Related by context. Frequent words. (Click for all words.) 55 Hubble observations 52 A'Hearn 51 microlensing 51 solar nebula 50 Computer simulations 50 Melosh 50 oxygen isotopes 50 isotopic composition 50 isotopic 50 Cassini imaging 50 paleoanthropologist 49 mid latitudes 49 abundances 49 biogeochemistry 49 geochemist 49 Keck Observatory 49 X ray emission 49 geology 49 Gliese #g 49 astronomers 49 Nature Geoscience 49 volcanism 49 Niels Bohr Institute 49 aerosol particles 49 geochemistry 49 magnetic reconnection 49 gravitational lensing 48 numerical simulations 48 astronomical observations 48 solar corona 48 MARSIS 48 glaciation 48 marine sediments 48 zircons 48 Geochemistry 48 CfA 47 Paabo 47 lavas 47 sediment cores 47 mineralogy 47 lithosphere 47 University Lamont Doherty 47 Serreze 47 geologic 47 planetary science 47 ejecta 47 exoplanet 47 O'Dor 47 geomorphology 47 hydrothermal activity 46 high temperature superconductivity 46 astrophysicists 46 planets circling 46 Poinar 46 lake sediments 46 journal Geology 46 Astrophysicists 46 geologically active 46 Geophysical Research 46 extrasolar planet 46 geological sciences 46 NASA Cassini spacecraft 46 equatorial regions 46 atmospheric methane 45 geoscientist 45 globular clusters 45 planetary scientist 45 geological 45 Saturn rings 45 polar caps 45 journal Geophysical Research 45 cometary 45 elliptical galaxies 45 redshift 45 planet orbiting 45 WM Keck Observatory 45 ESRF 45 galaxy formation 45 glacial melt 45 foraminifera 45 atmospheric chemistry 45 evolutionary biologists 45 glaciologist 45 geophysicists 45 Geophysics 45 super Earths 45 plate tectonics 45 Sedna 45 Meridiani 45 HiRISE 45 Worobey 45 cosmic ray 45 geophysics 45 auroral 45 spherules 45 supernova explosion 45 continental crust 45 palaeontologist 44 astrobiologists 44 Bahcall 44 terrestrial planets