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(Click for frequent words.) 76 exoplanets 76 rocky planets 76 planets orbiting 75 galaxies 75 extrasolar planets 74 habitable planets 73 comets 72 galaxy 72 terrestrial planets 71 Earthlike planets 70 celestial bodies 70 extrasolar 70 Milky Way galaxy 70 supernovae 69 asteroids 69 super Earths 69 planets orbiting stars 68 KBOs 68 planetary 68 Solar System 68 exoplanets orbiting 68 brown dwarfs 68 globular clusters 68 supernovas 68 planets orbits 67 exoplanet 67 distant galaxies 67 moons 67 Milky Way Galaxy 66 hot Jupiters 66 outer planets 66 Milky Way 66 planets orbiting distant 66 quasars 66 elliptical galaxies 66 Orion Nebula 66 transiting planets 66 dwarf galaxies 66 planetary nebulae 65 icy moons 65 habitable zones 65 Andromeda galaxy 65 Upsilon Andromedae 65 orbits 65 planemos 65 potentially habitable planets 65 distant galaxy 65 planets moons 65 Kuiper Belt Objects 65 Earths 65 spiral galaxies 65 supernova explosion 65 Epsilon Eridani 65 galaxy clusters 65 comet 64 habitable planet 64 WASP #b 64 nebulae 64 GRBs 64 moons orbiting 64 Saturn moons 64 Kuiper Belt 64 Uranus 64 protoplanetary disks 64 sunlike stars 64 Kuiper belt objects 64 astronomers 64 HD #b [002] 64 planetoids 64 extrasolar planet 64 protoplanetary disk 64 merging galaxies 63 planet orbiting 63 supernova 63 neutron star 63 comets asteroids 63 habitable worlds 63 planet 63 supermassive black holes 63 earthlike planets 63 gaseous planet 63 extrasolar planetary systems 63 Kuiper belt 63 circumstellar disks 63 neutron stars 63 Andromeda Galaxy 63 brown dwarf 63 planets orbiting sun 63 gravitationally bound 63 BP Psc 63 cosmos 62 astronomical objects 62 Beta Pictoris b 62 exoplanetary 62 pulsars 62 universe 62 millisecond pulsars 62 Enceladus 62 Galilean moons 62 Saturn rings 62 red supergiants 62 Earthlike planet 62 planet orbits 62 planet Uranus 61 nebula 61 supernova explosions 61 inhabitable planets 61 transiting planet 61 asteroid 61 X ray binary 61 exosolar planets 61 globular cluster 61 supermassive 61 magnetar 61 Earthlike 61 Oort cloud 61 protostars 61 solar nebula 61 protoplanets 61 innermost planet 61 Corot 7b 61 extrasolar planets orbiting 61 magnetars 61 exo planets 61 proplyds 60 gaseous planets 60 GJ #b [001] 60 galaxy cluster 60 interstellar cloud 60 gamma ray bursts 60 distant supernovae 60 comets orbiting 60 galactic 60 Beta Pictoris 60 dwarf galaxy 60 Gliese #d 60 Jovian moons 60 Earth asteroids 60 AGNs 60 active galactic nuclei 60 Kuiper Belt object 60 eccentric orbits 60 planetoid 60 protoplanet 60 asteroid belt 60 HD#b 60 Wolszczan 60 Gliese #g 60 radial velocity 60 stellar nurseries 60 planets comets 60 red supergiant 60 protostar 60 quasar 60 icy comets 60 starburst galaxies 60 distant quasars 60 circular orbits 60 globulars 60 Fomalhaut b 60 observable universe 59 Pluto 59 habitable zone 59 Gliese #c 59 planetesimals 59 interstellar clouds 59 Alpha Centauri 59 Pluto Charon 59 elliptical orbits 59 elongated orbits 59 planets astronomers 59 galaxy formation 59 celestial objects 59 luminous galaxies 59 CoRoT #b 59 CoRoT 9b 59 colliding galaxies 59 planet HD #b 59 Gravitational waves 59 supermassive black hole 59 planetary orbits 59 asteroids comets 59 Astronomers 59 nebular 59 exo planet 59 supernovae explosions 59 Antennae Galaxies 59 SN #gy 59 Kepler #b 59 retrograde orbits 59 planetary nebula 59 Planets 59 proto planetary disks 58 dirty snowballs 58 Oort Cloud 58 asteroidal 58 plutoids 58 celestial object 58 axions 58 Hot Jupiters 58 WIMPs 58 Kuiper Belt objects 58 Omega Centauri 58 moon Charon 58 proto galaxies 58 Earths orbiting 58 GJ#b 58 planets circling stars 58 orbiting planets 58 exoplanets planets 58 galactic mergers 58 pulsar 58 cosmic 58 Eta Carinae 58 potentially habitable 58 phyllosilicates 58 orbiting 58 Sedna 58 Pluto Eris 58 sunlike star 58 accretion disks 58 CoRoT 7b 58 Earth 58 planets circling 58 AU Mic 58 astrophysical 58 solar corona 58 galaxies collide 58 Neptune Uranus 58 highly elliptical orbits 58 millisecond pulsar 57 Jupiter Saturn 57 binary asteroid 57 constellations 57 accretion disk 57 cosmological distances 57 Galilean satellites 57 Neutron stars 57 Cancri e 57 ringed planet 57 Wolf Rayet stars 57 permanently shadowed craters 57 neutrinos 57 circumstellar 57 interstellar space 57 HM Cancri 57 atoms 57 gravitational interactions 57 sized planets orbiting 57 eclipsing binaries 57 aurorae 57 cosmic phenomena 57 X ray telescopes 57 Henize #-# 57 Saturn moon 57 hydrostatic equilibrium 57 novae 57 COROT 57 AB Aurigae 57 star Gliese 57 supernova remnants 57 planetary embryos 57 gravitational waves 57 Super Earths 57 gravitational microlensing 57 Proxima Centauri 57 planet transits 57 interstellar medium 57 comet nucleus 57 Cepheids 57 extragalactic 56 Red Rectangle 56 trans Neptunian objects 56 HL Tau 56 Kepler 9c 56 occultations 56 Wolf Rayet star 56 planet Gliese #g 56 dynamical evolution 56 Saturn Cassini 56 coronal loops 56 Galaxies 56 planets Uranus 56 gravitational lenses 56 SN #A 56 X ray wavelengths 56 exoplanet orbiting 56 gravitationally 56 protoplanetary discs 56 intrinsic brightness 56 planets asteroids 56 meteoroids 56 retrograde orbit 56 fainter objects 56 Zeta Ophiuchi 56 neutrino 56 supersymmetric particles 56 photosphere 56 Milky Way halo 56 Corot 9b 56 elliptical galaxy 56 interstellar dust clouds 56 celestial sphere 56 spiral galaxy 56 Exoplanets 56 constellation Hercules 56 proto planetary disk 56 interstellar dust 56 globular star 56 Trojan asteroids 56 metallicity 56 galactic clusters 56 neutralinos 56 Kuiper belt object 56 astrophysical phenomena 56 galactic cores 56 lunar crust 56 planet WASP #b 56 suns 56 solar flares 56 Higgs bosons 55 chemical abundances 55 lunar craters 55 exoplanets planets outside 55 Astrophysicists 55 Upsilon Andromedae b 55 heliosphere 55 lensing galaxy 55 ULIRGs 55 constellation Virgo 55 masers 55 X ray emission 55 moonlets 55 earths 55 Mandushev 55 radial velocity technique 55 X ray binaries 55 Toutatis 55 galaxy M# [001] 55 cosmic rays 55 smallest exoplanet 55 constellation Ursa Major 55 outermost planets 55 gamma ray burst 55 Mars 55 Type Ia supernovae 55 hypervelocity stars 55 gravitational interaction 55 quark gluon plasma 55 supergiant star 55 Extrasolar planets 55 chondrules 55 organic molecules 55 Cepheid variables 55 Crab Nebula 55 jovian 55 constellation Cassiopeia 55 moon Europa 55 Carina constellation 55 Orion nebula 55 magnetosphere 55 reionization 55 mu Arae 55 galaxy M# [002] 55 Jupiter moons 55 Supernovae 55 eclipsing binary 55 starburst galaxy 55 circumstellar disk 55 sunspots 55 meteorites 55 spacetime 55 gravitational perturbations 55 Spitzer Space Telescope 55 astrophysical objects 54 type Ia supernovae 54 redshifts 54 GJ #b [002] 54 dwarf planets 54 galactic disk 54 distant suns 54 nucleosynthesis 54 HD# [002] 54 asteroid Vesta 54 moons circling 54 periodic dimming 54 extrasolar worlds 54 infalling 54 planet HD#b 54 Jupiter Saturn Uranus 54 ultraviolet wavelengths 54 alien civilizations 54 filamentary structure 54 planetary nebulas 54 VY Canis Majoris 54 spatial dimensions 54 Goldilocks planet 54 Hubble observations 54 VB #b 54 Saturn magnetosphere 54 Venusian atmosphere 54 TrES 4 54 noctilucent clouds 54 OGLE TR #b 54 galactic cosmic rays 54 Kuiper Belt Object 54 moons Phobos 54 Bok globules 54 CoRoT satellite 54 intracluster 54 CoRoT 54 gravitational pulls 54 Magnetars 54 moon Io 54 magma ocean 54 KH #D 54 gravitational tides 54 moon Enceladus 54 moon Ganymede 54 Cancri 54 Higgs particle 54 Epsilon Aurigae 54 asteroids orbiting 54 Evolution Explorer 54 cometary 54 galactic collisions 54 astrobiologists 54 NASA Kepler spacecraft 54 antimatter particles 54 interstellar 54 SN#A 54 astrophysicists 54 baryons 54 Mimas 53 BP Piscium 53 Churyumov Gerasimenko 53 celestial 53 magnetic fields 53 NASA Kepler 53 Type Ia supernovas 53 hydrated minerals 53 Fomalhaut 53 interstellar dust grains 53 redshift 53 substorms 53 Maunder minimum 53 Fermi telescope 53 Konacki 53 Magellanic Clouds 53 Comet Holmes 53 exosphere 53 Trapezium 53 MG J# +# 53 XMM Newton 53 GQ Lupi 53 Saturnian moons 53 Betelgeuse 53 planetary transits 53 Earth magnetosphere 53 cosmic cannibal 53 biosignatures 53 Uranus Neptune 53 Martian surface 53 gravitational lensing 53 Gliese #e 53 giant gaseous planets 53 Universe 53 Red Planet 53 Large Magellanic Cloud 53 Eagle Nebula 53 detect gravitational waves 53 HD #b [001] 53 Type 1a supernovae 53 NEAs 53 impactors 53 Rosette Nebula 53 Gamma ray bursts 53 blue supergiant 53 meteor impacts 53 Gliese 53 protoplanetary 53 Arches Cluster 53 Exoplanet 53 nebulas 53 Ring Nebula 53 Pleiades cluster 53 planetary alignments 53 Kepler 9b 53 Hale Bopp 53 Jupiter moon Io 53 fainter 53 Hanny Voorwerp 53 prebiotic molecules 52 submillimeter galaxies 52 Globular clusters 52 Saturnian moon 52 Pleiades star 52 ionized hydrogen 52 blazars 52 magnetospheres 52 cosmologists 52 coronal mass ejections 52 Alfven waves 52 constellation Sagittarius 52 P/# A2 52 star Proxima Centauri 52 gravitational attraction 52 cluster NGC 52 microlensing events 52 R Coronae Borealis 52 Quaoar 52 baryon 52 chromosphere 52 Venusian 52 ejecta 52 magnetospheric 52 Martian meteorites 52 reflection nebula 52 silicate dust 52 cosmological theories 52 constellation Taurus 52 transiting exoplanet 52 Kepler 52 exoplanetary systems 52 Type Ia supernova 52 hydrogen atoms 52 Helix Nebula 52 Coma Cluster 52 constellation Aquarius 52 Orion constellation 52 astrometry 52 XTE J# 52 planetary atmospheres 52 supernovae explode 52 earthlike 52 Perseus Cluster 52 subsurface ocean 52 zodiac constellations 52 astronomical phenomena 52 geostationary orbits 52 planets atmospheres 52 constellation Cygnus 52 Jovian moon 52 planet Gliese #c 52 Martian 52 microlensing 52 sterile neutrino 52 Goldilocks zone 52 planetesimal 52 subatomic particles 52 Comet Machholz 52 dusty disks 52 interacting galaxies 52 chondrites 52 planet TrES 52 galactic nuclei 52 galactic halo 52 Cosmic rays 52 perihelion 52 magnetic reconnection 52 auroras 52 Cassini flyby 52 TrES 52 supermassive stars 52 galaxy NGC 52 CMEs 52 magnetic monopoles 52 distant galaxy clusters 52 supernova remnant 52 constellation Cetus 52 constellation Carina 52 gravitational tugs 52 lunar surface 52 infrared wavelengths 52 Saturn moon Enceladus 51 Smithsonian astronomer 51 binary asteroids 51 moonlet 51 brightest supernova 51 Planetary nebulae 51 Kepler discoveries 51 Sagittarius dwarf galaxy 51 nuclei 51 X ray observatories 51 constellation Centaurus 51 asteroseismology 51 Uranian 51 V# Sgr 51 dense clumps 51 spiral nebulae 51 energetic cosmic rays 51 meteors 51 coronal mass ejections CMEs 51 IRAS #-# 51 planet magnetosphere 51 assumed planets circling 51 asteroid Ceres 51 Carina Nebula 51 COROT 7b 51 martian 51 Saturnian moon Titan 51 magnetotail 51 spherically symmetric 51 Jupiter Uranus 51 IRC +# 51 Bug Nebula 51 Sasselov 51 high redshift galaxies 51 interstellar molecules 51 infrared telescopes 51 hydrogen helium 51 asterism 51 Triangulum 51 dimming starlight 51 dust enshrouded 51 SMBHs 51 cosmological 51 gamma rays 51 constellation Leo 51 S/# P2 51 constellation Pegasus 51 Puppis 51 faraway galaxies 51 Jupiter gravitational pull 51 ultracold atoms 51 Saturn Enceladus 51 OGLE TR 51 Quadrantids 51 celestial phenomena 51 Cosmic Microwave Background 51 astronomical observations 51 XO 3b 51 lifeforms 51 cosmic collisions 51 baryonic matter 51 unmanned probes 51 outermost planet 51 faintest galaxies 51 RS Ophiuchi 51 Small Magellanic Cloud 51 orbital resonance 51 extraterrestrial civilizations 51 infall 51 Olympus Mons 51 J# +# [002] 51 faint galaxies 51 Spiral galaxies 51 gamma ray emission 51 Lagoon Nebula 51 Elliptical galaxies 51 spherical halo 51 Fornax cluster 51 ecliptic plane 51 stellar occultations 51 cometary debris 51 neutrons 51 TW Hydrae 51 Haumea 51 silicon monoxide 51 Cassini 51 baryonic 51 antineutrinos 51 telescopic observations 51 Coma cluster 51 GALEX 51 SIRTF 51 Comet Hartley 2 51 Nibiru 51 plutoid 51 elliptical orbit 51 Comet Elenin 51 Jupiter icy moons 51 Saturn Uranus 51 gravitational wobbles 51 transiting exoplanets 51 Solar TErrestrial RElations Observatory 51 Comet Hartley 51 blue straggler 51 primordial ingredients 51 atomic nuclei 51 Pluto moon Charon 51 radial velocity method 50 Galaxy Evolution 50 ultraluminous galaxy 50 TNOs 50 SIM PlanetQuest 50 cosmic ray 50 Martian atmosphere 50 AUs 50 telescopes astronomers 50 Martian craters 50 atomic particles 50 Cygnus Lyra region 50 atomic nucleus 50 tholins 50 Virgo Cluster 50 carbonate minerals 50 cosmic microwave background 50 constellation Ophiuchus 50 Cosmologists 50 BLG #Lb 50 polar caps 50 electron neutrinos 50 Cat Paw Nebula 50 Voyager spacecraft 50 Asteroids 50 gravitational 50 moon Mab 50 STEREO spacecraft 50 subatomic particle 50 moon Titan 50 occulted 50 X ray observatory 50 rotational axis 50 dwarf spheroidal galaxies 50 heavily cratered 50 galactic magnetic 50 planetary Transits 50 general relativity 50 Supernova #A 50 Halley comet 50 faraway galaxy 50 type Ia supernova 50 protoplanetary disc 50 Jupiter Ganymede 50 HAT P 50 planetary surfaces 50 cometary impacts 50 astronomer 50 Kepler Telescope 50 moon Mimas 50 Asteroid Belt 50 Type Ia 50 GRB #B 50 constellation Perseus 50 supergiant stars 50 Virgo cluster 50 interstellar grains 50 Pleiades 50 WMAP 50 dwarf spheroidal 50 barred spiral galaxy 50 RRATs 50 Muons 50 extrasolar planetary 50 supersymmetric 50 prograde 50 Kepler spacecraft 50 Delta Cephei 50 Comet Lulin 50 Io Europa 50 #P/Churyumov-Gerasimenko 50 Helix nebula 50 globular cluster M# 50 microquasar 50 Andromeda 50 spiral galaxy Messier 50 planets constellations 50 Microlensing 50 carbonaceous chondrites 50 Orionid 50 R#a# 50 G#.# +#.# 50 meteorite impacts 50 distant quasar 50 Stephan Quintet 50 SDSS II 50 Earth radii 50 accreting 50 primitive meteorites 50 abundances 50 antiparticles 50 IntergalaticEarth 50 radioactive nuclei 50 neutralino 50 Phobos 50 luminosities 50 dwarf planet 50 Geminga 50 lobate scarps 50 Ulysses spacecraft 50 spectroscopic measurements 50 Cepheid variable 50 ULP cepheids 50 BLG #L 50 inner asteroid belt 50 gamma ray emitting 50 lunar orbits 50 sodium atoms 50 Planck 50 COROT exo 3b 50 Iapetus 50 supercontinents 50 Pluto demotion 50 blazar 50 waxing gibbous moon 50 zodiacal constellations 49 Orionids 49 neutrino particles 49 galactic bulge 49 Tarantula Nebula 49 Comet Tempel Tuttle 49 Tau Ceti 49 highly elliptical orbit 49 Gravitational lensing 49 substorm 49 antiparticle 49 UDFy # 49 largest moon Charon 49 NASA Cassini spacecraft 49 GZK cutoff 49 nucleon 49 spectroscopic observations 49 universes 49 Bullet Cluster 49 giant elliptical galaxy 49 Mojzsis 49 galactic alignment 49 antimatter 49 permanently shadowed 49 planetary astronomy 49 dust devils 49 carbonaceous chondrite 49 wavefunction 49 unaided eye 49 elongated orbit 49 outer corona 49 Martian crater 49 Astrophysics Cambridge Mass. 49 radial velocities 49 stellar seismology 49 spectroscopically 49 Saturn Jupiter Uranus 49 SUSY 49 Higgs boson particle 49 X ray emitting 49 axis wobbles 49 Pulsars 49 spatially resolved 49 auroral 49 Nasa spacecraft 49 HIP #b 49 brightnesses 49 active galactic nucleus 49 zodiacal light 49 comet Hale Bopp 49 cosmic microwave radiation 49 constellation Orion 49 galaxies nebulae 49 distant supernovas 49 gravitational radiation 49 novas 49 gamma ray observatory 49 supersymmetry 49 equator 49 hematite mineral 49 Kepler Mission 49 spiral galaxy NGC 49 Meridiani 49 Comet #P/Churyumov-Gerasimenko 49 starbursts 49 Pegasi 49 spacecraft flyby 49 constellation Lyra 49 silicates 49 Saturnian system 49 Eridani 49 ionized gas 49 Saturn aurora 49 Sagittarius B2 49 HII regions 49 supergiants 49 polar craters 49 SMBH 49 comet Lulin 49 God Particle 49 superfluid 49 lunar poles 49 star Beta Pictoris 49 optical telescopes 49 meteoritic material 49 axial tilt 49 astrobiological 49 albedo reflectivity 49 gaseous envelope 49 muons 49 Grillmair 49 Late Heavy Bombardment 49 magnetic polarity 49 Seyfert galaxies 49 Geminids 49 star Spica 49 abiogenesis 49 spinning neutron stars 49 cometary material 49 supercontinent 49 blackholes 49 vortices 49 Mars Uranus 49 NASA Chandra 49 spherules 49 moons orbiting Saturn 49 Agol 49 orbital 49 cosmological models 49 tidally locked 49 Gemini constellation 49 tau neutrinos 49 mantle plumes 49 telescopes 49 star Fomalhaut 49 gravitational tug 49 Diviner 49 Charon Pluto 48 ecliptic 48 moon 48 Wilkinson Microwave Anisotropy Probe 48 spiral galaxy M# 48 subatomic 48 constellation Eridanus 48 Methone 48 heliopause 48 Einstein relativity theory 48 orbited Jupiter 48 gravitational lens 48 SDSS 48 extrasolar planet HD #b 48 electroweak 48 meteoroid impacts 48 Comet Halley 48 NASA Fermi Gamma 48 Saturnian 48 comet orbit 48 slender crescent 48 solar radii 48 planet gravitational tug 48 shadowy craters 48 orbiting Hubble Space Telescope 48 particle acceleration 48 gamma ray photons 48 missing baryons 48 neighboring Andromeda galaxy 48 Einstein theory 48 comets moons 48 NASA Kepler telescope 48 Alfvén waves 48 moonquakes 48 auroral displays 48 comet nuclei 48 Venus transits 48 outer space 48 Supermassive black 48 Hipparchus 48 colliding asteroids 48 comet Tempel 1 48 V# Mon 48 relativistic jets 48 solar minima 48 moons JAXA 48 sterile neutrinos 48 nicknamed Xena 48 constellation Andromeda 48 interstellar dust particles 48 Meteorites 48 Halley Comet 48 Pieter van Dokkum 48 robotic rovers 48 hadrons 48 optical wavelengths 48 mysterious uncharted 48 corona 48 extraterrestrial 48 rotating neutron stars 48 polarimetry 48 moons Io 48 stony meteorites 48 inner moons 48 ray Space Telescope 48 demote Pluto 48 APXS 48 intelligent beings 48 superstrings 48 NEOs 48 gamma ray flares 48 MESSENGER 48 epicycles 48 SN #C 48 occultation 48 Herbig Ae Be 48 NASA rovers 48 X ray Observatory 48 NASA rovers Spirit 48 oblate spheroid 48 lunar meteorites 48 faraway planets 48 comet Tempel Tuttle 48 nucleobases 48 Quarks 48 filaments