| المؤلفون: |
Rodriguez LE; NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA.; Lunar and Planetary Institute, Universities Space Research Association, Houston, Texas, USA. (Current)., Altair T; Institute of Chemistry of São Carlos, Universidade de São Paulo, São Carlos, Brazil.; Department of Chemistry, College of the Atlantic, Bar Harbor, Maine, USA. (Current)., Hermis NY; NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA.; Department of Physics and Space Sciences, University of Granada, Granada Spain. (Current)., Jia TZ; Earth-Life Science Institute, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo, Japan.; Blue Marble Space Institute of Science, Seattle, Washington, USA., Roche TP; School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia, USA., Steller LH; Australian Centre for Astrobiology, and School of Biological, Earth and Environmental Sciences, University of New South Wales, Kensington, Australia., Weber JM; NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA. |
| مستخلص: |
Within the first billion years of Earth's history, the planet transformed from a hot, barren, and inhospitable landscape to an environment conducive to the emergence and persistence of life. This chapter will review the state of knowledge concerning early Earth's (Hadean/Eoarchean) geochemical environment, including the origin and composition of the planet's moon, crust, oceans, atmosphere, and organic content. It will also discuss abiotic geochemical cycling of the CHONPS elements and how these species could have been converted to biologically relevant building blocks, polymers, and chemical networks. Proposed environments for abiogenesis events are also described and evaluated. An understanding of the geochemical processes under which life may have emerged can better inform our assessment of the habitability of other worlds, the potential complexity that abiotic chemistry can achieve (which has implications for putative biosignatures), and the possibility for biochemistries that are vastly different from those on Earth. |
