 Krakatoa eruption 46 Foton spacecraft 46 Veil Nebula 46 moon Mimas 46 comet dust 46 spherules 46 helium nuclei 46 spacecraft orbiting 46 asteroid Eros 46 NASA LCROSS 46 magnetars 46 Solar Dynamics Observatory 46 carbonaceous chondrites 46 galactic bulge 46 Martian dust 46 relativistic jets 46 onboard Chandrayaan 46 infall 46 exo planet 46 planets orbiting distant 46 Eridanus 46 pyroclastic flow 46 Magellanic Stream 46 type Ia supernova 46 mu Arae 46 Antiope 46 celestial phenomena 46 TNOs 46 NEAs 46 moons Io 46 Pleiades cluster 46 Cat Paw Nebula 46 sunlike stars 46 Type Ia supernovas 46 Higgs bosons 46 Tunguska asteroid 46 G#.# +#.# 46 weather satellite TIROS 46 cometary material 46 distant quasars 46 planet transits 46 elliptical galaxy NGC 46 orbiting Hubble Space Telescope 46 PASADENA Calif. Astronomers 46 deuterium atoms 46 tornadic winds 46 rover Spirit landed 46 coronal loop 46 XTE J# 46 Helix nebula 46 closest flyby 46 Sojourner rover 46 Chicxulub impact 46 cosmic phenomena 46 exosphere 46 Omega Centauri 46 double helix nebula 46 asteroid Steins 46 probe Huygens 46 occultations 46 telescopes astronomers 46 atomic nuclei 46 astrophysical phenomena 46 moons circling 46 dinosaur extinction 46 Hurricane Opal 46 Cambrian explosion 46 galactic cosmic rays 46 IBEX spacecraft 46 Cancri e 46 galaxies 46 Martian rovers 46 periodic dimming 46 planets asteroids 46 Planck spacecraft 46 X ray observatories 46 orbited 46 comet Churyumov Gerasimenko 46 waxing gibbous moon 46 orbiting observatory 46 antimatter particles 46 protoplanetary disk 46 Martian meteorite 46 crustal plates 46 Saturn moon Mimas 46 Apollo missions 46 gravity warps 46 Entire subdivisions 46 Einstein relativity theory 46 subatomic scale 45 NASA rover Opportunity 45 HL Tau 45 tropical cyclone Nargis 45 spinning neutron 45 Ares IX rocket 45 cosmic microwave radiation 45 inhabitable planets 45 foreground galaxy 45 Epimetheus 45 spiral galaxy 45 seafloor sediments 45 Mpc 45 moon Phobos 45 Adam Riess 45 Cryogenian period 45 COROT 45 Martian equator 45 planetary orbits 45 AGNs 45 NASA Deep Impact 45 substorm 45 SOHO spacecraft 45 Dumbbell Nebula 45 Jupiter gravitational pull 45 constellation Ophiuchus 45 Earthly contamination 45 hypervelocity 45 nucleosynthesis 45 meteoritic material 45 ejecta plume 45 retroreflector 45 LORRI 45 micrometeoroid 45 Deep Impact flyby spacecraft 45 Toba eruption 45 Jovian moons 45 tectonic plate movements 45 meteorite craters 45 exoplanetary 45 silicon monoxide 45 planets orbiting sun 45 transiting planets 45 Milky Way galaxy 45 neutralinos 45 crater Cabeus 45 pallasite meteorite 45 Landsat satellite 45 supernovae 45 Spitzer infrared spectrograph 45 annular eclipse 45 gustnado 45 Alycia Weinberger 45 asteroid Vesta 45 zodiacal constellations 45 X ray afterglow 45 HD#b 45 NASA twin rovers 45 Jupiter Ganymede 45 SpaceX Falcon 45 exoplanets planets 45 Syrtis Major 45 ionised gas 45 lunar surface 45 Venus transits 45 Earth asteroid Itokawa 45 ESA Huygens probe 45 Milky Way halo 45 orbiting observatories 45 interstellar cloud 45 galaxy NGC# 45 Cassini Huygens spacecraft 45 THEMIS spacecraft 45 Saturn moon Enceladus 45 spiral galaxies 45 baryon 45 astronomical phenomena 45 asteroids 45 STEREO spacecraft 45 CoRoT #b 45 Orion nebula 45 infalling gas 45 Stardust capsule 45 MESSENGER spacecraft 45 Oort cloud 45 Orionid meteor shower 45 exoplanet orbiting 45 Comet Hale Bopp 45 Mojzsis 45 Eta Carinae 45 meteoroid impacts 45 KBOs 45 NASA EPOXI mission 45 supervolcanoes 45 BP Psc 45 Fornax cluster 45 Mandushev 45 Flyby spacecraft 45 ionized particles 45 Kuiper belt object 45 supergiant star 45 lunar meteorite 45 singularities 45 Nili Fossae 45 branes 45 interacting galaxies 45 antiproton 45 polar vortex 45 Hipparchus 45 Hiroshima atomic bombs 45 Lunar Crater Observation 45 NASA Chandra 45 Pluto Charon 45 Solar TErrestrial RElations Observatory 45 chondritic meteorites 45 interstellar grains 45 foam insulation peeled 45 coronal loops 45 Io Europa 45 tidal tails 45 orbiting Cassini spacecraft 45 Viking landers 45 eclipsing binaries 45 Phaethon 45 Meteor showers 45 globular star 45 Itokawa 45 Aqua satellite 45 NASA STEREO 45 galactic cores 45 phyllosilicates 45 Cometary 45 afterglows 45 Hot Jupiters 45 arcsec 45 Ringed Planet 45 superstorms 45 Meteosat 45 proto planetary disk 45 planets comets 45 constellation Cetus 45 ULIRGs 45 V# Sgr 45 Cosmic Microwave Background 45 Kepler Telescope 45 asteroid Itokawa 45 magnetotail 45 cosmic ray particles 45 magnetic dynamo 45 J#.# [001] 45 Hayabusa spacecraft 45 microquasar 45 NASA Kepler telescope 45 X ray wavelengths 45 solar flares 45 micro meteorites 45 Saturn outermost ring 45 GRBs 45 Viking orbiters 45 proton antiproton collisions 45 Qantas superjumbo Rolls Royce 45 constellation Aquarius 45 annular solar eclipse 45 geomagnetic storm 45 planets orbiting stars 45 Amateur astronomers 45 extrasolar planetary 45 quark gluon plasma 45 Rosette Nebula 45 Kuiper Belt Objects 45 atmospheric disturbances 45 Ithaca Chasma 45 Lyrid meteor shower 45 Avishay Gal Yam 45 novas 45 Cumbre Vieja 45 olivine crystals 45 lunar equator 45 gravitational tugs 45 Quadrantid meteor shower 45 starquakes 45 Helix Nebula 45 orbiting telescope 45 Saturnian moon 45 Oort Cloud 45 Opportunity rover 45 cosmic strings 45 interstellar dust tiny 45 slender crescent moon 45 thin crescent 45 Orbiter LRO 45 supercontinent Pangaea 44 retrograde orbits 44 Orion constellation 44 neutron star 44 tektites 44 interstellar medium 44 Diviner instrument 44 Gondwanaland 44 Saturn Jupiter Uranus 44 Carina Nebula 44 micron wavelengths 44 penumbral eclipse 44 Itokawa asteroid 44 novae 44 Giovanni Cassini 44 Reconnaissance Orbiter 44 asteroid collisions 44 X ray pulses 44 galactic cannibalism 44 Saturn equinox 44 Cambrian Period 44 LRO spacecraft 44 Mount Tambora 44 Mars Neptune Uranus 44 Noachian era 44 martian rocks 44 Viking Orbiter 44 GRB# 44 Ayles Ice Shelf 44 star Beta Pictoris 44 Ordovician extinction 44 Cassini flyby 44 Perseid meteor 44 supernovas 44 aurorae 44 Orionids 44 twin STEREO spacecraft 44 cosmic microwave background 44 umbral shadow 44 Geminid meteors 44 transiting exoplanets 44 zodiacal dust 44 microlensing 44 Cassini spacecraft orbiting 44 quasar 44 Explorer WISE 44 Eridani 44 Planck satellite 44 Tempel 1 44 Neil Gehrels 44 Drygalski ice tongue 44 supermassive 44 Grammier 44 Heston facial 44 constellation Andromeda 44 supergiant stars 44 moons Europa 44 muon neutrino 44 magnitude temblor 44 gravitational microlensing 44 PSR J# 44 extrasolar planet 44 Saturn moons 44 constellation Lyra 44 Neptune Uranus 44 penumbral shadow 44 Cosmologists 44 RX J# 44 supernova remnant 44 planet orbiting 44 mock warhead 44 transiting exoplanet 44 rocky planets 44 Antarctic ozone 44 outer corona 44 shuttle disintegrated 44 Saturn moon Iapetus 44 Hipparcos 44 CLG J# # 44 overlapping fireballs 44 NASA Great Observatories 44 Beta Pictoris b 44 WISE telescope 44 Lander robotic arm 44 Chicxulub asteroid 44 Andromeda Galaxy 44 nebulae 44 auroral 44 celestial fireworks 44 magnetic monopoles 44 gaseous planets 44 Tycho supernova remnant 44 particles WIMPs 44 moons orbiting Saturn 44 SIRTF 44 Orcus Patera 44 magma ocean 44 reentry capsule 44 Meteor Crater 44 COROT 7b 44 detect gravitational waves 44 superstrings 44 observable universe 44 celestial spectacle 44 Saturnian 44 orbiter 44 Candor Chasma 44 fissure eruption 44 Gal Yam 44 comet Hale Bopp 44 Andromeda XII 44 Earth orbiting satellites 44 infrared telescope 44 tiny meteoroid 44 Martians invading 44 infrared telescopes 44 constellation Ursa Major 44 NROL 44 Imaging Spectroradiometer MODIS instrument 44 innermost planet 44 Kepler spacecraft 44 Orionid 44 faintest galaxies 44 Hubble telescope 44 spacecraft Hayabusa 44 Trifid 44 Mars Odyssey spacecraft 44 Krakatoa erupted 44 galactic alignment 44 Earth magnetotail 44 carbon cenospheres 44 mineral olivine 44 planetoid 44 MN4 44 supernova 44 hypervelocity star 44 XMM Newton 44 Martian craters 44 spaceward 44 teraelectronvolts TeV 44 Ares Vallis 44 Earthlike planet 44 tectonic activity 44 interstellar dust particles 44 Mars Odyssey orbiter 44 Orion Nebula 44 bipod ramp 44 Antennae galaxies 44 globular cluster 44 excavated crater 44 cosmic ray 44 carbonaceous chondrite 44 NASA Lunar Prospector 44 Herschel telescope 44 ray Space Telescope 44 proton collisions 44 Martian atmosphere 44 Astrophysicists 44 planetary Transits 44 ferric oxides 44 J# +# [002] 44 Huygens lander 44 pallasite 44 zodiacal light 44 Meen Rashi 44 Space Telescope 44 SMBH 44 Planck telescope 44 shuttle Challenger 44 exoplanet hunter 44 Yellowstone supervolcano 44 X ray Observatory 44 shuttlecock shaped capsule 44 planets Uranus 44 quasars 44 Hanny Voorwerp 44 Gerard Kuiper 44 Mars Reconnaissance Orbiter MRO 44 DISR 44 supercontinent Pangea 44 Lagoon Nebula 44 energetic electrons 44 electron orbits 44 outer planets 44 rotating neutron 44 strangelets 44 Hesperian Epoch 44 rocky extrasolar planet 44 comet Hartley 2 44 Apophis 44 HIRES spectrometer 44 comet orbit 44 SDSS II 44 deep convective clouds 44 S/# [001] 44 Heliospheric Observatory SOHO 43 micrometeorites 43 constellation Hercules 43 Nibiru 43 Mercury flyby 43 Cassini Regio 43 Mimas 43 visible wavelengths 43 Keck Interferometer 43 Globular clusters 43 Hesperian epoch 43 chondrite 43 BP Piscium 43 Boslough 43 Perseid shower 43 Corona Australis 43 Hadean Eon 43 extragalactic 43 supernova remnant Cassiopeia 43 magnetic reconnection 43 Lake Cheko 43 planets orbiting 43 baryonic 43 reflection nebula 43 SNR #-#.# 43 Rosetta spacecraft 43 Earth radii 43 atomic particles 43 orbiting planets 43 blackholes 43 meteors 43 Sensing Satellite 43 Martian terrain 43 inch Samuel Oschin 43 Enceladus flybys 43 Comet Elenin 43 ionized gases 43 atomic nucleus 43 dwarf galaxies 43 Martian landscape 43 Geminga 43 sulfur isotope 43 Earth asteroids NEAs 43 XO 3b 43 supermassive stars 43 EF4 tornado 43 Steins asteroid 43 hydrosphere 43 lunar perigee 43 Horizons spacecraft 43 pulsar 43 Deep Impact spacecraft 43 gamma ray observatory 43 cometary particles 43 stony meteorites 43 Keck Telescope 43 unpolarized 43 planet Gliese #g 43 orbits Saturn 43 dense clumps 43 Venetian cannon 43 Large Magellanic Cloud 43 unmanned spacecraft 43 Redoubt blew 43 Caloris Basin 43 #P/Holmes 43 craters 43 tidal bulge 43 sunspot 43 Arsia Mons 43 gaseous envelope 43 equatorial plains 43 terrestrial planets 43 proton proton 43 Earthlike 43 arctic plains 43 solar corona 43 grabens 43 stunned sunbathers 43 Solar System