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(Click for frequent words.) 79 supermassive black holes 77 neutron star 75 galaxies 74 quasar 72 accretion disk 71 dwarf galaxy 71 X ray emission 71 Milky Way galaxy 70 quasars 70 elliptical galaxy 70 galaxy 70 supernova explosion 70 galaxy cluster 69 active galactic nuclei 69 pulsar 68 galaxy clusters 68 Eta Carinae 67 magnetar 67 Milky Way Galaxy 67 neutron stars 67 dwarf galaxies 67 protostar 67 protoplanetary disk 66 Milky Way 66 supernovae 66 nebula 66 globular cluster 66 distant galaxies 66 distant galaxy 66 GRBs 66 gamma ray burst 65 supernova 65 Wolf Rayet star 65 globular clusters 65 starburst galaxy 65 merging galaxies 65 spiral galaxies 65 supernova remnant 64 brown dwarf 64 supernova explosions 64 gravitationally 64 gamma rays 64 spiral galaxy 63 HD #b [002] 63 giant elliptical galaxy 63 galaxy NGC 63 red supergiant 63 starburst galaxies 63 interstellar medium 63 Andromeda galaxy 63 colliding galaxies 62 elliptical galaxies 62 Large Magellanic Cloud 62 X ray binary 62 accretion disks 62 gravitationally bound 62 interstellar clouds 62 GRB # 62 active galactic nucleus 62 protostars 62 WASP #b 61 planetary nebula 61 supergiant star 61 microquasar 61 ejecta 61 galactic mergers 61 millisecond pulsar 61 supermassive 61 Orion Nebula 61 blue supergiant 61 SN #gy 61 accreting 61 X ray emitting 61 Type Ia supernova 61 AGNs 61 pulsars 60 gamma ray bursts 60 HD#b 60 Virgo Cluster 60 infall 60 blazar 60 planet HD #b 60 gravitational waves 60 blazars 60 planet orbits 60 SN #A 60 ionized gas 60 circumstellar disk 60 brown dwarfs 60 relativistic particles 60 planet orbiting 60 planetary nebulae 60 globulars 60 galactic disk 60 supernova remnants 60 quark gluon plasma 60 rocky planets 60 Virgo cluster 59 gamma ray emission 59 Enceladus 59 supernovas 59 galaxy M# [002] 59 infalling 59 Andromeda Galaxy 59 RS Ophiuchi 59 Fomalhaut b 59 comet 59 magnetic fields 59 planets 59 galactic halo 59 stellar nurseries 59 magnetic reconnection 59 circumstellar disks 59 Arches Cluster 59 comets 59 gravitational interaction 58 red supergiants 58 Oort Cloud 58 coronal mass ejection 58 exoplanets 58 Crab Nebula 58 constellation Sagittarius 58 magnetosphere 58 Small Magellanic Cloud 58 planets orbiting 58 positrons 58 Earth magnetosphere 58 comet nucleus 58 GRB #B 58 protoplanetary disks 58 afterglows 58 planetesimals 58 solar corona 58 gravitational radiation 58 exoplanet 58 solar nebula 58 circumstellar 57 interstellar dust 57 galactic clusters 57 GeV 57 neutrino 57 Bullet Cluster 57 transiting planet 57 cosmic rays 57 moonlets 57 SMBH 57 X ray wavelengths 57 blue straggler 57 Omega Centauri 57 photosphere 57 gravitational interactions 57 type Ia supernova 57 ULIRGs 57 Coma Cluster 57 exoplanets orbiting 57 superfluid 57 atoms 57 CoRoT 7b 56 celestial object 56 nebular 56 galaxies collide 56 BP Psc 56 protoplanets 56 sodium atoms 56 Oort cloud 56 X ray Observatory 56 observable universe 56 star Gliese 56 VY Canis Majoris 56 redshifted 56 WIMPs 56 Upsilon Andromedae 56 terrestrial planets 56 GRB 56 constellation Ursa Major 56 orbiting planets 56 interstellar cloud 56 HM Cancri 56 extrasolar planets 56 TrES 4 56 constellation Cassiopeia 56 eclipsing binary 56 HD# [002] 56 V# Mon 56 galactic cores 56 particles 56 XTE J# 56 SN#A 56 constellation Hercules 56 neutrons 56 elongated orbits 56 planets orbits 56 Milky Way halo 56 Antennae Galaxies 56 interacting galaxies 56 Henize #-# 56 Corot 9b 56 Gravitational waves 56 Type Ia supernovae 56 neutrinos 56 Kuiper belt 56 GQ Lupi 56 Magellanic Clouds 56 HL Tau 56 Hot Jupiters 56 Neutron stars 55 Beta Pictoris 55 Sagittarius B2 55 GJ #b [002] 55 Epsilon Eridani 55 nuclei 55 redshift 55 elliptical galaxy NGC 55 gaseous planet 55 magnetars 55 hot Jupiters 55 radial velocity 55 antimatter particles 55 proton 55 torus 55 PSR J# 55 infalling gas 55 atomic nuclei 55 GRB# 55 GJ#b 55 Tarantula Nebula 55 moonlet 55 GJ #b [001] 55 sunlike star 55 Corot 7b 55 proto galaxies 55 distant supernovae 55 coronal mass ejections 55 Gamma ray bursts 55 Saturnian moon 55 substorm 55 spiral galaxy NGC 55 constellation Virgo 55 Saturn magnetosphere 55 emission nebula 55 Supernova #A 55 planet WASP #b 55 constellation Aquarius 55 giant elliptical galaxies 55 subatomic particles 55 nebulae 55 Bok globules 54 moon Enceladus 54 galactic cosmic rays 54 electron neutrinos 54 AU Mic 54 Red Rectangle 54 Geminga 54 protoplanet 54 habitable planets 54 electrons 54 extrasolar planet 54 Supernovae 54 galactic bulge 54 hypervelocity stars 54 constellation Carina 54 infalling matter 54 Hanny Voorwerp 54 galaxy formation 54 oppositely directed 54 Zeta Ophiuchi 54 spacetime 54 muons 54 AB Aurigae 54 gamma ray flares 54 Fermi telescope 54 Beta Pictoris b 54 X ray pulses 54 luminous galaxies 54 vortices 54 X ray binaries 54 galaxy M# [001] 54 SN #C 54 gravitational 54 transiting planets 54 Gamma rays 54 J# +# [002] 54 superdense 54 millisecond pulsars 54 constellation Centaurus 53 Carina Nebula 53 orbits 53 star Fomalhaut 53 runaway thermonuclear 53 Hawking radiation 53 Kuiper Belt 53 distant quasars 53 protoplanetary discs 53 Bug Nebula 53 cosmic ray 53 foreground galaxy 53 brightest supernova 53 Orion nebula 53 lensing galaxy 53 globular star 53 XMM Newton 53 proplyds 53 ionized hydrogen 53 eccentric orbits 53 corona 53 circular orbits 53 polar vortex 53 energetic electrons 53 super Earths 53 baryon 53 Evolution Explorer 53 axions 53 astronomers 53 metallicity 53 neutralinos 53 hypervelocity star 53 galactic 53 distant quasar 53 Iapetus 53 Fornax cluster 53 Voorwerp 53 X ray telescopes 53 Seyfert galaxies 53 helium atoms 53 cluster NGC 53 NGC# 53 comets orbiting 53 HIP #b 53 protons 53 SN #D 53 gravitational tug 53 cosmological distances 53 antiprotons 52 fainter objects 52 icy moons 52 Active Galactic Nuclei 52 extragalactic 52 filamentary structure 52 muon neutrinos 52 Pegasi 52 sunlike stars 52 spinning neutron 52 cosmic ray particles 52 Venusian atmosphere 52 planemos 52 Cygnus X 52 particle acceleration 52 substorms 52 ionised 52 optical wavelengths 52 fainter 52 jovian 52 Proxima Centauri 52 gamma ray 52 rotating neutron 52 superdense neutron star 52 solar flares 52 tidal tails 52 magnetotail 52 Doradus 52 excitons 52 exoplanet orbiting 52 subatomic particle 52 meteoroids 52 extrasolar 52 coronal loop 52 Bose Einstein condensate 52 Gliese #c 52 photons 52 Gliese #e 52 gamma rays emitted 52 Earthlike planets 52 hypernova 52 RXTE 52 maser emission 52 magma ocean 52 Kepler #b 52 Cepheid variable 52 chondrules 52 Perseus cluster 52 electron 52 Saturn moon Enceladus 52 type Ia supernovae 52 astronomical objects 52 deuterium atoms 52 auroral 52 helium nuclei 52 Cancri 52 rubidium atoms 52 supernovae explosions 52 gravitational tides 51 Trifid 51 thermonuclear explosion 51 constellation Vulpecula 51 MG J# +# 51 Type 1a supernovae 51 HD #b [001] 51 filamentary structures 51 reflection nebula 51 constellation Cetus 51 gravitational lens 51 retrograde orbit 51 filaments 51 Rosette Nebula 51 masers 51 novae 51 baryonic 51 emits X rays 51 chromosphere 51 cosmic ray collisions 51 gravitational attraction 51 Triangulum 51 infrared wavelengths 51 NASA Chandra 51 Earths orbiting 51 barred spiral galaxy 51 CoRoT 9b 51 SN #E 51 CMEs 51 ionized particles 51 weakly interacting 51 Hubble observations 51 Carina constellation 51 interstellar dust clouds 51 Saturn rings 51 gaseous 51 VHE gamma rays 51 starbursts 51 sun corona 51 constellation Taurus 51 Cat Paw Nebula 51 Supermassive black 51 star Proxima Centauri 51 RS Oph 51 Eagle Nebula 51 RHIC 51 Comet Tempel Tuttle 51 magma 51 ultraviolet wavelengths 51 magnetospheric 51 relativistic jets 51 R#a# 51 supermassive stars 51 Solar System 51 astrophysical 51 G#.# +#.# 51 interstellar space 51 moon Mimas 51 exoplanetary 51 shorter wavelengths 51 X ray afterglow 51 planets moons 51 icy comets 51 spherically symmetric 51 Lagoon Nebula 51 redshifts 51 gamma ray observatory 51 galactic nuclei 51 NGC #A 51 asteroid belt 51 muon 51 HII regions 51 Saturn auroras 51 atomic nucleus 51 Fomalhaut 51 heliosphere 51 constellation Perseus 51 Planetary nebulae 51 Alfvén waves 51 Trifid Nebula 51 antiparticle 50 hydrogen atoms 50 suns 50 particle 50 CoRoT #b 50 gravitational wave 50 Upsilon Andromedae b 50 innermost planet 50 reionization 50 habitable zones 50 Type Ia 50 exosphere 50 volcanic moon Io 50 rotating neutron stars 50 asteroids 50 PZ Tel 50 PKS #-# 50 Cosmic rays 50 Puppis 50 distant galaxy clusters 50 Sedna 50 Higgs bosons 50 Comet Holmes 50 Type Ia supernovas 50 crystalline silicates 50 SMBHs 50 constellation Pegasus 50 planets circling 50 HAT P 50 Wolf Rayet stars 50 Betelgeuse 50 mesosphere 50 atomic particles 50 cosmic microwave background 50 Galaxy Evolution 50 Epsilon Aurigae 50 antiparticles 50 SNR #-#.# 50 outer layers 50 moons orbiting 50 high redshift galaxies 50 galaxy NGC# 50 exo planets 50 binary quasar 50 star Beta Pictoris 50 Komossa 50 PSR B# +# 50 galactic collisions 50 R Coronae Borealis 50 Mpc 50 gravitational microlensing 50 ionised gas 50 visible wavelengths 50 Magnetars 50 Jupiter moon Io 50 energetic gamma rays 50 cosmic cannibal 50 supergiant stars 50 antineutrinos 50 constellation Scorpius 50 gravitational pull 50 W boson 50 ray Space Telescope 50 transiting exoplanet 50 phonons 50 protoplanetary 50 highly magnetized neutron 50 alpha particles 50 KBOs 50 orbiting 50 highly collimated 50 protons collide 50 spicules 50 Helix Nebula 50 Kuiper belt objects 50 planetoid 50 constellation Leo 50 starlight 50 CMB radiation 50 Higgs particle 50 Cancri e 50 Spitzer Space Telescope 50 proton proton collisions 50 Lyman alpha 50 potassium atoms 49 Schwarzschild radius 49 TrES 49 galaxy supermassive black 49 Galaxies 49 TGFs 49 water vapor 49 Wolszczan 49 silicon monoxide 49 supersymmetric particles 49 extrasolar planetary 49 Triangulum Galaxy 49 HD# [005] 49 nucleosynthesis 49 dense neutron stars 49 Saturn moons 49 molten magma 49 emit X rays 49 aurorae 49 #gy 49 Astrophysics Cambridge Mass. 49 X ray photons 49 gravitational lensing 49 Chi Cygni 49 noctilucent clouds 49 supernova SN 49 planets orbiting stars 49 astrophysicists 49 ESA XMM Newton 49 rotational axis 49 lithium atoms 49 spherical halo 49 coronal mass ejections CMEs 49 energetic cosmic rays 49 constellation Gemini 49 proton collisions 49 gamma ray bursts GRBs 49 sterile neutrino 49 chemical abundances 49 Kuiper Belt object 49 magnetic monopoles 49 SCP #F# 49 planets orbiting distant 49 hadrons 49 cosmic microwave radiation 49 molten rock 49 neighboring Andromeda galaxy 49 Sagittarius dwarf galaxy 49 BP Piscium 49 Saturnian system 49 dwarf spheroidal galaxies 49 Mandushev 49 constellation Cygnus 49 CoRoT 49 Bose Einstein condensates 49 supernova remnant Cassiopeia 49 Butterfly Nebula 49 electron volts 49 gaseous planets 49 particles WIMPs 49 spinning pulsar 49 VB #b 49 positron 49 axion 49 comet Tempel 1 49 VLTI 49 comet Tempel Tuttle 49 photon 49 Cepheids 49 asteroid 49 Jupiter magnetosphere 49 luminosities 49 Stephan Quintet 49 convective 49 bosonic 49 meteoritic material 49 Perseus Cluster 49 Kuiper Belt objects 49 infrared radiation 49 meteoroid 49 supergiant 49 subatomic 49 exoplanetary systems 49 gravitational tugs 49 TW Hydrae 49 tidally 49 Earth magnetotail 48 Gliese #d 48 colliding protons 48 planet magnetosphere 48 Crab Pulsar 48 moon Io 48 P/# A2 48 particles emitted 48 laser pulse 48 moon Ganymede 48 CAIs 48 pyroclastic flow 48 auroras 48 submillimeter galaxies 48 Type 1a supernova 48 intrinsic brightness 48 planet transits 48 constellation Coma Berenices 48 Keck Interferometer 48 elliptical orbits 48 comet McNaught 48 Alfven waves 48 angular momentum 48 Beehive Cluster 48 electron beams 48 spiral galaxy M# 48 X ray observatory 48 Microlensing 48 Neil Gehrels 48 Harvard Smithsonian 48 GALEX 48 dense clumps 48 proto planetary disk 48 highly elliptical orbits 48 CMB photons 48 proton antiproton collisions 48 z ~ 48 ultraluminous galaxy 48 Gemini constellation 48 constellation Lyra 48 intracluster 48 stellar occultation 48 Comet Hale Bopp 48 proto planetary disks 48 proto cluster 48 Circinus X 1 48 Io volcanoes 48 smallest extrasolar planet 48 mantle plumes 48 optical telescopes 48 spectroscopically 48 De Pontieu 48 J#.# [001] 48 BLG #Lb 48 silicate dust 48 tidal bulge 48 Astronomers 48 deuterium 48 cometary debris 48 Kuiper belt object 48 millimeter wavelength 48 glows brightly 48 planet Uranus 48 interstellar particles 48 thermonuclear reactions 48 constellation Puppis 48 Saturn aurora 48 gamma ray emitting 48 extrasolar planetary systems 48 fermion 48 Trojan asteroids 48 hydrogen atom 48 Scheila 48 microlensing 48 antihelium 4 48 comet Hale Bopp 48 planet HD#b 48 NASA Cassini spacecraft 48 Pluto Charon 48 UDFy # 48 elongated orbit 48 outer planets 48 submillimeter 48 supersolid 48 X ray observatories 48 Mimas 48 magnetopause 48 cosmic phenomena 48 Earthlike planet 48 Comet Hartley 48 Sgr 48 cosmic ray protons 48 Comet Hartley 2 47 brightnesses 47 SUSY 47 asteroidal 47 permanently shadowed craters 47 ultracold 47 Ulysses spacecraft 47 Fermi LAT 47 undiscovered particle 47 impactors 47 extrasolar planets orbiting 47 planetesimal 47 Kuiper Belt Objects 47 helium ions 47 polaritons 47 Bose Einstein Condensate 47 muon neutrino 47 Goldilocks planet 47 Galilean moons 47 periodic dimming 47 nucleon 47 pions 47 circumstellar dust 47 Orion constellation 47 sized planets orbiting 47 ESA Integral 47 KH #D 47 faint galaxies 47 constellation Ophiuchus 47 plasmons 47 kaons 47 antihydrogen 47 Astrophysical 47 infrared photons 47 LIGO 47 dust enshrouded 47 luminosity 47 constellation Andromeda 47 heliopause 47 Leonids 47 Ophiuchi 47 Galileo spacecraft 47 BLG #L 47 Toutatis 47 magnetic flux 47 collisional 47 gravitons 47 undersea volcanoes 47 prograde 47 Magellanic Stream 47 gamma ray astronomy 47 carbonate minerals 47 cosmic particles 47 nebulosity 47 ringed planet 47 Saturn outermost 47 helium atom 47 spatially resolved 47 gluons 47 ion collisions 47 comet Wild 47 exciton 47 gravity warps 47 binary asteroid 47 heliosheath 47 V# Sgr 47 baryons 47 occultations 47 cometary 47 Yellowstone supervolcano 47 strangelets 47 airbursts 47 planet gravitational tug 47 cosmic dust 47 Earth radii 47 diffuse aurora 47 inhabitable planets 47 wavefunction 47 microlensing events 47 Gliese #g 47 cryovolcanism 47 electroweak 47 radial velocity method 47 Jovian moon 47 lightwaves 47 cosmic strings 47 impactor 47 electron positron 47 earthlike planets 47 galactic nucleus 47 fading afterglow 47 Astrophysicists 47 SEGUE 47 antiproton 47 volcanic plume 47 hydrogen nuclei 47 Gliese 47 quantum particle 47 Very Large Array 47 PSR J# +# 47 potentially habitable planets 47 cometary material 47 Trapezium 47 comet tail 47 silicates 47 orbits Saturn 47 ultracold atoms 46 strange quark 46 dynamical 46 Comet Elenin 46 detect gamma rays 46 ionized gases 46 Grillmair 46 spectroscopic 46 collimated 46 gravitational wobble 46 rocky terrestrial planets 46 perihelion 46 constellation Aries 46 gravitationally lensed 46 IRAS #-# 46 galactic cannibalism 46 coronal holes 46 mesons 46 Andromeda Galaxy M# 46 astrophysical objects 46 relativistic protons 46 dusty disks 46 IRAS 4B 46 exosolar planets 46 relativistic speeds 46 Jupiter Saturn Uranus 46 ionizes 46 planet Gliese #g 46 Einstein cosmological constant 46 tholins 46 nanobubbles 46 faraway galaxies 46 sterile neutrinos 46 subsurface ocean 46 Comet Lulin 46 coronagraph 46 planets comets 46 NEAs 46 ionized 46 oxygen atoms 46 neutrino particles 46 cometary dust 46 stellar occultations 46 gamma ray radiation 46 ecliptic 46 high temperature superconductivity 46 fermions 46 Cassini ion 46 strangelet 46 Saturnian moons 46 impactor spacecraft 46 Crab pulsar 46 spacecraft flyby 46 Spitzer infrared spectrograph 46 WHIM 46 x ray beam 46 CoRoT satellite 46 filamentary 46 general relativity 46 weak gravitational lensing 46 galaxy redshift 46 comet dust 46 LHC experiments 46 Ring Nebula 46 Tarantula nebula 46 ionize 46 outer corona 46 cesium atoms 46 hydrothermal 46 globular cluster M# 46 faintest galaxies 46 thermosphere 46 nebula NGC 46 OGLE TR #b 46 superbubble 46 plasmon 46 Gravitational lensing 46 constellation Draco 46 Cassini spacecraft 46 Phaethon 46 SWIFT J#.# 46 periodic oscillations 46 Globular clusters 46 lunar perigee 46 ejecta blanket 46 sunspot 46 ESO telescope 46 Phoebe orbits 46 Tycho supernova remnant 46 proton proton 46 Saturn moon 46 OGLE TR 46 quantum mechanically 46 planet Gliese #c 46 radial velocity technique 46 Earth crust 46 diffraction pattern 46 NASA Voyager spacecraft 46 zodiacal light 46 constellation Aquila 46 spectra 46 Comet 9P/Tempel 1 46 Gal Yam 46 Brookhaven Relativistic Heavy 46 Goldilocks zone 46 dimers 46 ESO VLT 46 quantum superposition 46 Tempel 1 46 radioactive decay 46 SOHO spacecraft 46 NASA Fermi Gamma 46 habitable planet 46 planets astronomers 46 ESO PR 46 neutrino beam 46 moon Titan 46 NASA Wilkinson Microwave 46 planets orbiting sun 46 planetary transits 46 RHESSI 46 baryonic matter 46 dye molecules 46 bosons 46 quasiparticle 46 WMAP satellite 46 troposphere 46 dust particles 45 ultraviolet radiation emitted 45 distant supernovas 45 SDSS II 45 positronium atoms 45 particle detectors 45 hydroxyl molecules 45 auroral displays 45 cosmic magnifying glass 45 hydrogen helium 45 sunspots 45 southern constellation Carina 45 spirals inward 45 molecule 45 neutral mass spectrometer 45 COROT 45 velocity dispersion 45 Hyades cluster 45 Saturn outermost ring 45 solar neutrinos 45 Dumbbell Nebula 45 Epsilon Indi 45 spatial dimensions 45 RY Sagittarii 45 dipole moment 45 galactic magnetic 45 SMM J# 45 lava fountains 45 tidally locked 45 stellar seismology 45 electrons emitted 45 spinning neutron stars 45 attosecond 45 particle beams