作者：Clery, Daniel
摘要：Triple measurement of the Hubble constant using JWST suggests universe doesn't need new physics
作者：Fischer-Goedde, Mario; Tusch, Jonas; Goderis, Steven; Bragagni, Alessandro; Mohr-Westheide, Tanja; Messling, Nils; Elfers, Bo-Magnus; Schmitz, Birger; Reimold, Wolf U.; Maier, Wolfgang D.; Claeys, Philippe; Koeberl, Christian; Tissot, Francois L. H.; Bizzarro, Martin; Muenker, Carsten
作者单位：University of Cologne; Vrije Universiteit Brussel; University of Florence; Consiglio Nazionale delle Ricerche (CNR); Istituto di Scienze Marine (ISMAR-CNR); Leibniz Institut fur Evolutions und Biodiversitatsforschung; University of Gottingen; Hamburg University of Technology; Lund University; Universidade de Brasilia; Cardiff University; University of Vienna; California Institute of Technology; University of Copenhagen
摘要：An impact at Chicxulub, Mexico, occurred 66 million years ago, producing a global stratigraphic layer that marks the boundary between the Cretaceous and Paleogene eras. That layer contains elevated concentrations of platinum-group elements, including ruthenium. We measured ruthenium isotopes in samples taken from three Cretaceous-Paleogene boundary sites, five other impacts that occurred between 36 million to 470 million years ago, and ancient 3.5-billion- to 3.2-billion-year-old impact spheru...
