Related by context. Frequent words. (Click for all words.) 56 supernova explosion 54 WASP #b 54 planetary nebulae 54 lava tubes 54 gravitationally 53 accretion disk 53 silicates 53 dwarf galaxy 53 globular cluster 53 magnetars 53 planetary nebula 53 accreting 52 Oort Cloud 52 interstellar medium 52 Eta Carinae 51 dwarf galaxies 51 Andromeda galaxy 51 solar nebula 51 magnetar 51 elliptical galaxies 51 supernova remnant 51 supernova explosions 51 ejecta 51 rocky planets 50 planet orbits 50 radial velocity 50 olivine 50 spherules 50 ionized gas 50 nebula 50 supernova remnants 50 Milky Way Galaxy 50 planets 50 galaxy 50 Crab Nebula 50 silicate 49 observable universe 49 salt crystals 49 lunar soil 49 galaxies 49 distant galaxy 49 comet nucleus 49 Martian rocks 49 galaxy cluster 49 galaxy clusters 49 neutron star 49 nebulae 49 Orion Nebula 49 habitable zones 49 colliding galaxies 49 clasts 49 brown dwarfs 49 Valles Marineris 49 polar vortex 49 Kuiper belt 48 planet orbiting 48 craters 48 calcite 48 globular clusters 48 supernovas 48 visible wavelengths 48 supergiant 48 brown dwarf 48 neutron stars 48 planets orbiting 48 ionised 48 active galactic nuclei 48 earths 48 galactic 48 orbiting planets 48 Milky Way galaxy 48 Large Magellanic Cloud 48 galaxy formation 48 haloes 48 rock outcrop 48 super Earths 48 interstellar dust 48 rocks 47 HD #b [002] 47 outer crust 47 radioactive decay 47 terrestrial planets 47 Hubble observations 47 landmasses 47 spiral galaxies 47 Saturn moons 47 comet tail 47 gravitational tug 47 Jupiter moons 47 Fomalhaut 47 Andromeda Galaxy 47 Gamma rays 46 innermost planet 46 distant galaxies 46 igneous rock 46 spherical 46 Martian equator 46 X ray emission 46 termite mounds 46 supernova 46 crater