Related by context. Frequent words. (Click for all words.) 57 planetary nebula 55 Crab Nebula 54 Orion Nebula 54 planet orbiting 54 supernova remnant 54 Cancri 54 GRB # 54 constellation Leo 54 constellation Perseus 54 magnetar 54 Cassiopeia 54 Fomalhaut 54 Betelgeuse 53 nebula 53 Large Magellanic Cloud 53 HD #b [002] 52 Mimas 52 planet orbits 52 Eta Carinae 51 Galaxy Evolution 51 globular cluster 51 auroral 51 brown dwarf 51 COROT 51 quasar 51 ejecta 50 visible wavelengths 50 ecliptic 50 celestial object 50 spiral galaxy 50 X ray emission 50 galaxy cluster 50 dwarf galaxy 50 supernova explosion 50 redshift 50 Arcturus 50 Pleiades 49 Andromeda Galaxy 49 Milky Way Galaxy 49 ionized gas 49 orbits 49 NICMOS 49 infrared wavelengths 49 supernova 49 globular clusters 48 Deneb 48 distant galaxy 48 Scorpius 48 spiral galaxies 48 constellation 48 anisotropy 48 accretion disk 48 Sedna 48 Suzaku 48 supernova remnants 48 XMM Newton 48 planets orbiting 48 superfluid 48 gamma ray burst 48 Andromeda galaxy 48 terrestrial planets 47 constellation Orion 47 coronal 47 supernovae 47 α 47 Iapetus 47 Gliese 47 extrasolar planet 47 quasars 47 OGLE 46 perigee 46 ionosphere 46 GeV 46 unaided eye 46 fainter 46 exoplanets 46 elliptical galaxies 46 Spitzer Space Telescope 46 distant galaxies 46 luminosity 46 ionospheric 46 nova 46 equatorial 45 brown dwarfs 45 ellipse 45 GRBs 45 Saturn rings 45 circular orbit 45 irradiance 45 microlensing 45 nebulae 45 coronal mass ejection 45 X ray Observatory 45 Earth magnetosphere 45 occultation 45 aurora 45 ringed planet 44 Omicron 44 Supplementary Fig 44 Kuiper belt 44 Alpha Centauri