Related by context. Frequent words. (Click for all words.) 55 Fomalhaut 54 planetary nebulae 54 constellation Leo 53 aurorae 52 Carina Nebula 52 Cepheids 52 celestial object 51 constellation 51 nebula 51 constellation Perseus 51 planetary nebula 51 Large Magellanic Cloud 51 polar vortex 50 Andromeda Galaxy 50 galaxy cluster 50 Supernovae 50 Cancri 50 nebulae 50 spiral galaxies 49 planet Uranus 49 Arcturus 49 constellation Gemini 49 auroral 49 Olympus Mons 49 ejecta 48 cirrus 48 distant galaxy 48 ecliptic 48 protoplanetary disk 48 accretion disk 48 Galaxy Evolution 48 moonlets 48 supernova remnant 48 cirrus clouds 48 celestial bodies 48 Orion Nebula 48 Valles Marineris 48 active galactic nuclei 48 Jupiter Saturn 48 cumulus clouds 48 WASP #b 47 GRB # 47 Eta Carinae 47 Cassiopeia 47 tropospheric 47 dwarf galaxy 47 clouds 47 colliding galaxies 47 aerosol particles 47 occultation 47 Mauna Kea Hawaii 47 VIRTIS 47 X ray emission 47 Sunspots 47 elliptical galaxies 47 equatorial 47 Iapetus 47 Lunar Eclipse 47 ionized gas 47 star Gliese 46 Andromeda galaxy 46 Kuiper belt 46 solar nebula 46 quasar 46 auroras 46 NASA Cassini 46 aurora 46 solar corona 46 Pleiades 46 Milky Way Galaxy 46 supernova explosion 46 supernova remnants 46 circular orbits 46 rocky planets 46 celestial objects 46 planetesimals 45 Nibiru 45 basalts 45 constellation Orion 45 constellations 45 photometer 45 supercontinent 45 galaxy formation 45 La Silla Chile 45 corona 45 spiral galaxy 45 Milky Way 45 Betelgeuse 45 novae 45 globular cluster 45 magnetar 45 Lulin 45 Very Large Telescope 45 reddish hue 45 meteoroids 45 comet tail 45 SIRTF 45 ultraviolet wavelengths 45 Sedna 45 volcanically active 45 magnetars