Related by context. Frequent words. (Click for all words.) 58 spiral galaxies 56 planetary nebulae 56 elliptical galaxies 55 nebulae 55 dwarf galaxies 55 circular orbits 54 spiral galaxy 54 moonlets 54 rocky planets 54 hot Jupiters 53 blobs 53 Gamma ray bursts 53 planetary nebula 53 protoplanetary disk 53 active galactic nuclei 53 Milky Way Galaxy 53 ionized gas 53 Kuiper Belt objects 53 Saturn rings 52 baryons 52 globular 52 Gamma rays 52 sepals 52 globular cluster 52 constellation Leo 52 magnetars 52 whorls 52 dye molecules 51 Andromeda Galaxy 51 Cosmic rays 51 haloes 51 aurorae 51 geometrical shapes 51 planetesimals 51 Kuiper belt 51 meteoroids 51 WASP #b 51 silicates 51 planets 51 galaxies 51 bracts 51 lava tubes 51 filaments 50 globular clusters 50 reddish 50 4 chars 50 reddish hue 50 nuclei 50 Andromeda galaxy 50 Geminids 50 olivine 50 accretion disk 50 nebula 50 planet orbits 50 Oort Cloud 50 Jupiter Saturn Uranus 50 Valles Marineris 50 calcite 49 florets 49 starbursts 49 pentagons 49 clumped together 49 stamens 49 habitable zones 49 optical wavelengths 49 HD #b [002] 49 Crab Nebula 49 vortices 49 spherical shape 49 torus 49 lunar soil 49 spherules 49 star Gliese 49 roundish 49 outer crust 49 SWNTs 49 greenish yellow 49 igneous rocks 49 terrestrial planets 49 dwarf galaxy 49 yellowish 49 dwarf planets 49 lavas 49 anemone 49 iron oxides 48 placental mammals 48 Pulsars 48 ejecta 48 paillettes 48 brown dwarfs 48 landforms 48 dendrites 48 gravitationally 48 spherical 48 Saturn moons 48 constellation Perseus 48 crystals 48 striated 48 icy crust 48 moons 48 Jupiter Saturn