In Martian carbon found extreme negative isotope shift

"Kyyuriositi's" mars rover found in the methane emitted from tests of sedimentary breeds of a crater of Gayle, high variability of isotope composition of carbon. Thus the majority of measurements point to sharply lowered content of carbon-13, especially in relation to the modern Martian atmosphere. In article published in Magazine National academy sciences United States of America "Proceedings of the National Academy of Sciences", authors of research offered three possible reasons of large negative anomalies of an isotope signature of carbon arising in the past. It fotoliz biogenous methane, photochemical restoration of atmospheric carbonic acid and...