Related by context. Frequent words. (Click for all words.) 59 ejecta 57 asteroid 56 supernova explosion 56 volcanism 55 meteorite 54 supernova remnant 54 meteor 53 mass extinction 53 comet 52 Tunguska 51 olivine 51 comet nucleus 50 geologically active 50 GRBs 49 cometary 49 geologic 49 glaciation 49 landmasses 49 crater 49 X ray emission 49 Saturn rings 49 Sedna 48 Eta Carinae 48 asteroids 48 gamma ray burst 48 polar caps 48 dwarf galaxy 48 HD #b [002] 48 galaxy cluster 48 planet orbiting 48 Enceladus 48 sedimentary rock 48 terrestrial planets 47 craters 47 greenhouse warming 47 mass extinctions 47 Iapetus 47 Apophis 47 Milky Way Galaxy 47 coronal mass ejection 47 cosmic rays 47 isotopic 47 spacetime 47 meteorites 46 silicates 46 distant galaxy 46 journal Geology 46 gravitational wave 46 caldera 46 cosmic ray 46 Precambrian 46 plate tectonics 46 galaxy clusters 46 supernova explosions 46 supernova 46 Einstein theory 46 Jupiter moons 46 Comet Tempel 1 46 rocky planets 46 crustal 45 volcanoes 45 basalt 45 globular clusters 45 Earth crust 45 discoverers 45 Large Magellanic Cloud 45 volcanic crater 45 University Lamont Doherty 45 biosphere 45 volcanic 45 LCROSS 45 exoplanet 45 X ray Observatory 45 subduction zone 45 lava flows 45 planetary scientist 45 volcanic rock 45 impactor 45 comets 45 quasar 45 magnetosphere 45 hydrothermal 45 Asteroid 45 interstellar dust 45 quasars 45 subduction zones 45 supermassive black hole 45 magmatic 45 geophysicists 45 neutrino 44 astronomers 44 hydrothermal vents 44 pulsar 44 Nature Geoscience 44 elliptical galaxies 44 redshift 44 megafauna 44 Kuiper Belt 44 Milky Way galaxy 44 geological formations 44 geological