Related by context. Frequent words. (Click for all words.) 65 interstellar medium 65 solar nebula 64 nebula 63 accretion disk 62 elliptical galaxies 61 Andromeda galaxy 61 galaxies 61 Kuiper belt 61 supernova explosion 61 rocky planets 60 planets 60 Crab Nebula 60 Milky Way Galaxy 60 interstellar dust 60 Milky Way galaxy 60 galaxy formation 60 supernova explosions 60 heliosphere 60 globular cluster 59 neutron star 59 dwarf galaxy 59 galaxy clusters 59 spacetime 59 distant galaxy 59 nebulae 59 galaxy 58 supernova remnant 58 globular clusters 58 Orion Nebula 58 Saturn moons 58 terrestrial planets 58 Earth magnetosphere 58 galaxy cluster 58 filaments 58 ionized gas 57 planet orbits 57 magnetar 57 X ray emission 57 planet orbiting 57 magnetosphere 57 supermassive black holes 57 universe 56 dwarf galaxies 56 Andromeda Galaxy 56 Saturn rings 56 supermassive black hole 56 cosmic dust 56 distant galaxies 56 spiral galaxies 56 gravitationally 56 Gamma ray bursts 56 brown dwarf 56 cosmic microwave background 56 habitable planet 56 hot Jupiters 55 ringed planet 55 nuclei 55 neutron stars 55 Spitzer Space Telescope 55 vortices 55 Milky Way 55 Eta Carinae 55 Large Magellanic Cloud 55 HD #b [002] 55 supernovas 55 comet nucleus 55 brown dwarfs 55 silicates 55 quark gluon plasma 54 observable universe 54 magnetic fields 54 astronomical objects 54 cosmos 54 planets orbiting 54 spiral galaxy 54 GRBs 54 vortexes 54 Kuiper Belt 54 torus 54 interstellar space 54 planetoid 54 habitable planets 54 cometary 54 quasars 54 supernova 54 ejecta 54 celestial object 53 Saturn moon Enceladus 53 astrophysical 53 gravitational attraction 53 comets 53 atomic nucleus 53 accreting 53 constellation Leo 53 extrasolar planet 53 pulsar 53 comet 53 cosmic 53 Enceladus 53 Cancri 53 dynamical