Related by context. Frequent words. (Click for all words.) 64 isotopic 57 anisotropy 56 anomalously 55 olivine 55 elliptical galaxies 55 fluxes 55 diatom 55 silicates 55 chemical composition 55 globular clusters 54 spectra 54 conductance 54 diatoms 54 mineralogy 54 sulfides 54 nuclei 54 velocities 53 ejecta 53 mid latitudes 53 X ray emission 53 morphological 53 super Earths 53 rocky planets 53 terrestrial planets 53 apatite 53 lake sediments 53 brown dwarfs 53 magmatic 52 taxa 52 amplitudes 52 conductivity 52 iron oxides 52 magnetization 52 basalts 52 electrical conductivity 52 chirality 52 redshift 52 calcite 51 dynamical 51 carbonaceous 51 phylogeny 51 lithology 51 eukaryotic 51 organic molecules 51 radiative 51 nucleation 51 morphology 51 dwarf galaxies 51 silicate 51 lithologies 51 concentrations 50 radioactive decay 50 planets orbiting 50 mRNA expression 50 luminosity 50 extrasolar planets 50 refractive index 50 sediment cores 50 planets 49 hydroxyl 49 zooplankton 49 galaxy clusters 49 geologic 49 supernova explosion 49 quasars 49 stable isotope 49 interstellar medium 49 cosmic microwave background 49 geomagnetic 49 Pliocene 49 geochemical 49 spectroscopic 49 galaxies 49 sediments 49 nitrogen fixation 49 volcanism 49 latitudes 49 particle sizes 49 densities 48 GRBs 48 supernova explosions 48 Ordovician 48 CO2 concentrations 48 oscillations 48 radiocarbon 48 luminescence 48 spectral 48 geochemistry 48 iridium 48 glaciation 48 yttrium 48 supernovae 48 adsorbed 48 Fig. 48 nebulae 48 Eta Carinae 48 Large Magellanic Cloud 48 hematite 48 ref. 48 phytoplankton 48 radiometric