Related by context. Frequent words. (Click for all words.) 58 supernova remnant 57 globular cluster 57 brown dwarf 56 Andromeda Galaxy 56 Orion Nebula 56 Eta Carinae 55 globular clusters 54 Milky Way Galaxy 54 redshift 53 planet orbiting 53 Cassiopeia 53 Gliese 53 Betelgeuse 53 nebula 52 galaxy cluster 52 Large Magellanic Cloud 52 brown dwarfs 52 X ray emission 51 GeV 51 dwarf galaxy 51 XMM Newton 51 Andromeda galaxy 51 magnetar 50 Milky Way 50 quasars 50 supernova explosion 50 spiral galaxy 50 constellation Leo 50 HD #b [002] 50 Arcturus 50 nebulae 49 Pleiades 49 spectroscopic 49 supernova 49 galaxies 48 quasar 48 Nd 48 elliptical galaxies 48 distant galaxy 48 gamma ray burst 48 nova 48 unaided eye 48 spectra 47 supernovae 47 orbits 47 muon 47 spiral galaxies 47 infrared wavelengths 47 photometric 47 GRBs 47 extrasolar planet 47 Fig 47 anisotropy 47 Orbiting 46 Spica 46 distant galaxies 46 Andromeda 46 Galaxies 46 ionized gas 46 pulsar 46 auroral 46 astronomical objects 46 celestial object 46 Deneb 46 FRET 46 Nebula 46 ejecta 46 perigee 45 Sedna 45 ESO Very Large Telescope 45 habitable planets 45 galaxy 45 COROT 45 Sunspot 45 interferometry 45 planets orbiting 45 dwarf galaxies 45 ecliptic 45 Io 45 extrasolar planets 45 pulsars 45 neutron star 45 fainter 45 luminosity 45 gravitational wave 45 NGC 44 corona 44 ref. 44 Solar System 44 rocky planets 44 exoplanet 44 galaxy clusters 44 supernova explosions 44 supermassive black hole 44 abundances 44 Hinode 44 super Earths 44 ellipse 44 Supplementary Fig 44 Saturn rings 44 constellation