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(Click for frequent words.) 81 galaxies 77 quasar 76 globular clusters 76 distant galaxies 75 supernovae 74 active galactic nuclei 74 GRBs 74 galaxy clusters 73 supermassive black holes 72 X ray emission 72 neutron stars 71 brown dwarfs 71 AGNs 71 distant quasars 71 gamma ray bursts 70 elliptical galaxies 70 supermassive black hole 70 magnetar 70 supernovas 70 pulsars 69 globular cluster 69 Milky Way galaxy 69 galaxy cluster 69 neutron star 69 dwarf galaxy 69 supernova explosion 68 elliptical galaxy 68 dwarf galaxies 68 Orion Nebula 67 starburst galaxy 67 gravitational waves 67 supernova explosions 67 redshift 67 starburst galaxies 67 distant galaxy 67 astronomical objects 67 astronomers 67 nebulae 67 luminous galaxies 67 protoplanetary disks 67 supernova 67 gamma ray burst 66 planetary nebulae 66 extrasolar planets 66 exoplanets 66 supernova remnant 66 blazars 66 Milky Way 66 planets 66 magnetars 66 X ray binary 66 brown dwarf 66 XMM Newton 65 merging galaxies 65 spiral galaxies 65 supernova remnants 65 X ray Observatory 65 protostars 65 comets 65 galaxy 65 Milky Way Galaxy 65 rocky planets 65 nebula 65 X ray telescopes 65 optical telescopes 64 accretion disk 64 protostar 64 Type Ia supernovae 64 redshifts 64 globulars 64 terrestrial planets 64 sunlike stars 64 pulsar 64 distant supernovae 64 novae 64 gamma rays 64 Andromeda galaxy 64 KBOs 64 SN #A 64 Eta Carinae 64 exoplanets orbiting 64 Crab Nebula 63 exoplanet 63 habitable planets 63 colliding galaxies 63 transiting planets 63 planetary nebula 63 X ray wavelengths 63 interstellar dust 63 WASP #b 63 protoplanetary disk 63 galactic mergers 63 distant quasar 63 gravitationally bound 63 Gamma ray bursts 63 HD #b [002] 63 millisecond pulsars 63 interstellar clouds 63 planets orbiting 62 type Ia supernovae 62 cosmic microwave background 62 Large Magellanic Cloud 62 gravitational radiation 62 red supergiant 62 Epsilon Eridani 62 supergiant star 62 galaxy formation 62 fainter objects 62 interstellar medium 62 faint galaxies 62 accretion disks 62 RS Ophiuchi 62 hot Jupiters 62 blazar 62 gravitational wave 62 gravitational lensing 62 cosmic rays 62 solar nebula 62 Type Ia supernova 61 GRB # 61 infrared wavelengths 61 SN #gy 61 extrasolar 61 AB Aurigae 61 Virgo Cluster 61 astrophysical 61 gamma ray 61 ULIRGs 61 neutrino 61 HD#b 61 proto galaxies 61 neutrinos 61 solar corona 61 Coma Cluster 61 Kuiper belt objects 61 Henize #-# 61 extragalactic 61 globular star 61 Astronomers 61 gamma ray emission 61 Evolution Explorer 61 eclipsing binary 61 magnetic fields 60 NASA Chandra 60 planemos 60 solar flares 60 type Ia supernova 60 transiting planet 60 X ray observatories 60 metallicity 60 supermassive 60 Kuiper belt 60 millisecond pulsar 60 X ray binaries 60 Milky Way halo 60 Andromeda Galaxy 60 super Earths 60 planet HD #b 60 spiral galaxy 60 GRB #B 60 giant elliptical galaxy 60 intrinsic brightness 60 Lyman alpha 60 gaseous planet 59 gravitational interactions 59 reionization 59 observable universe 59 Omega Centauri 59 Earthlike planets 59 WIMPs 59 planet orbiting 59 Red Rectangle 59 RXTE 59 celestial objects 59 red supergiants 59 Fermi telescope 59 microquasar 59 stellar nurseries 59 Hanny Voorwerp 59 Cygnus X 59 Small Magellanic Cloud 59 radial velocity 59 Cepheids 59 galaxy M# [002] 59 luminosities 59 Beta Pictoris b 59 cosmological distances 59 chondrules 59 V# Mon 59 GRB# 59 planetesimals 59 Active Galactic Nuclei 59 quark gluon plasma 59 distant galaxy clusters 59 astrophysicists 59 Virgo cluster 58 Type Ia supernovas 58 general relativity 58 baryons 58 planet orbits 58 energetic electrons 58 circumstellar disks 58 cosmic phenomena 58 supersymmetric particles 58 ejecta 58 Magellanic Clouds 58 Antennae Galaxies 58 proplyds 58 XTE J# 58 Wolf Rayet star 58 constellation Cassiopeia 58 axions 58 gravitational lenses 58 Hawking radiation 58 Beta Pictoris 58 galaxy NGC 58 Fomalhaut b 58 constellation Ursa Major 58 filamentary structure 58 GRB 58 GALEX 58 WMAP 58 blue supergiant 58 hypervelocity stars 58 Hubble observations 58 nebular 58 Spitzer Space Telescope 58 exoplanetary 58 ultraviolet wavelengths 58 ESA XMM Newton 58 Geminga 58 planets orbiting stars 57 Neutron stars 57 Galaxy Evolution 57 planets orbiting distant 57 G#.# +#.# 57 extrasolar planetary systems 57 Higgs particle 57 Kuiper Belt 57 active galactic nucleus 57 afterglows 57 Saturn rings 57 magnetic reconnection 57 constellation Centaurus 57 constellation Virgo 57 cosmic ray 57 ESO VLT 57 Cosmic Microwave Background CMB 57 star Gliese 57 comet 57 comet nucleus 57 ultraluminous galaxy 57 AU Mic 57 coronal mass ejections 57 positrons 57 supermassive stars 57 extrasolar planet 57 redshifted 57 Higgs bosons 57 Kuiper Belt Objects 57 Very Large Array 57 asteroids 57 Astrophysicists 57 planets circling 57 gamma ray flares 57 GJ #b [001] 57 visible wavelengths 57 orbiting Chandra 57 protoplanet 57 galactic cosmic rays 57 galactic nuclei 57 relativistic jets 57 RS Oph 57 interacting galaxies 57 sodium atoms 57 Oort Cloud 57 CMEs 57 spiral galaxy NGC 56 X ray observatory 56 HII regions 56 Supernovae 56 Epsilon Aurigae 56 brightnesses 56 accreting 56 jovian 56 Cosmologists 56 electron neutrinos 56 nucleosynthesis 56 infall 56 muons 56 gravitational microlensing 56 corona 56 Wolf Rayet stars 56 BP Psc 56 planets moons 56 Type Ia 56 sunlike star 56 foreground galaxy 56 optical wavelengths 56 galactic clusters 56 Hot Jupiters 56 photosphere 56 X ray pulses 56 distant supernovas 56 spectroscopic 56 spectroscopic observations 56 Gravitational waves 56 Upsilon Andromedae 56 interstellar dust clouds 56 masers 56 Type 1a supernovae 56 microlensing 56 celestial object 56 galactic collisions 56 constellation Taurus 56 NGC# 56 galactic halo 56 Magnetars 56 shorter wavelengths 56 Fornax cluster 56 Tarantula Nebula 56 optical spectra 56 KH #D 56 sunspots 56 Seyfert galaxies 56 spectra 56 NASA Wilkinson Microwave 56 Bullet Cluster 56 substorms 56 Comet Holmes 56 cluster NGC 56 nuclei 56 gaseous planets 56 protoplanets 56 submillimeter galaxies 56 Corot 9b 56 moonlets 56 magnetosphere 56 CMB radiation 56 barred spiral galaxy 56 HD# [002] 56 fainter 56 GeV 56 CAIs 56 Arches Cluster 56 spiral nebulae 56 galaxies collide 56 X ray emitting 56 microlensing events 55 constellation Sagittarius 55 TGFs 55 supernovae explosions 55 cosmological 55 UDFy # 55 meteoroids 55 giant elliptical galaxies 55 ionized gas 55 subatomic particles 55 Orion nebula 55 star Fomalhaut 55 SMBH 55 gravitational lens 55 coronagraph 55 CoRoT 7b 55 SDSS II 55 auroral 55 Triangulum Galaxy 55 TrES 4 55 Bok globules 55 telescopes 55 sterile neutrino 55 energetic gamma rays 55 supergiant stars 55 Cat Paw Nebula 55 occultations 55 starbursts 55 cosmologists 55 Alfven waves 55 axion 55 Trifid Nebula 55 Kuiper Belt object 55 Mpc 55 Solar System 55 Lagoon Nebula 55 X ray afterglow 55 astrophysical phenomena 55 galaxy M# [001] 55 Oort cloud 55 COROT 55 circumstellar 55 muon neutrinos 55 high redshift galaxies 55 dwarf spheroidal galaxies 55 gravitationally 55 WMAP satellite 55 photons 55 GJ#b 55 atoms 55 galactic cores 55 RHESSI 55 lensing galaxy 55 chemical abundances 55 brightest supernova 55 Keck telescope 55 gamma ray observatory 55 Kepler #b 55 constellation Hercules 55 hypernova 55 GJ #b [002] 55 J# +# [002] 55 HAT P 55 Mimas 55 noctilucent clouds 55 2MASS 55 relativistic particles 55 HL Tau 55 exo planet 54 orbits 54 Enceladus 54 exo planets 54 circumstellar disk 54 Proxima Centauri 54 supernova SN 54 constellation Carina 54 intracluster 54 Earths orbiting 54 transiting exoplanets 54 VY Canis Majoris 54 SN #C 54 auroras 54 luminosity 54 Cosmic rays 54 planet WASP #b 54 rotating neutron stars 54 galaxy NGC# 54 solitons 54 Saturn aurora 54 Pegasi 54 Elliptical galaxies 54 Carina Nebula 54 moonlet 54 cosmic ray particles 54 Voorwerp 54 Kuiper Belt objects 54 eccentric orbits 54 ionized hydrogen 54 HIP #b 54 XMM Newton observations 54 antimatter particles 54 faraway galaxies 54 reflection nebula 54 Galilean moons 54 Wilkinson Microwave Anisotropy Probe 54 SN#A 54 spacetime 54 spherically symmetric 54 phyllosilicates 54 SDSS 54 GRB #A 54 Cancri e 54 Fomalhaut 54 interstellar cloud 54 orbiting planets 54 Zeta Ophiuchi 54 Kuiper belt object 54 astrophysical objects 54 cosmological theories 54 Coma cluster 54 Betelgeuse 54 TrES 54 HM Cancri 54 WM Keck Observatory 54 ESO Very Large Telescope 54 high temperature superconductivity 54 neutralinos 53 earthlike planets 53 Dwarf galaxies 53 gamma ray photons 53 P/# A2 53 elliptical galaxy NGC 53 magnetospheric 53 Bug Nebula 53 exoplanet orbiting 53 substorm 53 telescope 53 detect gravitational waves 53 antineutrinos 53 Dumbbell Nebula 53 CoRoT #b 53 Saturn magnetosphere 53 protoplanetary 53 baryon 53 RRATs 53 Adam Riess 53 Corot 7b 53 infalling 53 starlight 53 submillimeter wavelengths 53 constellation Vulpecula 53 gamma ray bursts GRBs 53 #gy 53 sun corona 53 GQ Lupi 53 Chandra X ray 53 excitons 53 constellation Cygnus 53 SN #E 53 planets orbits 53 Comet Hale Bopp 53 subatomic particle 53 muon 53 Cepheid variables 53 carbonaceous chondrites 53 radial velocity method 53 potentially habitable planets 53 icy moons 53 galaxy redshift 53 moons 53 galactic disk 53 wavelengths 53 Wolszczan 53 celestial bodies 53 constellation Lyra 53 constellation Pegasus 53 Harvard Smithsonian 53 Earth magnetosphere 53 inhabitable planets 53 PKS #-# 53 gamma ray burst GRB 53 Leonids 53 Perseus Cluster 53 cosmic microwave radiation 53 habitable zones 53 Very Large Telescope 53 protoplanetary discs 53 neutrino particles 53 coronal loops 53 extrasolar planets orbiting 53 cosmic ray collisions 53 Stephan Quintet 53 SCP #F# 53 Supermassive black 53 Gliese #d 53 weakly interacting 53 weak gravitational lensing 53 elongated orbits 53 PSR J# 53 superfluid 53 Comet Tempel Tuttle 53 Alfvén waves 53 ULP cepheids 52 Cosmic Microwave Background 52 particles WIMPs 52 Hale Bopp 52 Anisotropy Probe WMAP 52 astronomer 52 tau neutrinos 52 ESO telescope 52 baryonic 52 HUDF 52 Astrophysical 52 Supernova #A 52 unaided eye 52 comets orbiting 52 Rosette Nebula 52 cosmic cannibal 52 impactors 52 electrons 52 permanently shadowed craters 52 outer planets 52 Saturn auroras 52 Globular clusters 52 spinning neutron stars 52 Big Bang 52 binary asteroid 52 submillimeter 52 Fermi Gamma ray 52 highly elliptical orbits 52 SNe Ia 52 MG J# +# 52 VHE gamma rays 52 Gamma rays 52 Eagle Nebula 52 SN #D 52 particle acceleration 52 CoRoT satellite 52 SNe 52 faintest galaxies 52 exoplanetary systems 52 lunar crust 52 Anisotropy Probe 52 planetary embryos 52 Higgs boson 52 binary quasar 52 chromosphere 52 aurorae 52 Saturn moons 52 Trojan asteroids 52 spectroscopic measurements 52 lavas 52 planets astronomers 52 Carina constellation 52 millimeter wavelengths 52 Galilean satellites 52 Pieter van Dokkum 52 Martian meteorites 52 ROSAT 52 Gliese #c 52 Pluto Charon 52 magma ocean 52 galactic bulge 52 spatially resolved 52 particle detectors 52 interferometry 52 gravitational 52 CoRoT 52 Io Europa 52 Gliese #g 52 circular orbits 52 aurora 52 Saturnian moon 52 astronomical observations 52 dense clumps 52 moon Io 52 Earthlike 52 Late Heavy Bombardment 52 atomic nuclei 52 carbonate minerals 52 WHIM 52 photometry 52 BP Piscium 52 dust enshrouded 52 Galaxies 52 star Beta Pictoris 52 asteroid belt 52 suns 52 Komossa 52 dense neutron stars 52 SNR #-#.# 52 bolometers 52 dirty snowballs 52 CoRoT 9b 52 Maunder minimum 52 z ~ 52 gravitationally lensed 52 exosolar planets 52 Extraterrestrial Physics 52 cosmic strings 52 coronal mass ejection 52 periodic oscillations 52 Microlensing 52 Jupiter Saturn Uranus 51 emission nebula 51 helium atoms 51 constellation Aquila 51 polarimetry 51 Grillmair 51 VLBA 51 UVOT 51 Area Telescope LAT 51 moon Ganymede 51 radial velocity technique 51 HARPS spectrograph attached 51 HIRES spectrometer 51 SNfactory 51 Einstein theory 51 extrasolar planetary 51 DEEP2 51 Lyrids 51 X ray photons 51 periodic dimming 51 heliosphere 51 silicates 51 proto planetary disk 51 antiprotons 51 VLTI 51 particles emitted 51 geoneutrinos 51 constellation Cetus 51 atomic particles 51 infrared radiation 51 Gamma ray 51 constellation Coma Berenices 51 Epsilon Indi 51 Space Telescope 51 SUSY 51 constellation Aquarius 51 Earth ionosphere 51 OGLE 51 Sedna 51 collisional 51 spectroscopically 51 gravitational interaction 51 moons orbiting 51 LOFAR 51 SMBHs 51 OGLE TR #b 51 Optical Gravitational Lensing Experiment 51 energetic cosmic rays 51 organic molecules 51 earthshine 51 Earthlike planet 51 hydrogen helium 51 Delta Cephei 51 dusty disks 51 OGLE TR 51 habitable worlds 51 particle accelerators 51 Jupiter moon Io 51 CMB photons 51 sized planets orbiting 51 Geminids 51 trans Neptunian objects 51 proton proton collisions 51 mu Arae 51 Puppis 51 ultraviolet radiation emitted 51 cosmos 51 lightwaves 51 Cygnus Lyra region 51 ionosphere 51 Doppler shifts 51 maser emission 51 submillimetre 51 alien civilizations 51 electron volts 51 exosphere 51 Orionids 51 proton collisions 51 Herschel telescope 51 Helix Nebula 51 W boson 51 olivine 51 planet transits 51 galactic 51 rubidium atoms 51 De Pontieu 51 interferometers 51 planets orbiting sun 51 Venusian atmosphere 51 dynamical evolution 51 diffuse aurora 51 CLG J# # 51 spicules 51 LIGO 51 polaritons 51 Ring Nebula 51 Pleiades cluster 51 Spitzer infrared spectrograph 51 HD# [005] 51 Filippenko 51 sparticles 51 Gravitational lensing 51 Sagittarius B2 50 mantle plumes 50 Trapezium 50 B mesons 50 cosmic gamma rays 50 Monoceros 50 retrograde orbits 50 Cancri 50 planet Uranus 50 coronal loop 50 RX J# 50 TW Hydrae 50 planetary nebulas 50 Pulsars 50 nebulas 50 icy comets 50 transiting exoplanet 50 Fermi LAT 50 NICMOS 50 Doradus 50 Gamma ray burst 50 superbubble 50 infalling gas 50 meteorites 50 cometary material 50 Richard Mushotzky 50 Gliese 50 VISTA telescope 50 PSR B# +# 50 chondrites 50 Toutatis 50 hematite mineral 50 fermions 50 globular cluster M# 50 Gehrels 50 BLG #Lb 50 HARPS instrument 50 Submillimeter Array 50 asteroidal 50 supersymmetry 50 numerical simulations 50 proto cluster 50 stellar occultations 50 coronal mass ejections CMEs 50 HD #b [001] 50 Kuiper Belt Object 50 Solar flares 50 interstellar molecules 50 moon Enceladus 50 protons 50 cosmological parameters 50 ray Space Telescope 50 planetary transits 50 interstellar space 50 Helix nebula 50 star Proxima Centauri 50 zodiacal light 50 particles 50 R#a# 50 Cosmic Evolution 50 meteoritic material 50 Digitized Sky Survey 50 spherules 50 Carinae 50 Gal Yam 50 baryonic matter 50 silicon monoxide 50 type 1a supernovae 50 Mauna Kea Hawaii 50 fermion 50 gamma rays emitted 50 occultation 50 Perseids 50 coronal holes 50 planetary orbits 50 Comet Halley 50 Hipparcos 50 noctilucent 50 Keck Interferometer 50 Keck Telescope 50 boson 50 asteroids comets 50 submillimetre wavelengths 50 Gondolo 50 J#.# [001] 50 comets asteroids 50 infrared telescopes 50 quantum gravity 50 quarks 50 planetoids 50 tholins 50 redshift z = 50 NEAs 50 TNOs 50 SWIFT J#.# 50 photons emitted 50 Bose Einstein condensates 50 proton antiproton collisions 50 SIRTF 50 protons collide 50 antiparticle 50 IRAS 4B 50 antiparticles 50 silicate dust 50 ESO PR 50 Butterfly Nebula 50 detect gamma rays 50 Extrasolar planets 50 phonons 49 exoplanets planets 49 Keck telescopes 49 plasmons 49 Sara Seager 49 Halley comet 49 Canes Venatici 49 nebulosity 49 Infrared Thermal Imaging Spectrometer 49 gravitational tides 49 retrograde orbit 49 neutrino beam 49 diffraction pattern 49 stellar occultation 49 primitive meteorites 49 spectroscopy 49 zodiacal dust 49 moon Charon 49 laser pulses 49 eclipsing binaries 49 celestial phenomena 49 bosonic 49 interstellar dust grains 49 Gliese #e 49 infrared observatory 49 Perseus cluster 49 asteroid 49 infrared spectra 49 kaons 49 circumstellar dust 49 Pleiades 49 proto planetary disks 49 ultracold atoms 49 interferometric 49 supercontinent 49 arcminutes 49 Bose Einstein condensate 49 electron 49 oscillations 49 neutrons 49 abundances 49 David Spergel 49 inhomogeneities 49 southern constellation Carina 49 PZ Tel 49 Voyager spacecraft 49 cometary 49 neutral mass spectrometer 49 Astrophysical Journal 49 constellation Eridanus 49 Ulysses spacecraft 49 galaxies quasars 49 R Coronae Borealis 49 universe 49 magnetic monopoles 49 Crab Pulsar 49 stellar seismology 49 Ordovician extinction 49 spacecraft flyby 49 multiband imaging photometer 49 galactic nucleus 49 explosive eruptions 49 Cassini ion 49 ringed planet 49 gravitational perturbations 49 planet HD#b 49 Mandushev 49 photon 49 hydrated minerals 49 Cassini 49 cosmic particles 49 elliptical orbits 49 helium nuclei 49 SINFONI 49 SN Ia 49 Werthimer 49 smallest exoplanet 49 Alex Filippenko 49 solar prominences 49 Neil Gehrels 49 electronvolts 49 isotopic 49 Quaoar 49 magnetotail 49 extraterrestrial civilizations 49 spatial dimensions 49 dusty cocoons 49 Vikhlinin 49 deuterium 49 galaxy supermassive black 49 innermost planet 49 polar vortex 49 SN #cr 49 NASA Fermi Gamma 49 solar radii 49 Quadrantid meteor shower 49 Laser Interferometer Gravitational Wave 49 dynamical 49 planetary Transits 49 spectrographs 49 Scorpii 49 RY Sagittarii 49 Kazantzidis 49 supernova remnant Cassiopeia 49 supergiants 49 ESA Integral 49 adaptive optics 49 constellation Libra 49 superclusters 49 attosecond 49 constellation Andromeda 49 gamma ray emitting 49 Infrared Array Camera 49 VB #b 49 baryon acoustic oscillations 48 Haumea 48 blue straggler 48 Paranal Chile 48 colliders 48 volcanism 48 Earth asteroids 48 gravitational pulls 48 constellation Puppis 48 x ray pulses 48 Carnegie Observatories 48 Iapetus 48 constellation Auriga 48 spectral fingerprints 48 Planetary nebulae 48 meteorite impacts 48 muon neutrino 48 Saturn moon Enceladus 48 occulted 48 thermonuclear reactions 48 Type 1a supernova 48 synchrotron emission 48 antimatter 48 supercontinents