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(Click for frequent words.) 81 Milky Way galaxy 78 Milky Way 74 Andromeda galaxy 74 galaxy 72 Andromeda Galaxy 71 galaxies 70 constellation Ursa Major 69 spiral galaxy 69 distant galaxies 69 nebula 68 distant galaxy 68 Orion Nebula 68 neutron star 68 globular cluster 68 constellation Virgo 68 planets orbiting stars 68 supermassive black holes 67 galaxy NGC 67 constellation Hercules 67 supermassive black hole 67 dwarf galaxy 67 Eta Carinae 67 planets 67 Oort Cloud 67 Omega Centauri 67 Proxima Centauri 66 constellation Centaurus 66 planetary nebulae 66 WASP #b 66 Virgo Cluster 66 galaxy M# [002] 66 spiral galaxies 66 Large Magellanic Cloud 66 globular clusters 66 constellation Cassiopeia 65 Virgo cluster 65 protoplanetary disk 65 quasars 65 gaseous planet 65 Fomalhaut b 65 Solar System 65 supernova remnant 65 globulars 65 galaxy clusters 65 starburst galaxy 64 planets orbiting 64 planet orbiting 64 elliptical galaxy 64 supernova explosion 64 Crab Nebula 64 supergiant star 64 Milky Way halo 64 observable universe 64 protostar 64 GRBs 64 Orion nebula 64 Kuiper belt 64 spiral galaxy NGC 64 constellation Sagittarius 64 merging galaxies 64 Oort cloud 64 elliptical galaxies 64 planetary nebula 63 magnetar 63 supermassive 63 supernovae 63 accretion disk 63 Antennae Galaxies 63 potentially habitable planets 63 constellation Carina 63 planet HD #b 63 active galactic nuclei 63 exoplanets 63 AGNs 63 exoplanets planets 63 Wolf Rayet star 63 HD #b [002] 63 sunlike stars 63 rocky planets 63 HD#b 63 galaxy cluster 63 galaxy M# [001] 63 extrasolar planets 63 cluster NGC 63 X ray wavelengths 63 terrestrial planets 63 quasar 63 Earthlike planets 63 constellation Scorpius 63 neutron stars 62 constellation Aquarius 62 red supergiant 62 globular star 62 stellar nurseries 62 exoplanets orbiting 62 Lagoon Nebula 62 Beta Pictoris 62 Epsilon Eridani 62 galactic mergers 62 TrES 4 62 X ray emission 62 constellation Andromeda 62 celestial sphere 62 Carina Nebula 62 fainter objects 62 supernova explosions 62 Small Magellanic Cloud 62 comet nucleus 62 Tarantula Nebula 62 constellation Lyra 62 luminous galaxies 62 star Proxima Centauri 62 planets orbiting sun 62 dwarf galaxies 62 Upsilon Andromedae 62 constellation Taurus 62 transiting planet 61 constellation Leo 61 protoplanetary disks 61 GJ#b 61 constellation Cygnus 61 supernovas 61 BP Psc 61 Eagle Nebula 61 habitable planets 61 Kuiper Belt objects 61 Fermi telescope 61 Rosette Nebula 61 SN #A 61 colliding galaxies 61 Kuiper Belt 61 Coma Cluster 61 innermost planet 61 Kuiper Belt Objects 61 gravitationally bound 61 solar nebula 61 supernova 61 planets orbits 61 eclipsing binary 61 star Gliese 61 exoplanet orbiting 61 galactic disk 61 celestial object 61 magnetars 61 X ray binary 61 giant elliptical galaxy 61 Neutron stars 60 Zeta Ophiuchi 60 astronomical objects 60 comet 60 southern constellation Carina 60 galactic nuclei 60 brown dwarf 60 Henize #-# 60 extrasolar planet 60 constellation Cetus 60 proto galaxies 60 interstellar cloud 60 distant supernovae 60 planet orbits 60 protostars 60 brown dwarfs 60 constellation Eridanus 60 nebulae 60 HM Cancri 60 AU Mic 60 galactic 60 Galilean moons 60 galactic bulge 60 transiting planets 60 exoplanet 60 starburst galaxies 60 arcminutes 60 circumstellar disks 60 RS Ophiuchi 60 Beta Pictoris b 60 cosmological distances 60 Epsilon Aurigae 60 Betelgeuse 59 Supernova #A 59 supernova remnants 59 Trifid Nebula 59 heliosphere 59 Cancri 59 outer planets 59 Trapezium 59 CoRoT #b 59 gamma ray bursts 59 extragalactic 59 Corot 7b 59 exo planets 59 Type Ia supernova 59 extrasolar 59 Kuiper belt objects 59 GRB # 59 intrinsic brightness 59 ULIRGs 59 constellation Aquila 59 Comet Holmes 59 photosphere 59 Red Rectangle 59 KBOs 59 millisecond pulsars 59 GJ #b [001] 59 HD# [002] 59 constellation Aries 59 constellation Perseus 59 pulsar 59 gamma ray burst 59 comets 59 ionized gas 59 star Fomalhaut 59 icy moons 59 Pleiades cluster 59 elliptical galaxy NGC 59 Ring Nebula 59 Cepheid variables 59 Olympus Mons 59 Sagittarius B2 59 globular cluster M# 59 red supergiants 59 Kepler #b 58 Kuiper Belt object 58 GJ #b [002] 58 eccentric orbits 58 Pluto Charon 58 interstellar clouds 58 ejecta 58 Hubble observations 58 Mpc 58 moonlet 58 redshift 58 super Earths 58 emission nebula 58 orbits 58 microquasar 58 planemos 58 sunlike star 58 constellation Orion 58 Arches Cluster 58 constellation Coma Berenices 58 constellation Pegasus 58 blue supergiant 58 AB Aurigae 58 retrograde orbit 58 brightest supernova 58 circumstellar disk 58 Cat Paw Nebula 58 metallicity 58 constellation Ara 58 nebular 58 millisecond pulsar 58 comets orbiting 58 Earth magnetosphere 58 Saturn rings 58 Cygnus Lyra region 58 habitable zones 58 exosolar planets 58 lensing galaxy 58 protoplanet 58 Orion constellation 58 extrasolar planetary systems 58 XTE J# 58 ringed planet 58 SN #gy 57 Dumbbell Nebula 57 ecliptic plane 57 astronomers 57 barred spiral galaxy 57 CoRoT 7b 57 J# +# [002] 57 Type Ia supernovae 57 Earthlike planet 57 hypervelocity stars 57 distant quasar 57 fainter 57 planets moons 57 Cancri e 57 orbiting planets 57 constellation Ophiuchus 57 GQ Lupi 57 X ray telescopes 57 Gliese #e 57 magnetosphere 57 Toutatis 57 GALEX 57 protoplanets 57 interstellar dust 57 asteroid belt 57 extrasolar planets orbiting 57 Gamma ray bursts 57 Bug Nebula 57 outermost planets 57 Cepheids 57 celestial objects 57 Supernovae 57 exoplanetary 57 dust enshrouded 57 Trifid 57 Saturnian system 57 filamentary structure 57 distant quasars 57 Triangulum 57 COROT 57 Bok globules 57 accretion disks 57 Triangulum Galaxy 57 planet WASP #b 57 moonlets 57 Hanny Voorwerp 57 Corot 9b 57 asterism 57 constellation Auriga 57 galactic clusters 57 Alpha Centauri 57 galaxies collide 57 SDSS II 57 chromosphere 57 Bullet Cluster 57 planets orbiting distant 57 Saturn moons 57 foreground galaxy 57 habitable planet 57 Carina constellation 56 constellation Cepheus 56 XMM Newton 56 radial velocity 56 cosmic rays 56 NGC# 56 Tarantula nebula 56 occultations 56 gravitational lenses 56 Helix Nebula 56 P/# A2 56 constellation Libra 56 Hot Jupiters 56 planet Uranus 56 active galactic nucleus 56 earthlike planets 56 Doradus 56 Fomalhaut 56 spiral galaxy Messier 56 Spitzer Space Telescope 56 pulsars 56 cosmic cannibal 56 reflection nebula 56 blazar 56 optical telescopes 56 galactic halo 56 planet Gliese #c 56 redshifted 56 supernovae explosions 56 TrES 56 Gravitational waves 56 gravitationally 56 asteroids orbiting 56 celestial equator 56 interacting galaxies 56 heliopause 56 asteroids comets 56 moon Ganymede 56 V# Mon 56 Fornax cluster 56 moons orbiting 56 redshifts 56 SN #C 56 Puppis 56 HL Tau 56 TNOs 56 proplyds 56 Kuiper belt object 56 mu Arae 56 magnetotail 56 cosmic microwave background 56 Comet Hartley 56 Wolf Rayet stars 56 asteroids 56 jovian 56 Galaxy Evolution 56 TW Hydrae 55 type Ia supernovae 55 protoplanetary 55 circular orbits 55 Cosmic Microwave Background 55 orbiting 55 Geminga 55 Monoceros 55 planetesimals 55 interstellar medium 55 constellation Puppis 55 Gliese #c 55 Comet Hartley 2 55 Enceladus 55 Saturnian moon 55 Cepheus 55 planetary embryos 55 GRB #B 55 solar corona 55 Veil Nebula 55 XO 3b 55 Cygnus X 55 asteroidal 55 Kepler 9c 55 Sedna 55 Earth radii 55 Earths orbiting 55 impactors 55 gamma rays 55 Comet Elenin 55 Syrtis Major 55 Gliese #d 55 spiral galaxy M# 55 interstellar dust clouds 55 circumstellar 55 gamma ray observatory 55 permanently shadowed craters 55 blue straggler 55 gravitational waves 55 ecliptic 55 X ray observatory 55 infrared wavelengths 55 inhabitable planets 55 suns 55 VY Canis Majoris 55 constellation Vulpecula 55 gamma ray emission 55 universe 55 icy comets 55 interstellar dust grains 55 planets comets 55 BP Piscium 55 Pleiades star 55 SN#A 55 Butterfly Nebula 55 Comet Lulin 55 Andromeda Galaxy M# 55 type Ia supernova 55 Andromeda 55 spacetime 55 planetoid 55 Venusian atmosphere 55 KH #D 55 Earth asteroids 55 gaseous planets 55 Perseus Cluster 55 Hipparcos 55 nebula NGC 55 NGC #A 55 hot Jupiters 55 star Spica 55 torus 55 moon Io 55 noctilucent clouds 55 zodiacal dust 54 Globular clusters 54 Magnetars 54 comets asteroids 54 Crab Pulsar 54 solar radii 54 elongated orbits 54 RY Sagittarii 54 Quaoar 54 planets astronomers 54 constellation Canis Major 54 Upsilon Andromedae b 54 trans Neptunian objects 54 double helix nebula 54 gravitational microlensing 54 inner asteroid belt 54 Cepheid variable 54 lunar crust 54 SIRTF 54 planets circling 54 giant elliptical galaxies 54 Canis Major 54 blazars 54 submillimeter galaxies 54 rotational axis 54 Stephan Quintet 54 Serpens 54 ionized hydrogen 54 silicate dust 54 moon Enceladus 54 X ray observatories 54 exoplanets planets outside 54 nebulosity 54 galaxy Andromeda 54 planets Uranus 54 zodiacal light 54 Mimas 54 moon Charon 54 constellation Bootes 54 PSR J# 54 galactic cores 54 CoRoT satellite 54 GeV 54 Saturn moon Enceladus 54 galaxy formation 54 spherical halo 54 Carinae 54 Beehive Cluster 54 Saturn magnetosphere 54 orbits Saturn 54 supernovae explode 54 HAT P 54 spectroscopic observations 54 constellation Draco 54 Comet Halley 54 Valles Marineris 54 meteoroids 54 arcseconds 54 Comet Tempel 1 54 Pinwheel Galaxy 53 Evolution Explorer 53 elliptical orbits 53 reionization 53 dense clumps 53 Type 1a supernovae 53 Exoplanets 53 constellation Gemini 53 Astronomers 53 cosmos 53 Kuiper Belt Object 53 gravitational interactions 53 proto cluster 53 galactic cosmic rays 53 exo planet 53 perihelion 53 chondrules 53 eclipsing binaries 53 moon Mimas 53 Super Earths 53 Magellanic Clouds 53 protoplanetary discs 53 heavily cratered 53 moons 53 Scorpius 53 star Beta Pictoris 53 exosphere 53 superdense neutron star 53 habitable worlds 53 planet HD#b 53 asteroid 53 G#.# +#.# 53 smallest exoplanet 53 Galilean satellites 53 optical wavelengths 53 dynamical evolution 53 slender crescent 53 ultraviolet wavelengths 53 Comet Hale Bopp 53 Saturnian 53 celestial bodies 53 Eridani 53 proto planetary disk 53 galaxy redshift 53 Galaxies 53 Gliese #g 53 HiRISE image 53 gamma ray flares 53 Orionids 53 zodiac constellations 53 Comet McNaught 53 baryons 53 afterglows 53 CoRoT 9b 53 mesosphere 53 #P/Churyumov-Gerasimenko 53 HD #b [001] 53 Wolszczan 53 RS Oph 53 heliosheath 53 X ray Observatory 53 Churyumov Gerasimenko 53 constellations Cygnus 53 Pluto Eris 53 constellation Monoceros 53 neutralinos 53 Hale Bopp 53 Helix nebula 53 outer corona 53 Jovian moons 53 Canes Venatici 53 astrophysical 53 quark gluon plasma 53 Spiral galaxies 53 cometary material 53 Goldilocks planet 53 infall 53 supercontinent 53 magnetospheric 53 dwarf spheroidal 53 GRB# 53 luminosities 53 polar vortex 53 X ray pulses 53 coronal mass ejections CMEs 53 ESO PR 53 Iapetus 52 interstellar dust particles 52 waning crescent moon 52 microlensing events 52 unaided eye 52 intracluster 52 comet Lulin 52 Coma cluster 52 transiting exoplanet 52 astrophysical objects 52 Saturnian moons 52 circumstellar dust 52 Sombrero Galaxy 52 Solar TErrestrial RElations Observatory 52 PSR B# +# 52 Galactic cosmic rays 52 Cosmic Evolution 52 Martian meteorites 52 chemical abundances 52 Saturn Cassini 52 Comet Machholz 52 gravitational lensing 52 Horsehead Nebula 52 MG J# +# 52 Pleiades 52 Comet #P/Churyumov-Gerasimenko 52 CoRoT 52 HIRES spectrometer 52 gravitational tides 52 neighboring Andromeda galaxy 52 Capricornus 52 Mandushev 52 Type Ia supernovas 52 planetoids 52 spherically symmetric 52 Great Observatories 52 gravity warps 52 visible wavelengths 52 WIMPs 52 SMBH 52 Type Ia 52 baryon 52 planet 52 ESO VLT 52 dirty snowballs 52 Ulysses spacecraft 52 asteroid Vesta 52 sized planets orbiting 52 IRAS #-# 52 brightnesses 52 retrograde orbits 52 Earthlike 52 submillimetre wavelengths 52 Jupiter magnetosphere 52 Comet Tempel Tuttle 52 earthshine 52 Trojan asteroids 52 Hellas Basin 52 Globular Cluster 52 Geminids 52 NASA Chandra 52 neutrino 52 comet McNaught 52 high redshift galaxies 52 nucleosynthesis 52 polarimetry 52 WM Keck Observatory 52 substorms 52 binary asteroid 52 corona 52 HIP #b 52 Caloris 52 Voorwerp 52 Caloris Basin 51 moon Titan 51 helium atoms 51 parsecs 51 constellation Serpens 51 V# Sgr 51 Astronomical Units 51 starlight 51 Valles Marineris canyon 51 gravitational interaction 51 ultraluminous galaxy 51 supermassive stars 51 spiral nebulae 51 accreting 51 Shackleton crater 51 Eridanus 51 atomic nucleus 51 Herschel telescope 51 HII regions 51 waxing crescent moon 51 Ursa Minor 51 coronal mass ejections 51 habitable zone 51 faint galaxies 51 AUs 51 galactic collisions 51 moons Phobos 51 Corona Borealis 51 VISTA telescope 51 Astrophysics Cambridge Mass. 51 X ray emitting 51 Goldilocks zone 51 zodiacal constellations 51 planets circling stars 51 dusty disks 51 Kepler telescope 51 RQ# 51 atomic nuclei 51 RXTE 51 HUDF 51 mantle plumes 51 ray Space Telescope 51 periodic dimming 51 Astrophysicists 51 Wilkinson Microwave Probe 51 relativistic jets 51 Earth ionosphere 51 Mauna Kea Hawaii 51 comet Hale Bopp 51 interstellar space 51 Quadrantids 51 spinning neutron 51 Jupiter moon Io 51 magnetic reconnection 51 aphelion 51 SN #D 51 ejecta blanket 51 Uranus 51 Delta Cephei 51 Neil Gehrels 51 comet Tempel Tuttle 51 Orionid 51 Jupiter Saturn 51 Gondolo 51 BLG #L 51 baryonic matter 51 planet Gliese #g 51 cometary debris 51 ULP cepheids 51 Gliese 51 UDFy # 51 SNe Ia 51 radial velocities 51 Camelopardalis 51 constellation 51 Keck Interferometer 51 interstellar boundary 51 runaway thermonuclear 51 filamentary structures 51 galaxy NGC# 51 X ray binaries 51 infalling gas 51 Astrophysical 51 Apophis asteroid 51 Hyades cluster 51 cometary 51 supercontinent Pangaea 51 infrared telescopes 51 SEGUE 51 waxing gibbous moon 51 occulted 51 astrophysical phenomena 51 arcsecond 51 gravitational attraction 51 spherules 51 SMBHs 51 distant suns 51 NEAs 51 VLTI 51 coronal loop 50 galactic magnetic 50 kpc 50 Leonids 50 nuclei 50 ellipse 50 axions 50 outermost planet 50 Earths 50 Halley comet 50 highly magnetized neutron 50 gravitational lens 50 umbral shadow 50 novae 50 Halley Comet 50 Epimetheus 50 Omega Nebula 50 Saturn outermost 50 gibbous 50 crystalline silicates 50 SINFONI 50 exoplanetary systems 50 Galileo spacecraft 50 Martian equator 50 comet Tempel 1 50 THEMIS satellites 50 Gemini constellation 50 supernova SN 50 Supermassive black 50 Swift Tuttle 50 Io Europa 50 planetary 50 Itokawa 50 tidal bulge 50 VB #b 50 planet TrES 50 Comet NEAT 50 Ophiuchi 50 protoplanetary disc 50 supergiant stars 50 distant supernovas 50 Cosmic rays 50 Pinwheel galaxy 50 aurorae 50 planetarium dome 50 Adam Riess 50 neutrinos 50 Muchachos Observatory 50 EPOXI 50 Gamma rays 50 lunar perigee 50 volcanic moon Io 50 Perseids 50 Arabia Terra 50 permanently shadowed 50 planet magnetosphere 50 occultation 50 Quadrantid meteor shower 50 Dwarf galaxies 50 z ~ 50 Hubble Ultra 50 CMB radiation 50 interstellar particles 50 Gravitational lensing 50 coronal loops 50 Jovian moon 50 Samuel Oschin Telescope 50 Endeavour Crater 50 relativistic particles 50 Voyager spacecraft 50 transiting exoplanets 50 Exoplanet 50 infrared telescope 50 New Horizons spacecraft 50 Wilkinson Microwave Anisotropy Probe 50 comet orbit 50 hypernova 50 lunar craters 50 radial velocity technique 50 distant galaxy clusters 50 Serpens Cauda 50 Active Galactic Nuclei 50 detect gravitational waves 50 meteoritic material 50 lightwaves 50 proto planetary disks 50 CMB photons 50 rotating neutron 50 stellar occultations 50 Planck satellite 50 solar flares 50 planets asteroids 50 SN #E 50 Very Large Array 50 largest moon Charon 50 planetary Transits 49 Chi Cygni 49 telescopes 49 antimatter particles 49 Arcturus 49 VLBA 49 baryonic 49 Cassini flyby 49 COROT 7b 49 spectroscopic measurements 49 GRB #A 49 Extrasolar planets 49 interstellar molecules 49 constellations 49 comet #P/Churyumov-Gerasimenko 49 starlike object 49 astrophysicists 49 Earth 49 Lulin 49 masers 49 airglow 49 QQ# 49 WMAP satellite 49 impactor spacecraft 49 cosmic microwave radiation 49 equator 49 ESA XMM Newton 49 energetic electrons 49 R#a# 49 superclusters 49 T Tauri 49 highly elliptical orbits 49 infalling 49 cosmic ray 49 SNR #-#.# 49 constellation Hydra 49 auroral 49 basaltic rocks 49 silicate mantle 49 constellation Pisces 49 Aurigae 49 heliospheric 49 Konacki 49 CMEs 49 IRC +# 49 La Silla Chile 49 Saturn moon 49 orbital resonance 49 sun corona 49 Candor Chasma 49 constellation Fornax 49 magma ocean 49 Gusev crater 49 RRATs 49 constellation Canes Venatici 49 moon Phobos 49 Maunder minimum 49 cosmic ray particles 49 astrometry 49 SDSS 49 impactor 49 spectroscopically 49 BLG #Lb 49 Orientale Basin 49 cosmic phenomena 49 submillimeter wavelengths 49 gravitational radiation 49 tholins 49 electron neutrinos 49 substorm 49 calderas 49 WISE spacecraft 49 ESO Very Large Telescope 49 faintest galaxies 49 coronagraph 49 rotating neutron stars 49 Planck telescope 49 wrinkle ridges 49 crescent Moon 49 phyllosilicates 49 Lyman alpha 49 meteoroid 49 Saturn Uranus 49 submillimeter 49 spaceweather.com 49 gamma ray emitting 49 RX J# 49 arcsec 49 planetary transits 49 OGLE TR #b 49 gravitational tugs 49 planetary orbits 49 planetary nebulas 49 telescopes astronomers 49 Quadrantid 49 Sagittarius dwarf galaxy 49 outer layers 49 infrared wavelength 49 Neptune Uranus 49 nicknamed Xena 49 magnetic fields 49 optical telescope 49 aperture telescope 49 redshift z = 49 hexagonal mirrors 49 Planetary nebulae 49 Coma Berenices 49 Epsilon Indi 49 undersea volcanoes 49 unmanned probes 49 plutoids 49 Endurance crater 49 elongated orbit 49 OGLE TR 49 Scorpii 49 Saturn auroras 49 faraway galaxies 49 Arsia Mons 49 Pegasi 49 cosmological theories 49 comet dust 49 Kepler spacecraft 48 supernova remnant Cassiopeia 48 ESA Integral 48 thermonuclear reactions 48 Tau Ceti 48 binary quasar 48 chondrites 48 planet transits 48 spatially resolved 48 galaxy supermassive black 48 supergiant 48 nebulas 48 Giovanni Cassini