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(Click for frequent words.) 77 Earthlike planets 75 rocky planets 74 planets 74 terrestrial planets 72 habitable worlds 71 planets orbiting distant 71 planets orbiting 70 extrasolar planets 70 Earthlike planet 69 exoplanets 69 habitable zones 69 extrasolar 68 super Earths 68 potentially habitable planets 67 planets orbiting stars 67 brown dwarfs 67 habitable planet 66 transiting planets 66 exoplanet 66 astronomical objects 66 exoplanets orbiting 65 GRBs 65 inhabitable planets 65 planetary nebulae 65 sunlike stars 65 Earths orbiting 65 globular clusters 64 Epsilon Eridani 64 extrasolar planet 64 extrasolar planetary systems 64 earthlike planets 64 planets orbiting sun 64 Gliese #c 63 Earthlike 63 habitable zone 63 quasars 63 KBOs 63 Wolszczan 63 X ray wavelengths 63 Kuiper Belt Objects 63 axions 63 Higgs particle 63 icy moons 62 Milky Way galaxy 62 WASP #b 62 transiting planet 62 extrasolar planets orbiting 62 gravitational microlensing 62 asteroids comets 62 exoplanetary 62 planet Gliese #g 62 planets astronomers 61 planets circling 61 exo planets 61 supernovae 61 Kuiper belt objects 61 Gliese #d 61 luminous galaxies 61 Milky Way Galaxy 61 galaxies 61 GJ #b [001] 61 X ray binary 61 distant supernovae 61 Earth asteroids 61 planemos 61 potentially habitable 61 comets asteroids 61 supersymmetric particles 61 astrobiologists 61 moons orbiting 61 stellar nurseries 61 BP Psc 61 Gliese #g 60 gravitationally bound 60 globular cluster 60 permanently shadowed craters 60 merging galaxies 60 smallest exoplanet 60 Kepler #b 60 biosignatures 60 Beta Pictoris b 60 HD #b [002] 60 Upsilon Andromedae 60 planets circling stars 60 magnetars 60 nebulae 60 Corot 7b 60 planetary 60 distant galaxies 59 magnetar 59 Corot 9b 59 gaseous planets 59 Higgs bosons 59 interstellar dust clouds 59 sized planets orbiting 59 moon Europa 59 elliptical galaxies 59 Kuiper belt 59 SN #gy 59 astrobiological 59 prebiotic molecules 59 dwarf galaxies 59 distant galaxy 59 Andromeda galaxy 59 asteroids 59 HD#b 59 galaxy 59 brown dwarf 59 protoplanetary disks 59 supernovas 59 planet orbiting 59 GJ#b 59 cosmological distances 59 gravitational lenses 59 Alpha Centauri 59 extragalactic 58 extraterrestrial civilizations 58 radial velocity 58 hot Jupiters 58 Sasselov 58 Gamma ray bursts 58 starburst galaxies 58 Oort Cloud 58 HD# [002] 58 celestial object 58 star Gliese 58 Kuiper Belt objects 58 AGNs 58 aurorae 58 comets orbiting 58 eclipsing binary 58 alien civilizations 58 exosolar planets 58 comets 58 Orion Nebula 58 planets moons 58 gaseous planet 58 Goldilocks planet 58 transiting exoplanets 58 Fermi telescope 58 orbiting planets 58 Saturn moons 58 TrES 4 58 CoRoT 9b 58 galactic mergers 58 Omega Centauri 58 exoplanets planets outside 58 Astrophysicists 58 Galilean satellites 57 eccentric orbits 57 planet HD #b 57 exoplanet orbiting 57 Type Ia supernovae 57 extrasolar worlds 57 Andromeda Galaxy 57 eclipsing binaries 57 Enceladus 57 cosmic phenomena 57 supernova explosion 57 type Ia supernovae 57 Upsilon Andromedae b 57 millisecond pulsars 57 pulsars 57 astrophysical phenomena 57 binary asteroid 57 Sara Seager 57 neutralinos 57 COROT 57 Solar System 57 red supergiants 57 WIMPs 57 Elliptical galaxies 57 Milky Way halo 57 Eta Carinae 57 planetary transits 57 exoplanetary systems 57 solar corona 57 fainter objects 57 celestial bodies 57 Gravitational waves 57 Jovian moon 57 highly elliptical orbits 57 planets orbits 57 lunar craters 56 active galactic nuclei 56 redshifts 56 asteroidal 56 Orionid 56 NASA Kepler spacecraft 56 supermassive 56 moon Enceladus 56 masers 56 red supergiant 56 astrophysical 56 astrophysical objects 56 Extrasolar planets 56 Type Ia supernovas 56 CoRoT 7b 56 Fomalhaut b 56 reionization 56 NASA Kepler 56 Antennae Galaxies 56 gamma ray burst 56 circumstellar disks 56 type Ia supernova 56 distant galaxy clusters 56 Cancri 56 protoplanet 56 cosmological theories 56 NEAs 56 supermassive black holes 56 Martian meteorites 56 globulars 56 proplyds 56 gravitational waves 56 supernova remnants 56 retrograde orbits 56 Kuiper Belt 56 Kuiper Belt object 56 innermost planet 56 galaxy clusters 56 Super Earths 56 supernova explosions 56 magnetic monopoles 56 energetic cosmic rays 56 Higgs boson particle 56 Red Rectangle 56 Type Ia supernova 56 faint galaxies 56 spiral galaxies 56 occultations 56 unmanned probes 56 microlensing events 56 Oort cloud 56 Earths 56 Microlensing 56 IntergalaticEarth 56 TrES 56 electron neutrinos 55 Cepheids 55 intrinsic brightness 55 plutoids 55 GJ #b [002] 55 accretion disk 55 Gliese 55 gamma ray bursts 55 protostars 55 Mandushev 55 protoplanetary disk 55 planet orbits 55 Comet Elenin 55 globular star 55 proto galaxies 55 exoplanets planets 55 galactic cosmic rays 55 X ray binaries 55 OGLE TR #b 55 planet transits 55 supernova 55 Astronomers 55 Saturn Enceladus 55 Konacki 55 Bruce Jakosky 55 astronomers 55 nucleosynthesis 55 supergiant stars 55 interstellar clouds 55 photosphere 55 planetoids 55 celestial objects 55 Wolf Rayet stars 55 extraterrestial 55 Galilean moons 55 galaxy cluster 55 hydrated minerals 55 exo planet 55 moonlets 55 CoRoT #b 55 planetary nebula 55 observable universe 55 Milky Way 55 Jovian moons 55 asteroid 55 distant quasars 55 Crab Nebula 55 Cancri e 55 retrograde orbit 55 ultraviolet wavelengths 55 Evolution Explorer 55 X ray telescopes 55 Cepheid variables 54 galaxy formation 54 extrasolar planetary 54 AU Mic 54 metallicity 54 GRB #B 54 Magellanic Clouds 54 radial velocity method 54 planetary alignments 54 Kepler spacecraft 54 neutron stars 54 Jupiter moon Io 54 dwarf galaxy 54 planet Gliese #c 54 elongated orbits 54 Jupiter icy moons 54 Proxima Centauri 54 Henize #-# 54 supermassive black hole 54 Orion nebula 54 hypervelocity stars 54 constellation Cassiopeia 54 supergiant star 54 Hot Jupiters 54 protoplanetary discs 54 radial velocity technique 54 neutralino 54 novae 54 subsurface ocean 54 Pluto Charon 54 planet Uranus 54 organic molecules 54 CoRoT 54 interstellar cloud 54 ULIRGs 54 UDFy # 54 RRATs 54 Beta Pictoris 54 elliptical galaxy 54 protostar 54 quasar 54 unaided eye 54 outer planets 54 nebular 54 Ring Nebula 54 Pieter van Dokkum 54 Epsilon Aurigae 54 radioactive nuclei 54 galaxy M# [002] 54 cluster NGC 54 planetary surfaces 54 supersymmetry 54 Sedna 54 periodic dimming 54 blazar 54 Saturn moon 54 Agol 54 binary asteroids 54 interstellar dust 54 icy comets 54 Exoplanets 53 HL Tau 53 moons circling 53 planet 53 distant suns 53 Fomalhaut 53 Saturnian moons 53 antimatter particles 53 distant supernovas 53 Zeta Ophiuchi 53 astronomical phenomena 53 Virgo Cluster 53 noctilucent clouds 53 star Proxima Centauri 53 X ray emission 53 XMM Newton 53 nebula 53 dwarf spheroidal galaxies 53 neutron star 53 planet WASP #b 53 Gliese #G 53 detect gravitational waves 53 Kepler 9c 53 galactic nuclei 53 Meridiani 53 blazars 53 extraterrestrial civilization 53 planets atmospheres 53 sunlike star 53 hydrothermal vent 53 Cosmologists 53 planets comets 53 Wolf Rayet star 53 planets asteroids 53 chondrites 53 dust enshrouded 53 carbonaceous chondrites 53 Carina constellation 53 SUSY 53 Type 1a supernovae 53 gravitational wave 53 planetary orbits 53 CoRoT satellite 53 Gamma ray burst 53 magnetospheres 53 redshift 53 antineutrinos 53 hematite mineral 53 proto planetary disks 53 SN #A 53 Trojan asteroids 53 permanently shadowed 53 IRC +# 53 antiparticle 53 cosmological models 53 Pleiades cluster 53 COROT 7b 53 SCP #F# 53 Kuiper belt object 53 baryonic matter 53 Triangulum 53 KH #D 53 VB #b 53 constellation Cetus 53 circumstellar 53 Gliese #e 53 comet McNaught 53 AB Aurigae 53 supernovae explode 53 Supernovae 53 Type Ia 53 Saturn moon Enceladus 53 Betelgeuse 53 Grillmair 53 van Dokkum 53 meteorites 53 Perseus Cluster 53 G#.# +#.# 53 evolve Borucki 53 SN#A 53 comet 52 astrobiology 52 chemical abundances 52 interstellar dust grains 52 neutrino 52 gravitational perturbations 52 Comet Machholz 52 interstellar molecules 52 constellation Cygnus 52 Geminga 52 Cygnus Lyra region 52 #gy 52 stellar occultations 52 sterile neutrino 52 Toutatis 52 protons collide 52 Coma Cluster 52 constellation Hercules 52 millisecond pulsar 52 Neutron stars 52 impactors 52 BP Piscium 52 planet TrES 52 GQ Lupi 52 galactic cores 52 spectroscopic observations 52 RQ# 52 planetary embryos 52 hydrothermal vents 52 Neptune Uranus 52 constellation Virgo 52 Large Magellanic Cloud 52 Hale Bopp 52 HD #b [001] 52 Jupiter moons 52 accretion disks 52 Cosmic rays 52 brightest supernova 52 elliptical orbits 52 auroral 52 Charles Beichman 52 chondrules 52 meteor impacts 52 mineralogical composition 52 Stephan Quintet 52 TNOs 52 galactic clusters 52 substorms 52 Jenniskens 52 R Coronae Borealis 52 lifeforms 52 HM Cancri 52 cosmic neutrinos 52 coronal mass ejections CMEs 52 constellation Centaurus 52 Saturn rings 52 lunar crust 52 optical telescopes 52 supersymmetric 52 P/# A2 52 Eagle Nebula 52 exoplanet atmospheres 52 phyllosilicates 52 constellation Sagittarius 52 planetary Transits 52 stellar seismology 52 Galaxy Evolution 52 supernova remnant 52 astrometry 52 moonlet 52 Voorwerp 52 X ray observatories 52 astrophysicists 52 Magnetars 52 tholins 52 telescopes astronomers 52 spectroscopically 52 cometary material 52 tidally locked 52 Drake Equation 52 TGFs 52 extraterrestrial 52 Goldilocks zone 52 Delta Cephei 52 HAT P 52 trans Neptunian objects 52 interacting galaxies 51 moons Phobos 51 meteoroids 51 NASA Kepler telescope 51 orbits 51 cosmic microwave radiation 51 SMBH 51 Dwarf galaxies 51 lunar poles 51 moons 51 COROT exo 3b 51 gravitational lens 51 substorm 51 Bug Nebula 51 constellation Carina 51 magnetic reconnection 51 Orionids 51 meteoroid impacts 51 Saturnian moon Titan 51 abundances 51 planetesimals 51 HII regions 51 Kuiper Belt Object 51 pulsar 51 choanoflagellates 51 brightnesses 51 Manned missions 51 Lunine 51 protoplanets 51 Comet Hartley 2 51 infalling 51 Earth asteroids NEAs 51 #P/Churyumov-Gerasimenko 51 subatomic particle 51 Saturn magnetosphere 51 moon Io 51 planetoid 51 Pluto Eris 51 hypernova 51 circumstellar disk 51 mu Arae 51 sunspots 51 filamentary structure 51 assumed planets circling 51 Jupiter Saturn 51 gamma ray emission 51 dustier stormier atmosphere 51 Filippenko 51 geoneutrinos 51 infrared wavelengths 51 tau neutrinos 51 cosmological observations 51 celestial sphere 51 ionized hydrogen 51 constellations planets 51 Earth biosphere 51 magnetosphere 51 Terrestrial Planet Finder 51 ecliptic plane 51 orbital resonance 51 protoplanetary 51 planetary astronomy 51 Syrtis Major 51 dimming starlight 51 Venusian atmosphere 51 solar nebula 51 strangelets 51 asteroid impacts 51 Gondolo 51 Comet Holmes 51 galaxy M# [001] 51 supergiants 51 prebiotic chemistry 51 active galactic nucleus 51 theoretical particle 51 missing baryons 51 Hawking radiation 51 Io Europa 51 gravitational wobbles 51 extremophiles 51 starburst galaxy 51 moon Charon 51 planets constellations 51 Globular clusters 51 afterglows 51 blue supergiant 51 intelligent beings 51 auroral displays 51 intracluster 51 baryons 51 circular orbits 51 moons orbiting Saturn 51 hypervelocity star 51 dusty disks 51 X ray observatory 51 dirty snowballs 51 Fornax cluster 51 observable phenomena 51 photosynthetic organisms 51 Saturnian moon 50 supernovae explosions 50 orbiting Chandra 50 Saturn aurora 50 galaxies collide 50 Arches Cluster 50 SIRTF 50 Higgs boson 50 Alfven waves 50 Bok globules 50 planets Uranus 50 Tarantula Nebula 50 Tau Ceti 50 undersea volcanoes 50 Gemini constellation 50 GALEX 50 Avishay Gal Yam 50 PSR J# 50 solar flares 50 axion 50 Spitzer Space Telescope 50 optical spectra 50 equatorial regions 50 gravitational interactions 50 gravitational lensing 50 Phoebe orbits 50 Astrophysics Cambridge Mass. 50 cosmic cannibal 50 planetary atmospheres 50 heliopause 50 J# +# [002] 50 coronal loops 50 constellation Ursa Major 50 coronal loop 50 cometary 50 planetary nebulas 50 cosmologists 50 Mini TES 50 universe 50 constellations 50 Comet Hale Bopp 50 gamma ray observatory 50 interstellar distances 50 outer corona 50 Rossby waves 50 Rosette Nebula 50 zodiacal light 50 Saturn outermost 50 WIMPS 50 Quaoar 50 microquasar 50 earths 50 quark gluon plasma 50 ultracold atoms 50 supervolcanoes 50 constellation Aquarius 50 Fermi Paradox 50 RHESSI 50 asteroid belt 50 antiparticles 50 gravitational radiation 50 HIRES spectrometer 50 microlensing 50 Charon Pluto 50 superheavy elements 50 Comet Lulin 50 lunar perigee 50 infrared telescopes 50 Pleiades star 50 Exoplanet 50 Nasa Kepler 50 VY Canis Majoris 50 Astrobiologists 50 constellation Taurus 50 supermassive stars 50 carbonate minerals 50 Tevatron experiments 50 biosignature 50 baryon 50 SMBHs 50 magnetic substorms 50 NEOs 50 exosphere 50 globular cluster M# 50 interstellar dust particles 50 photosynthetic microbes 50 coronal mass ejections 50 GRB # 50 Queloz 50 ionized gas 50 extraterrestrial UFOs 50 asteroids orbiting 50 submillimeter 50 panspermia 50 Hanny Voorwerp 50 earthlike 50 ejecta 50 Seth Shostak 50 planetary scientist 50 God Particle 50 cosmic rays 50 high redshift galaxies 50 Sombrero Galaxy 50 hydrogen helium 50 dinosaur extinction 50 permanently shadowed regions 50 spherical halo 50 spiral galaxy 50 galactic 50 Svedhem 50 relativistic particles 50 IRAS #-# 50 Mojzsis 50 constellation Leo 50 Mimas 50 Martian crater 49 Werthimer 49 Cepheid variable 49 primitive organisms 49 hydrostatic equilibrium 49 Apophis asteroid 49 Alfvén waves 49 Kepler Space Telescope 49 Avi Loeb 49 shadowy craters 49 Solar TErrestrial RElations Observatory 49 Earth objects NEOs 49 Martian rocks 49 Hubble observations 49 polar craters 49 Martian microbes 49 outermost planets 49 spiral nebulae 49 interstellar space 49 astronomer 49 gravitational pulls 49 Trapezium 49 MG J# +# 49 superfluids 49 Meridiani Planum 49 geostationary orbits 49 olivine mineral 49 Wide Angle Search 49 constellation Eridanus 49 rocky terrestrial planets 49 R#a# 49 Nikku Madhusudhan 49 colliders 49 Martian craters 49 Lake Vostok 49 GZK cutoff 49 superstrings 49 Pegasi 49 astronomical observations 49 cryovolcanism 49 inner Oort Cloud 49 aurora 49 jovian 49 BLG #Lb 49 faraway planets 49 Smithsonian astronomer 49 cosmos 49 Puppis 49 primordial galaxies 49 carbonate globules 49 colliding galaxies 49 gravitationally lensed 49 blackholes 49 Europa Ganymede 49 Dauphas 49 barred spiral galaxy 49 infall 49 SN #C 49 Comet Hartley 49 Kepler Mission 49 constellation Pegasus 49 Gamma rays 49 diffuse aurora 49 abiogenesis 49 Muchachos Observatory 49 auroras 49 William Borucki Kepler 49 elusive Higgs boson 49 galactic halo 49 submillimeter galaxies 49 William Borucki 49 Coma cluster 49 fainter 49 Nasa spacecraft 49 UCDs 49 magma ocean 49 Christophe Lovis 49 giant gaseous planets 49 HiRISE image 49 De Pontieu 49 Dimitar Sasselov 49 meteor showers 49 antihydrogen atoms 49 Samuel Oschin Telescope 49 smallest exoplanets 49 Kepler 9b 49 Dan Werthimer 49 microbial ecosystems 49 CMB radiation 49 lunar meteorites 49 asteroid collisions 49 V# Mon 49 Titan Saturn 49 smoothest flattest 49 RY Sagittarii 49 single celled microorganisms 49 Amateur astronomers 49 spatially resolved 49 asteroseismology 49 Lars Hernquist 49 dynamical processes 49 comet Lulin 49 icy moon Enceladus 49 Epsilon Indi 49 Churyumov Gerasimenko 49 luminosities 49 Geminids 49 occulted 49 cosmic collisions 49 superbubble 49 Spudis 49 faintest galaxies 49 stromatolites 49 ULP cepheids 49 inner asteroid belt 49 comet nucleus 49 PZ Tel 49 neighboring Andromeda galaxy 49 infalling gas 49 optical wavelengths 49 dynamical evolution 49 Lagoon Nebula 49 galactic collisions 49 meteors 49 particle acceleration 49 Higgs Boson 49 orbiting 49 Jill Tarter 49 Mars 49 thermonuclear reactions 49 galaxies nebulae 49 habitability 48 interstellar medium 48 proto planetary disk 48 spherically symmetric 48 Astrophysical 48 telescopic observations 48 Jupiter Uranus 48 Monoceros 48 dwarf planets 48 particle colliders 48 gamma ray emitting 48 airglow 48 Earth magnetosphere 48 Cygnus X 48 spatial dimensions 48 novas 48 Cosmic Microwave Background 48 Jonathan Lunine 48 dense clumps 48 eukaryote 48 celestial phenomena 48 nebulosity 48 meteorite impacts 48 GLAST telescope 48 Hipparcos 48 energetic electrons 48 XTE J# 48 Saturn outermost ring 48 smallest extrasolar planet 48 wavefunction 48 WHIM 48 enterotypes 48 comets meteors 48 mineral hematite 48 BLG #L 48 high temperature superconductivity 48 lensing galaxy 48 stellar occultation 48 reionization epoch 48 blue straggler 48 gravitationally 48 microlensing technique 48 star Fomalhaut 48 interstellar grains 48 atmospheric neutrinos 48 Uranus Neptune 48 Cabeus 48 frigid arctic plains 48 Higgs Boson particle 48 starquakes 48 TW Hydrae 48 transiting exoplanet 48 Fashion Movie Reviews 48 Lutetia 48 giant elliptical galaxy 48 gamma ray flares 48 NASA rovers Spirit 48 Ulysses spacecraft 48 Saturn auroras 48 Sagittarius dwarf galaxy 48 SETI Search 48 antimatter 48 silicates 48 planetesimal 48 Nibiru 48 Gravitational lensing 48 asteroid Vesta 48 albedo reflectivity 48 Voyager spacecraft 48 active volcanism 48 Maunder minimum 48 Quadrantids 48 zodiac constellations 48 GLAST 48 zodiacal constellations 48 gravitational tides 48 X ray Observatory 48 magnetotail 48 SDSS II 48 Mars Squyres 48 Ground penetrating radar 48 shadowed craters 48 mysterious uncharted 48 SMM J# 48 Kazantzidis 48 orbiting gamma ray 48 galactic disk 48 undiscovered particle 48 Saturn Cassini 48 Extrasolar Planets 48 Great Orion Nebula 48 ESO VLT 48 elongated orbit 48 shadow biosphere 48 X ray afterglow 48 Squyres Cornell 48 Supernova #A 48 crystalline silicates 48 RS Ophiuchi 48 Doppler shifts 48 Asteroid Belt 48 coronal holes 48 plutoid 48 Mössbauer 48 spinning neutron stars 48 galactic magnetic 48 polarimetry 48 visible wavelengths 48 Mamajek 48 silicon monoxide 48 filamentary structures 48 Dumbbell Nebula 48 Keck telescope 48 Triangulum Galaxy 48 LHC experiments 48 Extraterrestrial Intelligence Institute 48 NASA Fermi Gamma 48 cometary dust 48 hadrons 48 habitable 48 thermonuclear explosion 48 solar radii 48 ray Space Telescope 48 Orion constellation 48 journal Meteoritics 48 galaxy redshift 48 STEREO mission 48 constellation Libra 48 single celled 48 spectroscopic measurements 48 muon neutrinos 48 comet #P/Churyumov-Gerasimenko 48 cometary debris 48 Mimivirus 48 Uranus 48 nebulas 48 Endurance crater 48 Andromeda halo