Related by context. Frequent words. (Click for all words.) 58 Bottke 53 Melosh 53 Niels Bohr Institute 52 Martian dust 51 planetary scientist 51 Melott 50 Lunine 50 Knauth 48 A'Hearn 48 NCAR scientist 48 Scambos 48 Zoback 47 atmospheric chemistry 47 meteoroid 47 atmospheric chemist 47 planetary geologist 46 Dessler 46 Tomasko 45 CfA 45 Filippenko 44 USGS geologist 44 Huettel 44 Robock 44 Cassini scientist 44 geochemist 44 planetary sciences 44 Zachos 44 spacetime 43 Kochen 43 Carnegie Observatories 43 University Lamont Doherty 43 Des Marais 43 geological sciences 43 Steenburgh 43 USGS seismologist 43 Cassini imaging 43 Pasachoff 43 Landsea 42 plate tectonics 42 Einstein theories 42 ejecta 42 Astrophysicist 42 Planetary Laboratory 42 Steig 42 geosciences professor 42 isotope ratios 42 Rignot 42 Steward Observatory 42 icy moons 41 meteorite impacts 41 Computer simulations 41 chemical oceanographer 41 Tinetti 41 Coauthor 41 atmospheric sciences 41 Cassini radar 41 astrophysical 41 atmospheric physicist 41 USGS scientist 41 Pielke 41 Alfred McEwen 40 Diffenbaugh 40 Paul Dirac 40 Changizi 40 mesosphere 40 photochemistry 40 physicist 40 Kasting 40 Chicxulub 40 quantum mechanical 40 biophysicist 40 positron 40 Derocher 40 clathrates 40 Sinervo 40 geophysicist 40 Physicist 40 Planetary Science Institute 40 Trenberth 40 Sweedler 40 Nature Geoscience 39 WASP #b 39 aerosol particles 39 Bibring 39 Cascades Volcano Observatory 39 Amstrup 39 Udry 39 decoherence 39 Widom 39 planetary science 39 astronomer 39 spherules 39 Brownian motion 39 geoscientist 39 oxygen isotopes 39 Zipser 39 geomorphology 39 Jonathan Overpeck 39 HiRISE 39 Kaspari 39 Granick