Related by context. Frequent words. (Click for all words.) 72 constellation Leo 71 constellation Orion 66 constellation Perseus 62 Arcturus 61 Fomalhaut 59 Crab Nebula 59 Betelgeuse 57 Andromeda Galaxy 57 Scorpius 57 ecliptic 56 celestial object 56 GRB # 55 Eta Carinae 55 Andromeda galaxy 55 star Gliese 55 Deneb 55 Orion Nebula 55 Spica 54 gamma ray burst 54 Oort Cloud 54 supernova remnant 54 Milky Way Galaxy 54 globular cluster 54 Pleiades 53 unaided eye 53 Cassiopeia 53 dwarf galaxy 53 distant galaxy 53 Bootes 53 La Silla Chile 53 X ray emission 53 planet orbiting 53 planetary nebula 53 nebula 53 occultation 52 Comet McNaught 52 radial velocity 52 Cancri 51 planet orbits 51 Gamma ray bursts 51 ionized gas 51 Ophiuchus 51 Mauna Kea Hawaii 51 auroral 51 planetary nebulae 51 supermoon 51 aurora 51 Geminids 50 magnetar 50 extrasolar planet 50 constellation 50 Large Magellanic Cloud 50 aurorae 50 Perseid meteor shower 50 Phaethon 50 HD #b [002] 50 infrared wavelengths 50 Algol 50 quasar 50 innermost planet 50 active galactic nuclei 50 galaxy cluster 50 reddish color 50 XMM Newton 50 Sedna 50 Galaxy Evolution 50 Leonid meteor shower 49 magnetars 49 crescent moon 49 Kuiper belt 49 Palomar Observatory 49 Cabeus 49 autumnal equinox 49 constellations 49 comet 49 moonless 49 COROT 49 orb 49 Procyon 49 solar corona 48 Perseids 48 redshift 48 Aldebaran 48 spiral galaxy 48 brown dwarf 48 fainter 48 photometry 48 meteor shower 48 rock outcrop 48 moonrise 48 sunspot 48 Martian equator 48 Leonids 48 supernova explosion 48 astronomical objects 48 microlensing 48 GRBs 48 Halley comet 48 photometer 47 accretion disk 47 Saturn moon Enceladus