Related by context. Frequent words. (Click for all words.) 67 globular clusters 63 globular cluster 63 planetary nebulae 60 hot Jupiters 58 protoplanetary disk 58 elliptical galaxies 58 galaxies 57 planetesimals 57 moonlets 57 supernova remnants 57 Kuiper belt 57 Kuiper Belt objects 57 nebulae 57 supernova explosions 57 solar nebula 56 Oort Cloud 56 active galactic nuclei 56 terrestrial planets 56 rocky planets 56 Milky Way galaxy 56 single celled organisms 56 spiral galaxies 56 planetary nebula 55 colliding galaxies 55 stromatolites 55 dwarf galaxies 55 agglomerations 54 Milky Way Galaxy 54 WASP #b 54 magnetars 54 brown dwarfs 54 clumped together 54 dwarf galaxy 54 comets 54 meteoroids 54 Andromeda galaxy 53 habitable zones 53 single celled 53 distant galaxies 53 interstellar dust 53 galaxy clusters 53 neutron stars 53 prokaryotes 53 Gamma ray bursts 53 Milky Way 53 supernovae 53 Kuiper Belt 53 ionized gas 52 planets 52 super Earths 52 spherules 52 quasars 52 ejecta 52 silicates 52 supernova explosion 52 Saturn moons 51 Cepheids 51 trilobites 51 nuclei 51 planet orbits 51 astronomical objects 51 pentagons 51 morphologies 51 placental mammals 51 foraminifera 51 Valles Marineris 51 multicellular organisms 51 galaxy formation 51 habitable planets 51 interstellar medium 51 marine sediments 51 supermassive black holes 51 salt crystals 50 igneous rock 50 nebula 50 Saturn rings 50 galaxy 50 supercontinent 50 accreting 50 globular 50 accretion disk 50 calcite 50 dense 50 melanosomes 50 dwarf planets 50 Orion Nebula 50 sedimentary rock 50 organic molecules 50 filaments 50 lava tubes 50 starbursts 50 particle detectors 50 nanosized 50 igneous rocks 50 baryons 50 calcareous 50 hydrothermal vent 49 Cancri 49 Jupiter Saturn Uranus 49 Ultraviolet light 49 lunar soil