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(Click for frequent words.) 77 galaxies 75 globular clusters 72 spiral galaxies 72 galaxy clusters 72 brown dwarfs 71 neutron stars 70 quasars 70 AGNs 70 starburst galaxies 70 X ray emission 70 active galactic nuclei 69 globular cluster 69 dwarf galaxies 69 protoplanetary disks 69 supernovae 69 luminous galaxies 69 distant galaxies 68 GRBs 68 galactic mergers 68 rocky planets 68 merging galaxies 68 galaxy cluster 67 KBOs 67 neutron star 67 gravitationally bound 67 elliptical galaxy 67 protostar 67 planetary nebulae 67 Type Ia supernovae 67 globulars 67 starburst galaxy 67 dwarf galaxy 67 supermassive black holes 67 protoplanetary disk 66 eclipsing binary 66 SN #gy 66 planets 66 Milky Way galaxy 66 supernova explosion 65 SN #A 65 type Ia supernovae 65 red supergiants 65 X ray binary 65 protostars 65 quasar 65 redshifts 65 brown dwarf 65 supermassive 65 ULIRGs 65 magnetars 65 red supergiant 65 distant quasars 65 WASP #b 65 nebula 65 gamma ray bursts 65 BP Psc 65 Hot Jupiters 65 supernova explosions 64 Kuiper belt objects 64 distant supernovae 64 Type Ia 64 Antennae Galaxies 64 Eta Carinae 64 type Ia supernova 64 supernova remnants 64 stellar nurseries 64 sunlike stars 64 galaxy formation 64 protoplanet 64 AB Aurigae 64 colliding galaxies 64 metallicity 64 distant galaxy 64 supernova 64 Milky Way Galaxy 64 Coma Cluster 64 magnetar 64 planet orbits 64 Andromeda galaxy 63 planemos 63 transiting planets 63 nebular 63 exoplanets orbiting 63 Kuiper belt 63 globular star 63 redshift 63 solar nebula 63 Milky Way 63 supernova remnant 63 accretion disks 63 intrinsic brightness 63 hot Jupiters 63 interstellar clouds 63 extrasolar 63 Orion Nebula 63 millisecond pulsars 63 giant elliptical galaxies 63 Type Ia supernova 63 planetary nebula 63 galaxies collide 63 terrestrial planets 62 Cepheids 62 supermassive black hole 62 X ray binaries 62 planet orbiting 62 galaxy 62 supernovas 62 planets orbiting 62 X ray wavelengths 62 HM Cancri 62 extrasolar planets 62 exoplanets 62 accretion disk 62 fainter objects 62 Neutron stars 62 novae 62 pulsars 62 Milky Way halo 62 icy moons 62 luminosities 62 interstellar cloud 62 super Earths 62 infall 61 interacting galaxies 61 nebulae 61 gamma rays 61 planets orbiting distant 61 gravitational interactions 61 millisecond pulsar 61 HD#b 61 galaxy M# [002] 61 reionization 61 Gravitational waves 61 neutralinos 61 protoplanetary discs 61 Beta Pictoris 61 Epsilon Eridani 61 Bullet Cluster 61 AU Mic 61 Earthlike planets 61 blue supergiant 61 Virgo cluster 61 Supernovae 61 SMBH 60 Wolf Rayet star 60 pulsar 60 baryons 60 galactic bulge 60 Magnetars 60 Gamma ray bursts 60 spiral galaxy 60 star Gliese 60 Henize #-# 60 Trifid Nebula 60 gamma ray emission 60 gaseous planet 60 Beta Pictoris b 60 HD #b [002] 60 SN#A 60 radial velocity 60 moonlets 60 circumstellar 60 SMBHs 60 chemical abundances 60 Orion nebula 60 chondrules 60 planets orbits 60 galaxy NGC 60 ejecta 60 galactic disk 60 Andromeda Galaxy 60 exoplanet orbiting 60 cosmological distances 60 nuclei 60 Hubble observations 60 planets circling 60 observable universe 60 galactic clusters 60 lensing galaxy 60 Arches Cluster 60 Type 1a supernovae 60 astronomers 60 proto galaxies 60 SDSS II 60 supermassive stars 60 distant galaxy clusters 60 constellation Ursa Major 60 astrophysical 59 TrES 4 59 gravitational lensing 59 blazars 59 Tarantula Nebula 59 Kuiper Belt objects 59 filamentary structure 59 phyllosilicates 59 exoplanet 59 habitable planets 59 gaseous planets 59 circumstellar disks 59 dynamical evolution 59 optical wavelengths 59 baryonic 59 constellation Cassiopeia 59 ionized hydrogen 59 asteroidal 59 Red Rectangle 59 planetary nebulas 59 supergiant stars 59 Epsilon Aurigae 59 Fornax cluster 59 Fomalhaut b 59 quark gluon plasma 59 supersymmetric particles 59 galactic cores 59 RS Ophiuchi 59 Saturn rings 59 gamma ray burst 59 planets orbiting stars 59 Evolution Explorer 59 astrophysicists 59 CoRoT 9b 58 eccentric orbits 58 Type Ia supernovas 58 foreground galaxy 58 Upsilon Andromedae 58 infrared wavelengths 58 Oort Cloud 58 proplyds 58 gravitational microlensing 58 gravitational radiation 58 planetesimals 58 extragalactic 58 brightnesses 58 axions 58 comet nucleus 58 barred spiral galaxy 58 Globular clusters 58 Omega Centauri 58 proto cluster 58 Cepheid variables 58 nucleons 58 elongated orbits 58 Carina Nebula 58 Lyman alpha 58 protoplanets 58 constellation Virgo 58 Hanny Voorwerp 58 spiral nebulae 58 comets 58 habitable zones 58 Kuiper Belt Objects 58 Higgs bosons 58 X ray telescopes 58 planet HD #b 58 atoms 58 planets orbiting sun 58 galaxy M# [001] 58 microquasar 58 ultraviolet wavelengths 58 galactic halo 58 Dwarf galaxies 58 BP Piscium 58 sunlike star 58 moons orbiting 58 circumstellar disk 58 X ray observatories 58 Crab Nebula 58 Virgo Cluster 58 distant quasar 58 gravitational lenses 57 noctilucent clouds 57 planetary embryos 57 Gliese #d 57 spatial dimensions 57 submillimeter galaxies 57 Wolf Rayet stars 57 GJ #b [001] 57 Kuiper Belt object 57 interstellar dust clouds 57 reflection nebula 57 Small Magellanic Cloud 57 dynamical 57 supergiant star 57 NGC# 57 Zeta Ophiuchi 57 lunar crust 57 masers 57 XMM Newton 57 blazar 57 active galactic nucleus 57 carbonaceous chondrites 57 RXTE 57 planetary orbits 57 spacetime 57 exo planets 57 constellation Centaurus 57 Corot 7b 57 dense clumps 57 cometary material 57 circular orbits 57 microlensing events 57 orbiting planets 57 antiparticles 57 Oort cloud 57 GJ#b 57 Bose Einstein condensates 57 intracluster 57 relativistic particles 57 gravitational waves 57 Spitzer Space Telescope 57 retrograde orbit 57 Corot 9b 57 Seyfert galaxies 57 exoplanetary 57 giant elliptical galaxy 57 trans Neptunian objects 57 hypervelocity stars 57 orbits 57 X ray Observatory 57 Cancri e 57 SN #C 57 positrons 57 sized planets orbiting 57 cosmic phenomena 57 emission nebula 56 spectroscopically 56 WIMPs 56 antiparticle 56 Elliptical galaxies 56 Cat Paw Nebula 56 quasicrystal 56 transiting planet 56 GALEX 56 faint galaxies 56 sodium atoms 56 cluster NGC 56 Large Magellanic Cloud 56 Geminga 56 HL Tau 56 elliptical galaxy NGC 56 dwarf spheroidal galaxies 56 baryonic matter 56 stellar seismology 56 nucleosynthesis 56 optical telescopes 56 Spiral galaxies 56 electrons orbiting 56 constellation Hercules 56 X ray pulses 56 electron neutrinos 56 Kepler #b 56 gravitationally 56 Type 1a supernova 56 Magellanic Clouds 56 GRB # 56 GQ Lupi 56 Kuiper Belt 56 Eagle Nebula 56 supergiants 56 baryon 56 interstellar medium 56 Cepheid variable 56 astrophysical phenomena 56 astronomical objects 56 Pieter van Dokkum 56 Galaxy Evolution 56 astrophysical objects 56 Astronomers 56 sunspots 56 chondrites 56 Bok globules 56 SNe 56 Coma cluster 56 cosmic microwave background 56 G#.# +#.# 56 elliptical orbits 56 antimatter particles 56 crystalline silicates 56 magnetic reconnection 56 particles WIMPs 56 Gliese #c 56 planets moons 56 Kuiper belt object 56 Higgs particle 56 binary asteroid 56 W boson 55 V# Mon 55 planetesimal 55 shorter wavelengths 55 spiral galaxy NGC 55 photosphere 55 Bose Einstein condensate 55 microlensing 55 ionized gas 55 P/# A2 55 magnetic fields 55 supernova SN 55 SN #E 55 aurorae 55 spectra 55 planet WASP #b 55 interstellar dust 55 cosmological 55 RS Oph 55 WMAP 55 bosonic 55 superfluid 55 afterglows 55 CAIs 55 spectroscopic 55 cosmological theories 55 zodiacal light 55 NASA Chandra 55 abundances 55 spherically symmetric 55 R Coronae Borealis 55 constellation Sagittarius 55 accreting 55 Extrasolar planets 55 cosmologists 55 Betelgeuse 55 protoplanetary 55 Wolszczan 55 Alfvén waves 55 CoRoT #b 55 GRB #B 55 hydrogen helium 55 blue straggler 55 Martian meteorites 55 permanently shadowed craters 55 hydrated minerals 55 Bug Nebula 55 Galilean moons 55 helium atoms 55 extrasolar planet 55 CoRoT 7b 55 extrasolar planetary systems 55 spherical particles 55 celestial bodies 55 Enceladus 55 sparticles 55 Gondolo 55 diffraction pattern 55 VY Canis Majoris 55 gravitational lens 55 nebulosity 55 diffraction patterns 55 occultations 55 Lagoon Nebula 55 KH #D 55 vortices 55 HII regions 55 Mimas 55 Hawking radiation 55 solar corona 55 potentially habitable planets 55 cosmic rays 55 Helix nebula 55 Adam Riess 54 rotating neutron stars 54 galactic cosmic rays 54 spherical halo 54 tholins 54 J# +# [002] 54 star Beta Pictoris 54 XMM Newton observations 54 constellation Taurus 54 ultraluminous galaxy 54 XTE J# 54 supersolid 54 X ray emitting 54 GJ #b [002] 54 SNe Ia 54 Cosmologists 54 binary quasar 54 magma ocean 54 outer planets 54 R#a# 54 brightest supernova 54 constellation Leo 54 TNOs 54 tau neutrinos 54 Earths orbiting 54 exoplanetary systems 54 magnetic monopoles 54 Carina constellation 54 inhabitable planets 54 moonlet 54 Fermi telescope 54 infalling 54 filaments 54 morphologies 54 dirty snowballs 54 polaritons 54 elemental abundances 54 Cancri 54 Astrophysicists 54 Ring Nebula 54 silicate dust 54 faintest galaxies 54 Gliese #g 54 GeV 54 planet Uranus 54 PSR J# 54 Gamma rays 54 atomic nuclei 54 substorm 54 Astrophysics Cambridge Mass. 54 proto planetary disks 54 spectroscopic observations 54 Galilean satellites 54 supersymmetric 54 spatially resolved 54 optical spectra 54 heliosphere 54 muon neutrino 54 lavas 54 luminosity 54 particle acceleration 54 Gravitational lensing 54 substorms 54 Stephan Quintet 54 Comet Holmes 54 cosmic cannibal 54 velocity dispersion 54 gravitational interaction 54 RRATs 54 Maunder minimum 54 assumed planets circling 54 Rosette Nebula 54 Trojan asteroids 54 neutrino 53 dynamical processes 53 comets orbiting 53 magnetite crystals 53 auroral 53 carbonate globules 53 planets comets 53 galactic collisions 53 impactors 53 periodic oscillations 53 moons 53 dust enshrouded 53 Triangulum Galaxy 53 singularities 53 BLG #Lb 53 Dumbbell Nebula 53 MG J# +# 53 photometry 53 fermion 53 millimeter wavelengths 53 filamentary structures 53 inhomogeneous 53 circumstellar dust 53 VLTI 53 photons 53 moon Mab 53 Konacki 53 SN #D 53 magnetospheric 53 eclipsing binaries 53 Gliese #e 53 missing baryons 53 HD# [002] 53 Proxima Centauri 53 visible wavelengths 53 isotopic composition 53 fermions 53 Earth magnetosphere 53 galactic nuclei 53 exo planet 53 HAT P 53 Saturn magnetosphere 53 Saturnian moon 53 spectroscopic measurements 53 spheroidal 53 weak gravitational lensing 53 cosmic ray 53 axion 53 wavefunction 53 Veil Nebula 53 colloidal crystals 53 Supernova #A 53 RHESSI 53 ULP cepheids 53 exosolar planets 53 PSR B# +# 53 Einstein equations 53 electroweak 53 YORP effect 53 gamma ray emitting 53 zodiacal dust 53 sterile neutrino 53 spicules 53 Pleiades cluster 53 Earthlike 53 hypernova 53 nucleobases 53 hydrogen atoms 53 RX J# 53 Doradus 53 supernovae explosions 53 helium nuclei 53 kaons 53 OGLE TR #b 53 moon Io 53 CoRoT satellite 53 ROSAT 53 Orionids 52 corona 52 antiprotons 52 Hubble Constant 52 WMAP satellite 52 Mpc 52 antineutrinos 52 constellation Aquarius 52 relativistic protons 52 neutrinos 52 Earthlike planet 52 antiferromagnets 52 subatomic particles 52 Venusian atmosphere 52 hadron 52 constellation Coma Berenices 52 Gal Yam 52 meteoroids 52 Hipparcos 52 electron positron 52 heavily cratered 52 gamma ray bursts GRBs 52 X ray observatory 52 faraway galaxies 52 constellation Auriga 52 chondritic meteorites 52 extrasolar planets orbiting 52 weakly interacting 52 planets astronomers 52 olivine 52 CLG J# # 52 galaxy NGC# 52 fainter 52 primitive meteorites 52 SMM J# 52 maser emission 52 IRAS #-# 52 particle colliders 52 muon neutrinos 52 cosmological parameters 52 organic molecules 52 earthshine 52 general relativity 52 star Proxima Centauri 52 SEGUE 52 nucleon 52 star Fomalhaut 52 occulted 52 noble gases 52 B mesons 52 celestial object 52 superfluids 52 Saturn outermost ring 52 oxygen isotopes 52 celestial objects 52 distant supernovas 52 Andromeda halo 52 radial velocity method 52 galactic 52 polar vortex 52 cosmic ray protons 52 X ray spectra 52 Harvard Smithsonian 52 numerical simulations 52 sterile neutrinos 52 interstellar dust grains 52 neutrons 52 Orion constellation 52 earthlike planets 52 gravitationally lensed 52 moon Ganymede 52 SCP #F# 52 icy comets 52 Mandushev 52 Kailash Sahu 52 exciton 52 gravitational perturbations 52 interferometry 52 energetic cosmic rays 52 muons 52 proto planetary disk 52 collisional 52 Jupiter moon Io 52 Voorwerp 52 constellation Carina 52 relativistic jets 52 RY Sagittarii 52 cryovolcanism 52 gravitational redshift 52 transiting exoplanet 52 thermonuclear reactions 52 excitons 52 HIRES spectrometer 52 carbonate minerals 52 Cygnus X 52 moons Phobos 52 orbiting Chandra 52 chlorophyll molecules 52 Delta Cephei 52 nanomagnets 52 unaided eye 52 ultracold atoms 52 XO 3b 52 nanoantennas 52 Sagittarius B2 52 retrograde orbits 51 Saturnian moons 51 comet 51 strange quark 51 magnetosphere 51 suns 51 Pluto Charon 51 Bose Einstein condensation 51 Gaensler 51 astronomical phenomena 51 Butterfly Nebula 51 starbursts 51 filamentary 51 spherules 51 #gy 51 energetic gamma rays 51 lunar meteorites 51 chromosphere 51 hadrons 51 Trapezium 51 Dauphas 51 CMB radiation 51 Einstein cosmological constant 51 VHE gamma rays 51 cosmic microwave radiation 51 neutralino 51 OGLE 51 infrared spectra 51 superheavy elements 51 asterism 51 nebulas 51 neutrino mass 51 dense neutron stars 51 constellation Cygnus 51 Saturn moons 51 ALH# 51 moon Charon 51 COROT 51 smallest exoplanet 51 Sedna 51 transiting exoplanets 51 periodicities 51 planetary 51 Keck telescope 51 dusty disks 51 asteroids comets 51 quantum mechanical 51 IRAS 4B 51 gamma ray flares 51 DEEP2 51 TGFs 51 protoplanetary disc 51 energetic electrons 51 supernova remnant Cassiopeia 51 gamma ray photons 51 Upsilon Andromedae b 51 asteroid belt 51 astronomical observations 51 planets atmospheres 51 sunspot 51 IRC +# 51 Perseus Cluster 51 mantle plumes 51 quasiparticles 51 subatomic particle 51 galactic alignment 51 spectral fingerprints 51 planets asteroids 51 coronal mass ejections 51 Active Galactic Nuclei 51 gravitational attraction 51 strange quarks 51 constellation Scorpius 51 undiscovered particle 51 galaxy redshift 51 van Dokkum 51 nebula NGC 51 PZ Tel 51 quantum particle 51 Solar System 51 Triangulum 51 massless particles 51 isotopic ratios 51 particle detectors 51 anisotropy 51 Filippenko 51 SDSS 51 silicates 51 Avi Loeb 51 tidally locked 51 hematite mineral 51 Alfven waves 51 electron density 51 coronagraph 51 supersymmetry 51 high redshift galaxies 51 interstellar grains 51 Cosmic Microwave Background 51 Galaxies 51 Kazantzidis 51 globular cluster M# 51 ESO PR 51 Agol 51 Astrophysical 51 cosmic 51 dinosaur extinction 51 Wolfgang Brandner 51 Tarantula nebula 51 wavelengths 51 Wilkinson Microwave Anisotropy Probe 50 gravitational tug 50 quantum mechanically 50 planetoids 50 carbon isotopes 50 eukaryote 50 Toutatis 50 Sagittarius dwarf galaxy 50 electron neutrino 50 Saturn auroras 50 COROT 7b 50 osmium 50 Pulsars 50 isotope ratios 50 Jupiter moons 50 chondritic 50 submillimeter wavelengths 50 gamma rays emitted 50 gravitons 50 subsurface ocean 50 lunar craters 50 femtosecond timescale 50 NASA Wilkinson Microwave 50 Comet Machholz 50 TW Hydrae 50 constellation Eridanus 50 Quadrantids 50 boson 50 sulfur isotope 50 atomic particles 50 BLG #L 50 celestial phenomena 50 Noctilucent clouds 50 constellation Cetus 50 superdense 50 GRB 50 prebiotic molecules 50 ringed planet 50 inhomogeneities 50 zodiac constellations 50 Mojzsis 50 B meson 50 interstellar molecules 50 basaltic rocks 50 sun corona 50 GRB# 50 celestial sphere 50 silicon monoxide 50 W bosons 50 Astrophysical Journal Letters 50 Orionid meteors 50 Cosmic rays 50 mesons 50 gamma ray 50 vortexes 50 Bose Einstein Condensate 50 quasicrystals 50 aerosol particles 50 cometary 50 WM Keck Observatory 50 jovian 50 Geminids 50 antihelium 4 50 asteroids orbiting 50 starquakes 50 Alex Filippenko 50 moon Enceladus 50 Quaoar 50 polarimetry 50 Trifid 50 Iapetus 50 Cosmic Microwave Background CMB 50 Circinus X 1 50 Fomalhaut 50 2MASS 50 runaway thermonuclear 50 solar minima 50 ion collisions 50 ab initio calculations 50 quanta 50 redshifted 50 Geminid meteors 50 gravitational tides 50 carbon cenospheres 50 isotopic compositions 50 planet Gliese #c 50 constellation Andromeda 50 placental mammals 50 electron spins 50 cosmological models 50 cosmic ray particles 50 multicellular animals 50 cosmic dust 50 Mushotzky 50 Planetary nebulae 50 Kuiper Belt Object 50 meteor impacts 50 magma chambers 50 Rydberg atom 50 Hale Bopp 50 Quadrantid meteor shower 50 tidal tails 50 planet transits 50 gravitational tugs 50 spiral galaxy M# 50 bosons 50 circularly polarized light 50 melanosomes 50 meteoritic material 50 constellation Pegasus 50 Saturn outermost 50 fluorescing 50 plagioclase 50 mu Arae 50 orbits Saturn 50 quarks 50 fractal patterns 50 Crab pulsar 50 stellar occultations 50 absorption spectra 50 UDFy # 50 inner moons 50 constellation Draco 50 binary asteroids 49 planets Uranus 49 Jenniskens 49 radial velocity technique 49 Jupiter Saturn Uranus 49 potentially habitable 49 cosmic strings 49 z = 49 superstrings 49 magnetospheres 49 Vikhlinin 49 van Arkel discovery 49 Keck Interferometer 49 antihydrogen 49 coronal loops 49 tungsten isotopes 49 fermionic 49 elemental composition 49 ultracold 49 prograde 49 SN Ia 49 magnetotail 49 emits X rays 49 Tycho supernova 49 photon energies 49 solitons 49 high temperature superconductivity 49 Mauna Kea Hawaii 49 branes 49 periodic dimming 49 constellation Aquila 49 rotational axis 49 Maxwell equations 49 rubidium atoms 49 constellation Perseus 49 giant gaseous planets 49 photons particles 49 astrometric 49 Syrtis Major 49 Earth asteroids 49 femtoseconds 49 Comet Hale Bopp 49 galactic cannibalism 49 deuterium 49 TrES 49 excitations 49 Jovian moons 49 Tycho supernova remnant 49 photon fluorescence 49 rotating neutron 49 stony meteorites 49 quantum particles 49 dimensional electron 49 Chandra X ray