Related by context. Frequent words. (Click for all words.) 68 constellation Leo 67 constellation Orion 65 constellation Perseus 63 Betelgeuse 62 planet orbits 62 Fomalhaut 61 unaided eye 61 Orion Nebula 60 star Gliese 60 planetary nebula 60 HD #b [002] 59 Andromeda galaxy 59 constellation 58 Andromeda Galaxy 58 supernova remnant 57 Pleiades 57 Scorpius 57 Cancri 57 globular cluster 57 Milky Way Galaxy 56 Deneb 56 ringed planet 56 nebula 56 Aldebaran 56 Kuiper belt 55 planet orbiting 55 Arcturus 55 Large Magellanic Cloud 55 spiral galaxy 55 dwarf galaxy 55 distant galaxy 55 planetary nebulae 55 Crab Nebula 55 Cassiopeia 54 Eta Carinae 54 ecliptic 54 celestial object 54 nebulae 54 galaxy cluster 54 constellations 54 X ray emission 54 occultation 53 Ursa Major 53 Comet McNaught 53 redshift 53 ESO Very Large Telescope 53 Algol 53 supergiant 53 globular clusters 52 extrasolar planet 52 elliptical galaxies 52 infrared wavelengths 52 Procyon 52 Spica 52 comet nucleus 52 Leonids 52 Jupiter Saturn 51 brown dwarf 51 perigee 51 ionized gas 51 Galaxy Evolution 51 heliosheath 51 Mimas 51 spiral galaxies 51 galaxy 51 fainter 51 aurora 51 Milky Way galaxy 51 meteor shower 50 ejecta 50 planets circling 50 Milky Way 50 solar corona 50 Geminids 50 Gamma ray bursts 50 magnetar 50 moon Charon 50 GRB # 50 interstellar dust 50 Jupiter moons 50 orbits 49 Sedna 49 moonless night 49 planets orbiting 49 comet 49 gamma ray burst 49 Ophiuchus 49 haloes 49 GRBs 49 Saturn moon Enceladus 49 Leonid meteor shower 49 brown dwarfs 49 Spitzer Space Telescope 49 XMM Newton 49 umbra 49 Lutetia 49 Halley comet 48 Aurora Borealis 48 quasars 48 observable universe 48 visible wavelengths