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(Click for frequent words.) 84 exoplanets 75 planets 75 planets orbiting 75 exoplanet 74 extrasolar planet 73 planets orbiting distant 72 transiting planets 71 rocky planets 71 Earthlike planets 70 habitable planets 70 KBOs 70 brown dwarfs 69 extrasolar 69 planets orbiting stars 68 super Earths 68 exoplanets orbiting 67 HD #b [002] 67 astronomers 67 GRBs 66 exoplanetary 66 quasars 66 supernovae 66 pulsars 66 distant supernovae 66 brown dwarf 66 gravitational microlensing 66 WASP #b 65 XMM Newton 65 exo planets 65 Milky Way galaxy 65 distant galaxies 65 Kuiper belt objects 65 HD#b 65 microlensing 65 Kepler #b 65 planet orbiting 65 galaxies 65 Orion Nebula 65 X ray binary 64 Sedna 64 transiting planet 64 radial velocity 64 gamma ray bursts 64 terrestrial planets 64 Beta Pictoris b 64 astronomical objects 64 icy moons 64 hot Jupiters 64 comets 64 planets astronomers 64 planemos 64 X ray wavelengths 64 extrasolar planetary systems 64 planetary nebulae 64 microlensing events 64 Gliese #g 63 COROT 63 distant galaxy 63 Epsilon Eridani 63 sunlike stars 63 millisecond pulsars 63 protoplanetary disks 63 magnetar 63 globular clusters 63 planets orbiting sun 63 magnetars 63 Andromeda Galaxy 63 Earthlike planet 63 Milky Way Galaxy 63 quasar 63 distant quasars 62 smallest exoplanet 62 SN #gy 62 Earthlike 62 galaxy clusters 62 extrasolar planets orbiting 62 planets circling 62 Upsilon Andromedae 62 Kuiper Belt Objects 62 AGNs 62 elliptical galaxies 62 AB Aurigae 62 Corot 7b 62 TrES 62 Kuiper Belt object 62 Hubble observations 62 Milky Way 62 gaseous planet 62 gravitational lenses 61 Saturn rings 61 merging galaxies 61 Spitzer Space Telescope 61 infrared wavelengths 61 WIMPs 61 solar corona 61 X ray telescopes 61 potentially habitable planets 61 Fomalhaut b 61 fainter objects 61 Gliese #c 61 GJ#b 61 Pluto Charon 61 Kuiper belt 61 moon Charon 61 dwarf galaxies 61 planet orbits 61 Fermi telescope 61 Wolszczan 61 GRB #B 61 CoRoT 9b 61 Astronomers 61 asteroids 60 gamma ray burst 60 earthlike planets 60 X ray emission 60 luminous galaxies 60 star Gliese 60 hypervelocity stars 60 globular cluster 60 supernovas 60 nebulae 60 Galaxy Evolution 60 extragalactic 60 pulsar 60 supernova 60 Kepler spacecraft 60 radial velocity method 60 exosolar planets 60 phyllosilicates 60 Kuiper Belt objects 60 Omega Centauri 60 innermost planet 60 gravitational lensing 60 Epsilon Aurigae 60 Galilean satellites 60 NASA Kepler 60 gravitational waves 60 galaxy cluster 60 Higgs particle 60 exo planet 60 cosmological distances 60 Andromeda galaxy 60 astrophysicists 60 galaxy 60 AU Mic 59 CoRoT satellite 59 occultations 59 Eta Carinae 59 Solar System 59 starburst galaxies 59 optical telescopes 59 GALEX 59 redshift 59 astrometry 59 intrinsic brightness 59 NASA Kepler spacecraft 59 eclipsing binary 59 neutron star 59 GJ #b [001] 59 inhabitable planets 59 Galilean moons 59 Earth asteroids 59 Kuiper Belt 59 SN #A 59 celestial bodies 59 moons orbiting 59 Gliese 59 habitable worlds 59 habitable zones 59 Cancri e 59 noctilucent clouds 59 active galactic nuclei 59 CoRoT 7b 59 exoplanet orbiting 59 Saturn moons 59 Microlensing 59 BP Psc 58 gravitationally bound 58 Antennae Galaxies 58 faint galaxies 58 Type Ia supernovae 58 celestial objects 58 planet HD #b 58 red supergiant 58 Cepheid variables 58 Beta Pictoris 58 neutrino 58 interacting galaxies 58 galactic mergers 58 supersymmetric particles 58 Higgs bosons 58 supernova explosion 58 Venusian atmosphere 58 OGLE TR #b 58 moons 58 axions 58 Red Rectangle 58 transiting exoplanets 58 RXTE 58 Enceladus 58 planet Uranus 58 Gliese #d 58 HD# [002] 58 Kuiper belt object 58 redshifts 58 Corot 9b 58 comet 58 hydrated minerals 58 Cancri 58 distant galaxy clusters 58 Astrophysicists 58 X ray observatories 58 TrES 4 58 planetary 58 GJ #b [002] 58 metallicity 58 X ray observatory 57 astrophysical 57 galaxy NGC 57 UDFy # 57 type Ia supernovae 57 moonlets 57 binary asteroid 57 GRB # 57 supernova remnant 57 neutron stars 57 CoRoT 57 asteroid 57 ultraviolet wavelengths 57 exoplanets planets outside 57 lunar crust 57 SIRTF 57 astronomical observations 57 Hale Bopp 57 Comet Hale Bopp 57 nebula 57 BLG #Lb 57 supernova remnants 57 Evolution Explorer 57 outer planets 57 infrared spectra 57 planets orbits 57 globulars 57 aurorae 57 habitable zone 57 constellation Cassiopeia 57 Martian meteorites 57 spiral galaxies 57 Cepheids 57 Henize #-# 57 gamma ray observatory 57 X ray binaries 57 masers 57 radial velocity technique 57 Quaoar 57 Exoplanet 57 Kuiper Belt Object 57 gaseous planets 57 RRATs 57 interstellar dust 57 Wolf Rayet stars 57 OGLE 57 brightest supernova 56 electron neutrinos 56 dwarf galaxy 56 proplyds 56 supernova explosions 56 neutrinos 56 ringed planet 56 reionization 56 asteroids comets 56 potentially habitable 56 millisecond pulsar 56 Fomalhaut 56 HAT P 56 planets circling stars 56 starburst galaxy 56 telescopic observations 56 Comet Machholz 56 elliptical galaxy 56 Delta Cephei 56 supermassive black hole 56 planetary transits 56 telescopes astronomers 56 Extrasolar planets 56 exosphere 56 constellation Cygnus 56 ESO VLT 56 asteroid Vesta 56 eclipsing binaries 56 protoplanet 56 celestial object 56 red supergiants 56 sized planets orbiting 56 KH #D 56 astrobiologists 56 spectroscopic 56 Keck telescope 56 stellar nurseries 56 G#.# +#.# 56 Kepler 56 telescopes 56 unaided eye 56 planets moons 56 spectroscopic observations 56 geoneutrinos 56 Gliese #e 56 supermassive black holes 56 Oort cloud 56 SDSS II 56 Konacki 56 moon Enceladus 56 comets asteroids 56 Ring Nebula 55 gravitational wave 55 BLG #L 55 Io Europa 55 Voyager spacecraft 55 Mauna Kea Hawaii 55 supergiant star 55 Toutatis 55 stellar occultations 55 Saturn moon 55 SIM PlanetQuest 55 planet transits 55 novae 55 cosmic phenomena 55 interstellar dust grains 55 Ulysses spacecraft 55 Gravitational waves 55 OGLE TR 55 Oort Cloud 55 Jupiter moon Io 55 optical wavelengths 55 Large Magellanic Cloud 55 Orion nebula 55 Betelgeuse 55 coronagraph 55 trans Neptunian objects 55 constellation Ursa Major 55 Lyman alpha 55 orbits 55 retrograde orbits 55 protostar 55 cosmologists 55 Hot Jupiters 55 Arches Cluster 55 planet TrES 55 constellation Sagittarius 55 exoplanets planets 55 protostars 55 Sasselov 55 Exoplanets 55 Higgs boson particle 55 NASA Cassini spacecraft 55 Pluto Eris 55 infrared telescopes 55 NASA Wilkinson Microwave 55 blazars 55 VIRTIS 55 Type Ia supernova 55 distant quasar 55 galaxy M# [002] 55 filamentary structure 55 spectroscopically 55 orbiting Mars 55 EPOXI 55 Terrestrial Planet Finder 55 plutoids 55 nucleosynthesis 55 HIRES spectrometer 55 constellation Centaurus 55 Carina constellation 55 Martian surface 55 Keck telescopes 55 NASA Chandra 55 earthshine 55 transiting exoplanet 55 Gamma ray bursts 55 polarimetry 55 comet McNaught 54 sunspots 54 Crab Nebula 54 lunar craters 54 Geminids 54 Comet McNaught 54 HM Cancri 54 planet Gliese #g 54 cosmic rays 54 detect gravitational waves 54 circumstellar disks 54 supermassive 54 photosphere 54 RHESSI 54 Kepler Mission 54 Comet Lulin 54 planets Uranus 54 highly elliptical orbits 54 HD #b [001] 54 RS Ophiuchi 54 moon Europa 54 J# +# [002] 54 mu Arae 54 Coma Cluster 54 Cassini Huygens 54 planetary Transits 54 spatially resolved 54 Nasa spacecraft 54 astronomer 54 Hanny Voorwerp 54 TNOs 54 observable universe 54 comets orbiting 54 astronomical phenomena 54 Very Large Telescope 54 baryons 54 Cosmic Evolution 54 Comet Holmes 54 galactic cosmic rays 54 constellation Hercules 54 COROT 7b 54 dirty snowballs 54 substorms 54 gravitational lens 54 fainter 54 orbiting planets 54 visible wavelengths 54 globular star 54 meteorites 54 orbiting observatories 54 galactic clusters 54 Saturn moon Enceladus 54 CoRoT #b 54 THEMIS 54 retrograde orbit 54 photometry 54 elliptical orbits 54 Explorer WISE 54 Milky Way halo 54 extrasolar planetary 54 galaxy M# [001] 54 Upsilon Andromedae b 54 HiRISE image 54 Earths orbiting 54 PSR J# 54 ESO telescopes 54 Maunder minimum 54 magnetosphere 54 ULIRGs 54 Gamma ray burst 54 asteroidal 54 HL Tau 54 orbiting 54 supersymmetric 54 quark gluon plasma 54 Comet Hartley 2 54 Cassini flyby 53 Kepler Space Telescope 53 Optical Gravitational Lensing Experiment 53 WM Keck Observatory 53 ESA XMM Newton 53 infrared radiation 53 habitable planet 53 moonlet 53 Hubble Space Telescope HST 53 astrophysical phenomena 53 optical interferometry 53 Viking landers 53 interstellar clouds 53 cosmic microwave background 53 Goldilocks planet 53 comet nucleus 53 Saturnian moons 53 biosignatures 53 VB #b 53 NASA rovers Spirit 53 constellation Virgo 53 spatial dimensions 53 blazar 53 Saturnian moon 53 Kepler telescope 53 Magellanic Clouds 53 orbiting Hubble Space Telescope 53 asteroseismology 53 Orionids 53 elongated orbits 53 superfluidity 53 Gravitational lensing 53 constellation Carina 53 Pieter van Dokkum 53 baryon 53 lensing galaxy 53 NASA Fermi Gamma 53 nebular 53 Saturn Cassini 53 periodic dimming 53 star Fomalhaut 53 galaxy formation 53 Keck Interferometer 53 spiral galaxy 53 Wilkinson Microwave Anisotropy Probe 53 Proxima Centauri 53 organic molecules 53 sterile neutrino 53 Quadrantids 53 Cat Paw Nebula 53 Orion constellation 53 planets comets 53 antihydrogen atoms 53 Uranus Neptune 53 exoplanetary systems 53 Super Earths 53 ultracold atoms 53 ESO Very Large Telescope 53 brightnesses 53 interstellar molecules 53 Mojzsis 53 Alfven waves 53 accretion disk 53 spiral galaxy Messier 53 Type 1a supernovae 53 infrared observatory 53 #gy 53 Space Telescope 53 astrobiology 53 planetary nebula 53 Tarantula Nebula 53 Solar TErrestrial RElations Observatory 53 magnetospheric 53 spectrographs 53 spiral galaxy NGC 53 cryovolcanism 53 planetoid 53 heliosphere 53 protoplanetary disk 53 ESO PR 53 Comet Halley 53 SOHO spacecraft 53 Sara Seager 53 JWST 53 Leonids 53 planetary astronomy 53 Zeta Ophiuchi 53 type Ia supernova 53 Nasa Kepler 53 celestial sphere 53 Mimas 53 magnetic monopoles 53 globular cluster M# 53 Cassini 53 Jupiter moons 53 Kepler 9c 53 Red Planet 53 VY Canis Majoris 53 APXS 53 subsurface ocean 53 occulted 52 giant gaseous planets 52 NASA twin rovers 52 distant supernovas 52 auroral 52 MG J# +# 52 adaptive optics 52 constellation Lyra 52 Great Observatories 52 star Beta Pictoris 52 meteoroids 52 supergiant stars 52 NEAs 52 galactic nuclei 52 P/# A2 52 axion 52 submillimeter galaxies 52 HARPS spectrograph attached 52 Bruce Jakosky 52 intracluster 52 AKARI 52 orbited Jupiter 52 icy comets 52 ALH# 52 interstellar dust particles 52 WMAP satellite 52 solar nebula 52 constellation Taurus 52 Muchachos Observatory 52 telescope 52 nicknamed Xena 52 Anisotropy Probe WMAP 52 Bose Einstein condensates 52 moons circling 52 infrared telescope 52 HARPS instrument 52 VLTI 52 sunlike star 52 WFC3 52 Comet Hartley 52 substorm 52 Eagle Nebula 52 radial velocities 52 Stephan Quintet 52 comet Hale Bopp 52 MicroFUN 52 Planck satellite 52 exoplanet hunter 52 Trifid Nebula 52 barred spiral galaxy 52 Triangulum Galaxy 52 planets Kepler 52 stellar seismology 52 permanently shadowed craters 52 Nikku Madhusudhan 52 dust enshrouded 52 moons Phobos 52 SN#A 52 NASA Kepler telescope 52 WMAP 52 XTE J# 52 Orionid 52 Jovian moons 52 SCP #F# 52 supervolcanoes 52 ESA Integral 52 cometary 52 interstellar dust clouds 52 Earths 52 muons 52 Magnetars 52 stellar occultation 52 Cosmologists 52 smallest extrasolar planet 52 NASA Cassini 52 Saturnian moon Titan 52 Wolf Rayet star 52 Small Magellanic Cloud 52 Astrophysics Cambridge Mass. 52 baryonic matter 52 eccentric orbits 52 SUSY 52 orbiting gamma ray 52 neutrino particles 52 moons orbiting Saturn 52 Virgo Cluster 52 infrared interferometry 52 Bug Nebula 52 Perseids 52 Pluto 52 Kepler Telescope 52 Hawking radiation 52 Christophe Lovis 52 gamma ray flares 52 baryonic 52 asterism 52 carbonaceous chondrites 52 NICMOS 52 jovian 52 HARPS spectrograph 52 God Particle 52 UB# [003] 52 Halley comet 52 energetic cosmic rays 52 dwarf planets 52 planet HD#b 52 chemical abundances 52 spacecraft flyby 51 unmanned probes 51 Noctilucent clouds 51 circumstellar disk 51 planetoids 51 2MASS 51 Herschel Space Telescope 51 ejecta 51 DZero 51 Cosmic Microwave Background 51 zodiacal light 51 occultation 51 luminosities 51 bolometers 51 magma ocean 51 Astrophysical Journal 51 CRISM 51 RQ# 51 Lunokhod 51 magnetic reconnection 51 interstellar cloud 51 cosmological models 51 galactic cores 51 auroras 51 extrasolar worlds 51 Lagoon Nebula 51 Samuel Oschin Telescope 51 extraterrestrial civilizations 51 GLAST 51 gravitational interactions 51 accretion disks 51 CMB radiation 51 Mini TES 51 Higgs boson 51 Near Infrared Camera 51 planet 51 Rosette Nebula 51 HARPS 51 Pegasi 51 #P/Holmes 51 ray Space Telescope 51 Grillmair 51 KamLAND 51 Martian equator 51 constellation Orion 51 Saturnian system 51 Supernova #A 51 relativistic particles 51 TW Hydrae 51 rovers Spirit 51 afterglows 51 HUDF 51 Bok globules 51 Fornax cluster 51 shorter wavelengths 51 aurora 51 Neptune Uranus 51 Pleiades cluster 51 Saturn magnetosphere 51 hypervelocity star 51 AUs 51 Astrophysical 51 planetary nebulas 51 X ray Observatory 51 Trojan asteroids 51 rover Opportunity 51 astrophysical objects 51 active galactic nucleus 51 high temperature superconductivity 51 solar radii 51 dinosaur extinction 51 asteroids orbiting 51 TGFs 51 comet Lulin 51 missing baryons 51 blue supergiant 51 Cassini spacecraft 51 Cygnus Lyra region 51 Adam Riess 51 colliding galaxies 51 high redshift galaxies 51 LORRI 51 Hipparchus 51 solar flares 51 Helix nebula 51 Jupiter Saturn Uranus 51 spherically symmetric 51 robotic rovers 51 spectrometers 51 spiral nebulae 51 NEOs 51 circumstellar 51 polar regions 51 gamma ray telescopes 51 hematite mineral 51 Jupiter Saturn 51 neutrino detectors 51 coronal loops 51 Giovanni Cassini 51 attosecond 51 LOFAR 51 neutral mass spectrometer 51 SDSS 51 Earthshine 51 Descent Imager Spectral Radiometer 51 perihelion 51 antiparticle 51 cluster NGC 51 gravitational wobbles 51 outermost planets 51 Jonathan Lunine 51 moon Ganymede 51 lunar poles 51 cosmological observations 51 infrared 51 IRAS #-# 51 martian 51 Saturn aurora 51 lobate scarps 51 chondrites 51 XO 3b 51 spectroscopy 50 MESSENGER 50 celestial phenomena 50 NASA Far Ultraviolet 50 spacecraft Cassini 50 NEOWISE 50 Global Surveyor 50 circular orbits 50 constellation Aquarius 50 proto planetary disks 50 Perseus Cluster 50 Lunar Reconnaissance Orbiter LRO 50 CMEs 50 noctilucent 50 subatomic particles 50 supersymmetry 50 dust devils 50 X ray pulses 50 Orbiter LRO 50 Jovian moon 50 lunar perigee 50 microquasar 50 constellation Perseus 50 infrared spectrograph 50 Meridiani 50 Herschel telescope 50 S/# P2 50 Keck Telescope 50 carbonate minerals 50 equatorial regions 50 ionized hydrogen 50 constellation Cetus 50 High Accuracy Radial 50 moon Io 50 cosmological theories 50 IceCube 50 NGC# 50 Higgs Boson 50 GQ Lupi 50 lunar meteorites 50 submillimeter wavelengths 50 diffuse aurora 50 Goldilocks zone 50 Sromovsky 50 Iapetus 50 SN #C 50 polar craters 50 boson 50 Pleiades 50 Mössbauer 50 millimeter wavelengths 50 Palomar Observatory 50 Puppis 50 infrared imager 50 Martian craters 50 neutralino 50 spectroscopic analysis 50 smallest exoplanets 50 Lunine 50 general relativity 50 Lick Observatory 50 Quadrantid meteor shower 50 neutron spectrometer 50 NASA STEREO 50 Diviner 50 Pan STARRS 50 galactic bulge 50 orbiting telescope 50 infrared wavelength 50 GeV 50 brightest comet 50 Geminga 50 Lyrids 50 sunspot 50 Hyakutake 50 STEREO spacecraft 50 De Pontieu 50 abundances 50 Svedhem 50 R Coronae Borealis 50 Cassini ion 50 antineutrinos 50 NASA rovers 50 THEMIS satellites 50 Lowell Observatory 50 ultraluminous galaxy 50 Voorwerp 50 Mars Reconnaissance Orbiter 50 R#a# 50 interstellar medium 50 Saturnian 50 ionized gas 50 Type Ia supernovas 50 gravitational radiation 50 Dauphas 50 constellation Pegasus 50 Tycho supernova 50 antihydrogen 50 Titan Saturn 50 Comet Elenin 50 gamma rays 50 largest moon Charon 50 V# Mon 50 amateur astronomers 50 Butterfly Nebula 50 asteroid belt 50 chondrules 50 neutralinos 50 RS Oph 50 Huygens mission 50 Cassini flybys 50 submillimeter 50 infrared astronomy 50 Charon Pluto 50 ULP cepheids 50 Uranus 50 gamma ray 50 YU# 50 Anisotropy Probe 50 Laser Interferometer Gravitational Wave 50 HiRISE camera aboard 50 foreground galaxy 50 Sagittarius B2 50 cosmic ray 50 Haumea 50 planetesimals 50 MARSIS radar 50 Earth magnetosphere 50 KT boundary 50 IRC +# 50 astrobiological 50 Olympus Mons 50 HiRISE images 50 Extrasolar Planets 50 volcanically active 50 submillimetre 50 planetary scientist 50 Enceladus flybys 50 Lutetia 50 HESS telescopes 50 Mamajek 50 impactors 50 astronomer Clyde Tombaugh 50 proto galaxies 50 HII regions 50 Alpha Centauri 50 solar eclipses 50 star Proxima Centauri 50 Mars 50 NASA Cosmic Background 50 Saturn Enceladus 50 Type Ia 50 polar caps 50 interstellar particles 50 HiRISE 50 Mpc 50 supernova SN 49 heavily cratered 49 high temperature superconductors 49 particle detectors 49 planetary orbits 49 rocky extrasolar planet 49 Opportunity rover 49 MARSIS 49 XMM Newton observations 49 Avishay Gal Yam 49 arcminutes 49 Bose Einstein condensate 49 detect gamma rays 49 SINFONI 49 optical spectra 49 spherical halo 49 Jupiter Uranus 49 Keck Observatory 49 Cygnus X 49 moon Titan 49 Planetary Transits 49 Orionid meteors 49 Mandushev 49 weak gravitational lensing 49 CAIs 49 planets atmospheres 49 Halley Comet 49 Infrared Thermal Imaging Spectrometer 49 Palaeocene Eocene Thermal Maximum 49 Bullet Cluster 49 COROT exo 3b 49 muon neutrino 49 radio occultation 49 lightest exoplanet 49 Saturn Jupiter Uranus 49 reflection nebula 49 UVOT 49 interferometry 49 Mars landers 49 spectra 49 binary quasar 49 exoplanet discoveries 49 GRB# 49 Tevatron experiments 49 tiniest particles 49 Churyumov Gerasimenko 49 superheavy elements 49 Supernovae 49 Jupiter Ganymede 49 superlens 49 zodiacal dust 49 NASA Cassini orbiter 49 planet WASP #b 49 magnetospheres 49 Eridani 49 Pleiades star 49 #P/Churyumov-Gerasimenko 49 VISTA telescope 49 Cassini Huygens spacecraft