Related by context. Frequent words. (Click for all words.) 60 spiral galaxy 59 Large Magellanic Cloud 58 galaxy cluster 57 supernova remnant 56 Milky Way Galaxy 56 Andromeda galaxy 56 Andromeda Galaxy 56 Orion Nebula 56 Betelgeuse 55 constellation Leo 55 distant galaxy 54 nebula 53 Cancri 53 HD #b [002] 53 planetary nebula 53 planet orbits 53 redshift 52 Fomalhaut 52 ecliptic 52 orbits 52 Crab Nebula 52 globular cluster 52 GeV 52 constellation Perseus 51 Milky Way galaxy 51 quasar 51 dwarf galaxy 51 constellation Orion 50 XMM Newton 50 infrared wavelengths 50 ionized gas 50 supernova explosion 50 GRB # 49 Deneb 49 observable universe 49 Milky Way 49 planets orbiting 49 galaxy 49 Arcturus 49 visible wavelengths 49 X ray emission 49 perigee 49 distant galaxies 49 Cassiopeia 48 torus 48 quasars 48 Kuiper belt 48 spiral galaxies 48 Gliese 48 Mimas 48 globular clusters 48 kilometers 48 circular orbit 48 planet orbiting 48 VLBA 48 elliptical galaxies 48 astronomical objects 48 celestial object 48 supercluster 48 km 48 femtoseconds 48 constellation 47 Eta Carinae 47 Very Large Telescope 47 unaided eye 47 Pleiades 47 Sedna 47 anisotropy 47 microlensing 47 z = 47 magnetar 47 nebulae 47 Kilometers 47 auroral 47 GPa 47 interferometer 47 equatorial 46 elliptical orbit 46 OGLE 46 galaxies 46 galaxy clusters 46 optical telescopes 46 orbiting 46 GRBs 46 pulsar 46 gamma ray burst 46 equator 46 electron volts 46 corona 46 west longitude 46 geosynchronous orbit 46 COROT 46 ° 45 WM Keck Observatory 45 asteroid belt 45 solar nebula 45 extrasolar planets 45 supernova remnants 45 accretion disk 45 satellites orbiting 45 comet nucleus