Related by context. Frequent words. (Click for all words.) 67 globular cluster 64 supernova remnant 63 spiral galaxy 61 Orion Nebula 61 magnetar 60 spiral galaxies 60 nebula 60 dwarf galaxy 60 galaxy cluster 59 HD #b [002] 59 X ray emission 58 Andromeda Galaxy 58 Crab Nebula 58 globular clusters 57 distant galaxy 57 elliptical galaxies 57 quasar 57 Eta Carinae 56 Milky Way Galaxy 56 Andromeda galaxy 56 quasars 56 GRBs 55 galaxy clusters 55 pulsars 55 constellation Leo 54 XMM Newton 54 ecliptic 54 Milky Way 54 Betelgeuse 54 brown dwarf 54 brown dwarfs 54 auroral 54 supernova explosion 54 accretion disk 54 nebulae 54 dwarf galaxies 53 galaxies 53 Saturn rings 53 Gliese #g 53 interferometry 53 planet orbiting 53 Kuiper belt 53 supermassive black hole 53 hot Jupiters 52 torus 52 supernovae 52 pulsar 52 Milky Way galaxy 52 Sedna 52 gravitational lensing 52 ionized gas 52 supernovas 51 ellipse 51 ejecta 51 Mimas 51 astronomers 51 X ray Observatory 51 Large Magellanic Cloud 51 gamma ray bursts 51 supernova 51 neutron stars 51 gamma ray burst 51 distant galaxies 51 neutron star 51 extrasolar planet 51 redshift 51 spectra 50 galaxy 50 supernova explosions 50 extrasolar planets 50 infrared wavelengths 50 GeV 50 galaxy formation 50 optical telescopes 50 Deneb 50 gravitationally 50 exoplanet 49 Very Large Array 49 planets orbiting 49 Cassiopeia 49 astronomical objects 49 terrestrial planets 49 exoplanets 49 gravitational wave 49 sunspot 49 Arcturus 49 magnetic flux 49 supermassive black holes 49 constellation Perseus 49 celestial object 49 Iapetus 49 tiger stripes 48 J# [002] 48 orbits 48 WIMPs 48 muon 48 Pleiades 48 filaments 48 Nebula 48 starburst 48 vortices