Related by context. Frequent words. (Click for all words.) 57 Crab Nebula 56 HD #b [002] 55 Cassiopeia 55 Cancri 54 constellation Leo 54 Deneb 53 Andromeda Galaxy 52 planet orbiting 51 constellation Orion 51 constellation Perseus 51 Betelgeuse 50 extrasolar planet 50 Alpha Centauri 50 celestial object 50 unaided eye 50 Orion Nebula 50 Sedna 50 planetary nebula 50 planet orbits 49 Gliese #g 49 Jupiter Saturn 49 COROT 48 Arcturus 48 exoplanets 48 Pleiades 48 nebulae 48 planets orbiting 48 constellations 47 galaxy cluster 47 supernova remnant 47 Fomalhaut 47 Aldebaran 47 XMM Newton 47 exoplanet 47 Bootes 46 moon Charon 46 magnetar 46 Little Dipper 46 GRBs 46 nebula 46 redshift 46 Mimas 46 planets 46 perigee 46 Spica 46 extrasolar planets 45 Milky Way Galaxy 45 spiral galaxy 45 gamma ray burst 45 WIMPs 45 celestial objects 45 planetoid 45 Scorpius 45 distant galaxy 45 super Earths 44 Photons 44 circular orbit 44 Venusian 44 habitable planets 44 globular cluster 44 ecliptic 44 Andromeda galaxy 44 microlensing 44 Leonids 44 Aurora Borealis 44 brown dwarf 43 celestial bodies 43 occultation 43 orbiting Saturn 43 Pulsars 43 Deimos 43 Milky Way 43 Planets 43 Gliese 43 Eta Carinae 43 Hinode 43 brown dwarfs 43 terrestrial planets 43 Large Magellanic Cloud 43 astronomical objects 42 ringed planet 42 Geminids 42 Gamma ray bursts 42 MODIS 42 Haumea 42 Perseids 42 Moderate Resolution 42 pulsars 42 Oceansat 2 42 ionized gas 42 optical telescope 42 supernovas 42 gamma ray bursts 42 Ursa Major 42 Uranus 42 Big Dipper 42 infrared wavelengths 42 ESO Very Large Telescope 42 Solar System 42 hot Jupiters 42 Nebula