Related by context. Frequent words. (Click for all words.) 60 meteorites 59 solar nebula 59 olivine 59 zircons 58 magnetar 57 lunar soil 57 supernova explosion 57 marine sediments 57 Meridiani 57 ejecta 55 meteorite 55 comets 55 microfossils 55 silicates 54 spherules 54 comet Wild 54 Kuiper belt 54 dwarf galaxy 54 dwarf galaxies 54 organic molecules 54 oxygen isotopes 54 globular cluster 53 archaea 53 supercontinent 53 comet nucleus 53 subatomic particle 53 regolith 52 Voyager spacecraft 52 lavas 52 radioactive decay 52 adenine 52 GRB # 52 nanodiamonds 52 comet dust 52 atmospheric methane 52 super Earths 52 terrestrial planets 52 supernova explosions 52 cometary 51 comet 51 meteoroid 51 aerosol particles 51 asteroid 51 Itokawa 51 meteoroids 51 globular clusters 51 Titan Saturn 51 atomic nuclei 51 GRBs 51 isotopic 51 continental crust 51 cosmic ray 51 apatite 51 rocky planets 51 planetary nebula 50 nuclei 50 primordial soup 50 asteroids 50 quark gluon plasma 50 Cabeus crater 50 interstellar dust 50 diatoms 50 HD #b [002] 50 oceanic crust 50 Gliese #g 50 interstellar medium 50 Saturn rings 50 glycine 50 galaxy cluster 50 supernova remnants 50 Opportunity rover 50 sedimentary rock 49 extrasolar planet 49 earth crust 49 Stardust spacecraft 49 X ray emission 49 prebiotic 49 gamma ray burst 49 observable universe 49 Haumea 49 deuterium 49 hydroxyl 49 single celled organisms 49 amino acids 49 atomic nucleus 49 antiprotons 49 supernovae 49 cosmic rays 49 Large Magellanic Cloud 48 fragments 48 Martian soil 48 planetoid 48 Neanderthal DNA 48 dinosaur footprints 48 Meteorites 48 equatorial regions 48 americium 48 Kuiper Belt 48 Crab Nebula 48 hematite 48 Saturn moon