Related by context. Frequent words. (Click for all words.) 52 Arcturus 51 Scorpius 51 Cassiopeia 51 Pleiades 51 XMM Newton 50 Sedna 49 ecliptic 49 Deneb 49 COROT 48 Leonids 48 Andromeda 48 occultation 48 celestial objects 47 Andromeda Galaxy 47 constellations 47 redshift 47 magnetar 46 nebulae 46 Orion Nebula 46 aurora 46 Spica 46 Ophiuchus 46 distant galaxy 46 Perseids 45 Eta Carinae 45 equinoxes 45 Geminids 45 circular orbit 45 X ray emission 45 Betelgeuse 45 orbits 44 dwarf galaxy 44 HD #b [002] 44 Procyon 44 nebula 44 planet orbiting 44 ESO Very Large Telescope 44 Johannes Kepler 43 Uranus 43 galaxy cluster 43 Milky Way Galaxy 43 Alpha Centauri 43 ringed planet 43 extrasolar planet 43 unaided eye 43 planets 43 supermoon 43 perigee 43 GRBs 43 exoplanet 43 meteor shower 43 gamma ray burst 43 constellation 42 binary 42 UB# [003] 42 Chronos 42 interferometry 42 supernovae 42 Aldebaran 42 Jupiter moons 42 Charon 42 Ganymede 42 supernova 42 extrasolar planets 42 maxima 41 Phobos 41 autumnal equinox 41 Altair 41 galaxy 41 equinox 41 moons 41 Iapetus 41 supernova explosion 41 astronomers 41 Planck 41 sunspot 41 Lutetia 41 suns 41 Virgo 41 Draco 41 quasar 40 elliptical galaxies 40 substorms 40 brown dwarf 40 starlight 40 GOCE 40 Milky Way 40 supernova remnant 40 celestial bodies 40 umbra 40 Deimos 40 astronomical objects 40 Pluto 40 dynamical 40 meteor showers 40 gamma ray bursts 40 Ursa Major 40 anisotropy 40 globular clusters 39 SDSS 39 super Earths