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(Click for frequent words.) 79 galaxies 79 supermassive black hole 75 neutron star 73 galaxy clusters 73 quasars 72 neutron stars 72 supernovae 71 quasar 71 dwarf galaxies 70 dwarf galaxy 70 active galactic nuclei 69 globular clusters 69 distant galaxies 69 protostar 69 Milky Way galaxy 68 supernova explosions 68 GRBs 68 spiral galaxies 68 supernova explosion 68 Milky Way Galaxy 67 merging galaxies 67 accretion disk 67 supernovas 67 elliptical galaxies 67 galaxy 66 supermassive 66 Milky Way 66 interstellar clouds 66 protoplanetary disk 66 X ray emission 65 starburst galaxies 64 pulsars 64 Eta Carinae 64 stellar nurseries 64 brown dwarfs 63 galaxy cluster 63 elliptical galaxy 63 gravitationally 63 planets 63 AGNs 63 supernova remnants 63 supernova 63 planetary nebulae 63 pulsar 63 rocky planets 62 protostars 62 galaxy formation 62 gravitational waves 62 gravitationally bound 62 globulars 62 Type Ia supernovae 62 globular cluster 62 accretion disks 62 interstellar medium 62 terrestrial planets 61 nebula 61 gamma ray bursts 61 magnetar 61 magnetic fields 61 planetesimals 61 SN #A 61 galaxies collide 61 Neutron stars 61 colliding galaxies 61 red supergiant 61 nuclei 61 planetary nebula 61 nebulae 61 supermassive stars 60 SMBH 60 starburst galaxy 60 red supergiants 60 millisecond pulsars 60 Wolf Rayet star 60 accreting 60 protoplanetary disks 60 X ray binary 60 distant galaxy 60 gravitational interactions 60 galactic mergers 59 giant elliptical galaxies 59 blue supergiant 59 Supermassive black 59 brown dwarf 59 blazars 59 Gamma ray bursts 59 Andromeda galaxy 59 Earthlike planets 59 ULIRGs 59 SMBHs 59 sunlike stars 59 super Earths 58 atoms 58 WASP #b 58 comets 58 magnetars 58 solar nebula 58 gamma ray burst 58 Supernovae 58 gamma rays 58 Type Ia supernova 58 SN #gy 58 type Ia supernovae 58 circumstellar disks 58 exoplanets orbiting 58 supernova remnant 57 nucleosynthesis 57 hot Jupiters 57 astrophysical 57 Kuiper belt 57 exoplanets 57 galactic disk 57 atomic nuclei 57 quark gluon plasma 57 magnetic reconnection 57 gravitational radiation 57 positrons 57 Andromeda Galaxy 57 X ray binaries 57 planets orbits 57 relativistic particles 57 Gravitational waves 57 Large Magellanic Cloud 57 interstellar cloud 57 planet HD #b 57 RS Ophiuchi 57 luminous galaxies 57 supergiant star 57 millisecond pulsar 57 active galactic nucleus 57 BP Psc 56 protoplanets 56 infall 56 novae 56 HM Cancri 56 X ray Observatory 56 distant supernovae 56 Virgo Cluster 56 infalling 56 Type 1a supernovae 56 habitable planets 56 planets orbiting 56 globular star 56 Virgo cluster 56 neutrons 56 Enceladus 56 hypervelocity stars 56 spiral galaxy 56 supersymmetric particles 56 galactic nuclei 56 circumstellar 56 Milky Way halo 56 distant quasars 56 extrasolar planets 56 subatomic particles 56 interacting galaxies 56 cosmic rays 55 galaxy NGC 55 gamma ray emission 55 coronal mass ejections 55 Hot Jupiters 55 rotating neutron stars 55 moonlets 55 proplyds 55 planets moons 55 blue straggler 55 Saturn rings 55 type Ia supernova 55 ejecta 55 microquasar 55 Oort Cloud 55 Crab Nebula 55 superfluid 55 galactic cores 55 X ray emitting 55 circumstellar disk 55 proto galaxies 55 Cepheids 55 transiting planets 55 HD#b 55 GeV 55 Orion Nebula 55 X ray wavelengths 55 chondrules 55 neutralinos 55 thermonuclear reactions 55 Red Rectangle 55 gravitational interaction 55 vortices 55 reionization 55 sodium atoms 54 dense clumps 54 HD #b [002] 54 CMEs 54 galaxy M# [002] 54 SN#A 54 WIMPs 54 supernovae explosions 54 superdense 54 observable universe 54 protoplanet 54 constellation Cassiopeia 54 Coma Cluster 54 Bullet Cluster 54 giant elliptical galaxy 54 GRB # 54 nebular 54 extrasolar 54 hypernova 54 galactic 54 astronomers 54 galactic bulge 54 supergiant stars 54 habitable zones 54 redshift 54 elongated orbits 54 eccentric orbits 54 planemos 54 Magellanic Clouds 54 Beta Pictoris b 54 Hawking radiation 54 Earths orbiting 54 high temperature superconductivity 54 proton 54 icy moons 54 Antennae Galaxies 54 Omega Centauri 54 gaseous planet 54 Type Ia supernovas 54 KBOs 54 runaway thermonuclear 54 sunlike star 54 extragalactic 54 Seyfert galaxies 54 magnetosphere 53 galactic collisions 53 Carina Nebula 53 baryons 53 electrons 53 galactic clusters 53 organic molecules 53 Galaxies 53 XTE J# 53 Henize #-# 53 Earth magnetosphere 53 neutrinos 53 spacetime 53 planet orbiting 53 cosmic phenomena 53 helium atoms 53 afterglows 53 photosphere 53 Epsilon Eridani 53 moons orbiting 53 muons 53 Wolf Rayet stars 53 protons 53 comet 53 submillimeter galaxies 53 metallicity 53 planetary embryos 53 galactic halo 53 Fomalhaut b 53 Hubble observations 53 gravitational lensing 53 gamma ray 53 Zeta Ophiuchi 53 blazar 53 ionized gas 53 Geminga 53 galactic cosmic rays 53 orbiting planets 53 Solar System 53 antimatter particles 53 Higgs particle 53 Arches Cluster 53 fainter objects 53 astrophysicists 52 electron neutrinos 52 interstellar dust 52 Saturn moons 52 antiprotons 52 XMM Newton 52 energetic electrons 52 relativistic jets 52 radial velocity 52 Oort cloud 52 planets orbiting stars 52 planet WASP #b 52 HL Tau 52 exoplanet 52 spinning neutron 52 Trojan asteroids 52 Upsilon Andromedae 52 Active Galactic Nuclei 52 infalling gas 52 GRB 52 Gamma rays 52 filaments 52 PSR J# 52 astronomical objects 52 elliptical galaxy NGC 52 comet nucleus 52 CoRoT 7b 52 gravitational 52 gravitational microlensing 52 Supernova #A 52 Bug Nebula 52 Kuiper belt objects 52 fermions 52 particles 52 hydrogen atoms 52 Kuiper Belt objects 52 comets orbiting 52 superdense neutron star 52 Evolution Explorer 52 Saturn magnetosphere 52 neighboring Andromeda galaxy 52 Cygnus X 52 exoplanet orbiting 52 cosmic ray particles 52 Beta Pictoris 52 filamentary structure 52 Higgs bosons 52 proto planetary disk 52 TrES 4 52 AB Aurigae 52 orbits 52 Astrophysicists 52 eclipsing binary 51 PSR J# +# 51 solar corona 51 planet orbits 51 Tarantula Nebula 51 Small Magellanic Cloud 51 Type Ia 51 interstellar dust clouds 51 particle acceleration 51 exo planets 51 W boson 51 Fornax cluster 51 suns 51 GQ Lupi 51 GJ #b [002] 51 chemical abundances 51 proto planetary disks 51 intrinsic brightness 51 oppositely directed 51 cosmological distances 51 constellation Sagittarius 51 V# Mon 51 HII regions 51 Bok globules 51 solar flares 51 planets circling 51 Venusian atmosphere 51 hydrogen nuclei 51 magma ocean 51 protoplanetary 51 Alfven waves 51 asteroid belt 51 X ray telescopes 51 masers 51 infalling matter 51 Wolszczan 51 star Gliese 51 proton collisions 51 corona 51 Orion nebula 51 asteroids 51 outer planets 51 antiparticles 51 vortexes 51 spinning neutron stars 51 Alfvén waves 51 excitons 51 Bose Einstein condensates 51 neutrino 51 R#a# 51 mitochondria 51 protoplanetary discs 51 magnetic monopoles 51 highly magnetized neutron 51 starbursts 51 baryonic 51 substorm 51 sterile neutrino 51 Astronomers 51 Globular clusters 51 dynamical 51 gaseous planets 50 ion collisions 50 circular orbits 50 antimatter 50 Bose Einstein condensate 50 constellation Virgo 50 Kuiper Belt Objects 50 gravitational wave 50 lensing galaxy 50 axion 50 NASA Chandra 50 dense neutron stars 50 constellation Ursa Major 50 dwarf spheroidal galaxies 50 fainter 50 extrasolar planetary systems 50 CoRoT 9b 50 general relativity 50 Elliptical galaxies 50 gravitational lenses 50 TGFs 50 sterile neutrinos 50 Kuiper Belt 50 Hanny Voorwerp 50 Magnetars 50 electroweak 50 nucleon 50 astrophysical objects 50 planetesimal 50 redshifts 50 carbonate minerals 50 emit X rays 50 cosmologists 50 cosmic microwave background 50 Crab Pulsar 50 photons 50 rotating neutron 50 Astrophysical Journal 50 hadrons 50 Gliese #c 50 Komossa 50 mantle plumes 50 GJ#b 50 GRB# 50 collisional 50 constellation Hercules 50 planets orbiting distant 50 thermonuclear explosion 50 Kazantzidis 50 RHIC 50 torus 50 CAIs 50 substorms 50 cosmic ray 50 SUSY 50 nucleobases 50 gravitational attraction 50 impactors 50 Earths 49 Pulsars 49 exoplanetary 49 GRB #B 49 dirty snowballs 49 inhabitable planets 49 VY Canis Majoris 49 radioactive decay 49 chemical reactions 49 coronal mass ejections CMEs 49 permanently shadowed craters 49 proton proton collisions 49 constellation Carina 49 dynamical evolution 49 retrograde orbit 49 X ray pulses 49 helium nuclei 49 maser emission 49 Cancri e 49 quarks 49 cosmic 49 binary asteroid 49 phonons 49 magnetospheric 49 deuterium atoms 49 habitable planet 49 AU Mic 49 X ray observatories 49 kaons 49 molten magma 49 antiparticle 49 subatomic 49 particle colliders 49 Rydberg atoms 49 Fermi telescope 49 celestial object 49 ionized hydrogen 49 muon neutrinos 49 spicules 49 planets comets 49 moon Ganymede 49 heliosphere 49 galaxy supermassive black 49 planet magnetosphere 49 Planetary nebulae 49 NGC# 49 planetary 49 gravitational tides 49 Gliese #e 49 crystalline silicates 49 GJ #b [001] 49 Saturn auroras 49 astrophysical phenomena 49 cosmic particles 49 emits X rays 49 RX J# 49 ultraviolet wavelengths 49 strangelet 49 J# +# [002] 49 extrasolar planets orbiting 49 supersolid 49 Harvard Smithsonian 49 Eagle Nebula 49 galaxy NGC# 49 energetic gamma rays 49 subatomic particle 49 Corot 7b 49 strangelets 49 axions 49 outer layers 49 proton antiproton collisions 49 cluster NGC 49 RS Oph 49 polaritons 49 moonlet 49 coronal mass ejection 49 particle accelerators 49 auroras 49 HAT P 48 high redshift galaxies 48 gamma ray flares 48 brightest supernova 48 planets orbiting sun 48 SN #C 48 planetary orbits 48 faint galaxies 48 silicate dust 48 filamentary structures 48 noctilucent clouds 48 Spitzer Space Telescope 48 colliders 48 emission nebula 48 icy comets 48 gamma ray bursts GRBs 48 Astrophysical 48 Trifid 48 spherically symmetric 48 CoRoT #b 48 atomic particles 48 Perseus Cluster 48 magnetic flux 48 supergiants 48 Proxima Centauri 48 alpha particles 48 asteroids comets 48 SMM J# 48 auroral 48 moons 48 foreground galaxy 48 transiting planet 48 Filippenko 48 Saturn moon Enceladus 48 gravitational pulls 48 Io Europa 48 gaseous 48 hydrogen helium 48 Earthlike planet 48 Corot 9b 48 Pluto Charon 48 ESA XMM Newton 48 Supernovas 48 lithium atoms 48 mesons 48 atomic nucleus 48 Carina constellation 48 cosmological theories 48 LHC experiments 48 SDSS II 48 Cosmic rays 48 chromosphere 48 dusty disks 48 numerical simulations 48 Type 1a supernova 48 Trifid Nebula 48 angular momentum 48 antihydrogen 48 comets asteroids 48 tholins 48 Microlensing 48 TrES 48 deuterium 48 galaxy M# [001] 48 BP Piscium 48 aurorae 48 Cat Paw Nebula 48 faraway galaxies 48 Kuiper belt object 48 Voorwerp 48 spinning pulsar 48 bosonic 48 particles emitted 48 Lagoon Nebula 48 Betelgeuse 48 extrasolar planetary 48 superfluids 48 Saturnian moon 48 cosmic ray collisions 48 exoplanetary systems 48 Gravitational lensing 48 baryon 48 Einstein theory 48 muon neutrino 48 Smithsonian astronomer 48 Cosmologists 48 spiral galaxy NGC 48 reflection nebula 48 neutrino particles 48 distant quasar 48 energetic cosmic rays 48 antineutrinos 48 helium ions 48 gravitational tug 48 spiral nebulae 48 Triangulum 48 transiting exoplanet 48 superclusters 48 binary asteroids 47 Galilean moons 47 pions 47 Big Bang 47 ions 47 exo planet 47 PSR B# +# 47 baryonic matter 47 Kuiper Belt object 47 Astrophysical Journal Letters 47 gravitons 47 cosmic cannibal 47 proto cluster 47 osmium 47 distant galaxy clusters 47 infrared wavelengths 47 highly elliptical orbits 47 W bosons 47 SN #D 47 habitable worlds 47 orbiting 47 Comet Tempel Tuttle 47 V# Sgr 47 Black Holes 47 earthlike planets 47 Gliese #d 47 HD# [002] 47 jovian 47 ionized particles 47 Cancri 47 sized planets orbiting 47 electron volts 47 potentially habitable planets 47 P/# A2 47 oxygen atoms 47 Neil Gehrels 47 fermion 47 weakly interacting 47 tidal tails 47 lunar crust 47 branes 47 undiscovered particle 47 Galactic cosmic rays 47 electron beams 47 silicates 47 Jupiter moon Io 47 interstellar space 47 Jupiter Saturn Uranus 47 asteroidal 47 earths 47 optical telescopes 47 VHE gamma rays 47 Astrophysics Cambridge Mass. 47 SNe 47 Kepler #b 47 shorter wavelengths 47 Adam Riess 47 galactic cannibalism 47 subsurface ocean 47 interstellar molecules 47 ultracold 47 asteroids orbiting 47 Galaxy Evolution 47 olivine 47 supercontinents 47 universe 47 WM Keck Observatory 47 interstellar dust grains 47 Helix Nebula 47 nanocrystals 47 spherical halo 47 radial velocity technique 47 electron 47 extrasolar planet 47 Fermilab Tevatron 47 gravitational lens 47 superluminal 47 exosolar planets 47 ringed planet 47 muon 47 moon Enceladus 47 Pieter van Dokkum 47 strange quarks 47 CMB photons 47 cosmological 47 abundances 47 redshifted 47 luminosities 47 exosphere 47 G#.# +#.# 47 SN #E 47 gamma rays emitted 47 nucleons 47 Saturnian system 47 Martian meteorites 47 Mandushev 47 Gal Yam 47 Alex Filippenko 46 comet orbit 46 antihelium 4 46 Solar flares 46 dimers 46 YORP effect 46 spheroidal 46 ionised 46 Doradus 46 magma 46 particle detectors 46 cosmic strings 46 quantum tunneling 46 relativistic protons 46 Computer simulations 46 retrograde orbits 46 particle beams 46 celestial objects 46 electron positron pairs 46 buckyballs 46 occultations 46 undersea volcanoes 46 Earth asteroids 46 interstellar particles 46 microlensing 46 microlensing events 46 supersymmetry 46 ionize 46 moon Mimas 46 stellar seismology 46 mesosphere 46 gravitational tugs 46 ultraluminous galaxy 46 nucleation 46 gamma ray emitting 46 Andromeda 46 multicellular animals 46 protons collide 46 periodic dimming 46 cosmos 46 magmas 46 dust enshrouded 46 clathrates 46 MG J# +# 46 gamma ray observatory 46 singularities 46 gravitational pull 46 ULP cepheids 46 meteoroid impacts 46 nanobubbles 46 Earthlike 46 Keck Interferometer 46 missing baryons 46 sunspots 46 Epsilon Aurigae 46 spherules 46 quark 46 rubidium atoms 46 constellation Centaurus 46 solitons 46 protoplanetary disc 46 constellation Eridanus 46 CoRoT 46 B mesons 46 Saturn aurora 46 SNe Ia 46 boson 46 filamentary 46 star Beta Pictoris 46 COROT 46 TW Hydrae 46 distant supernovas 46 colliding protons 46 thermonuclear fusion 46 Lyman alpha 46 tau neutrinos 46 gluons 46 moon Io 46 Coma cluster 46 airbursts 46 hematite mineral 46 Comet Holmes 46 planet Gliese #c 46 magma chambers 46 star Proxima Centauri 46 meteorite impacts 46 Chi Cygni 46 #gy 46 Andromeda halo 46 RXTE 46 Extraterrestrial Physics 46 antiquarks 46 supernovae explode 46 electrons protons 46 cometary material 46 HIP #b 46 VLTI 45 rotational axis 45 Richard Mushotzky 45 silicon monoxide 45 barred spiral galaxy 45 Cepheid variables 45 meteoroids 45 Jovian moon 45 spectroscopic 45 planetoids 45 XMM Newton observations 45 spatial dimensions 45 BECs 45 olivine mineral 45 faintest galaxies 45 exciton 45 constellation Draco 45 Yellowstone supervolcano 45 polar vortex 45 dusty cocoons 45 inner asteroid belt 45 strange quark 45 primitive meteorites 45 superstrings 45 Pegasi 45 gravity warps 45 Stephan Quintet 45 Einstein relativity theory 45 planetary nebulas 45 Super Earths 45 photosynthesis 45 spatially resolved 45 VB #b 45 Extrasolar planets 45 nanodiamonds 45 chondrites 45 supersymmetric 45 hydrothermal 45 Veil Nebula 45 water vapor 45 microscopic organisms 45 Cosmic Microwave Background 45 Jovian moons 45 meteor impacts 45 blackholes 45 cesium atoms 45 superheavy elements 45 Crab pulsar 45 ultracold atoms 45 neutrino mass 45 Distant galaxies 45 radial velocity method 45 molten rock 45 infrared photons 45 Saturn moon 45 potassium atoms 45 carbonaceous chondrites 45 binary quasar 45 molecules 45 fading afterglow 45 comet dust 45 X ray observatory 45 habitable zone 45 Earth crust 45 non baryonic 45 Hale Bopp 45 meteoritic material 45 particle collisions 45 brightnesses 45 supercontinent 45 Exoplanets 45 photons particles 45 photons emitted 45 intracluster 45 Cepheid variable 45 Sagittarius B2 45 neutralino 45 single celled organisms 45 Kepler 9c 45 quantum mechanical 45 RRATs 45 cosmological parameters 45 constellation Leo 45 Sagittarius dwarf galaxy 45 constellation Cygnus 45 terahertz radiation 45 cometary 45 constellation Taurus 45 Gamma ray burst 45 spectroscopically 45 planets Uranus 45 coccolithophores 45 Orion constellation 45 particles WIMPs 45 elliptical orbits 45 Upsilon Andromedae b 45 cosmological models 45 SN Ia 45 astrocytes 45 Cosmic Evolution 45 positron 45 theoretical particle 45 coronagraph 45 WHIM 45 prebiotic molecules 45 Iapetus 45 Gaensler 45 moons orbiting Pluto 45 abiogenesis 45 novas 45 Spiral galaxies 45 hypervelocity star 45 quanta 45 Gliese 45 planet Uranus 45 Triangulum Galaxy 45 potentially habitable 45 tiniest particles 45 OGLE TR #b 45 solar neutrinos 44 transiting exoplanets 44 carbonate globules 44 RHESSI 44 velocities 44 stellar occultations 44 innermost planet 44 Bose Einstein condensation 44 KH #D 44 R Coronae Borealis 44 astrometry 44 magnetotail 44 multicellular organisms 44 BLG #Lb 44 CMB radiation 44 Rosette Nebula 44 diffuse aurora 44 photon 44 phytochrome 44 planets astronomers 44 Higgs boson particle 44 Haumea 44 Bose Einstein Condensate 44 mu Arae 44 Cosmic Microwave Background CMB 44 tidally 44 electrons orbiting 44 Comet Hale Bopp 44 superfluidity 44 Tycho supernova remnant 44 lunar perigee 44 silicate mantle 44 volcanism 44 single celled algae 44 oscillations 44 zodiacal dust 44 Trapezium 44 Chandra X ray 44 positronium 44 lavas 44 electron neutrino 44 GALEX 44 RMC #a 44 gaseous envelope 44 nebulas 44 NGC #A 44 Particle acceleration 44 inner moons 44 spectroscopic observations 44 Cassini Huygens 44 constellation Aquarius 44 quantum mechanically 44 geoneutrinos 44 galaxy Andromeda 44 NASA Fermi Gamma 44 Cassini ion 44 z ~ 44 wavefunction 44 eclipsing binaries 44 mitochondrion 44 convective 44 nebula NGC 44 Leonids