NASA Astrobiology

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Emerging Trends in Comet Taxonomy. “Emerging trends and a comet taxonomy based on the volatile chemistry measured in thirty comets with high-resolution infrared spectroscopy between 1997 and 2013.” in Icarus

Cycles of Glaciation on Ancient Mars. “Climate Cycling on Early Mars Caused by the Carbonate-Silicate Cycle” in Earth and Planetary Astrophysics.

Methane Muted: How Did Early Earth Stay Warm?. “A proper accounting of biogeochemical cycles in the oceans reveals that methane has a much more powerful foe than oxygen.” in PNAS

Emerging Trends in Comet Taxonomy“Emerging trends and a comet taxonomy based on the volatile chemistry measured in thirty comets with high-resolution infrared spectroscopy between 1997 and 2013.” in Icarus01/03

Cycles of Glaciation on Ancient Mars“Climate Cycling on Early Mars Caused by the Carbonate-Silicate Cycle” in Earth and Planetary Astrophysics.02/03

Methane Muted: How Did Early Earth Stay Warm?“A proper accounting of biogeochemical cycles in the oceans reveals that methane has a much more powerful foe than oxygen.” in PNAS03/03

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June 2020The non-glacial and non-cratonic origin of an early Archean felsic volcaniclastic unit, Barberton Greenstone Belt, South Africa

Lowe, D. R., & Byerly, G. R. (2020). The non-glacial and non-cratonic origin of an early Archean felsic volcaniclastic unit, Barberton Greenstone Belt, South Africa. Precambrian Research, 341, 105647. doi:10.1016/j.precamres.2020.105647

March 2020Ferromanganese crusts as recorders of marine dissolved oxygen

Sutherland, K. M., Wostbrock, J. A. G., Hansel, C. M., Sharp, Z. D., Hein, J. R., & Wankel, S. D. (2020). Ferromanganese crusts as recorders of marine dissolved oxygen. Earth and Planetary Science Letters, 533, 116057. doi:10.1016/j.epsl.2019.116057

Wide but not ubiquitous distribution of glendonite in the Doushantuo Formation, South China: Implications for Ediacaran climate

Wang, Z., Chen, C., Wang, J., Suess, E., Chen, X., Ma, X., … Xiao, S. (2020). Wide but not ubiquitous distribution of glendonite in the Doushantuo Formation, South China: Implications for Ediacaran climate. Precambrian Research, 338, 105586. doi:10.1016/j.precamres.2019.105586

February 2020Uranium Isotope Fractionation (238U/235U) during U(VI) Uptake by Freshwater Plankton

Chen, X., Zheng, W., & Anbar, A. D. (2020). Uranium Isotope Fractionation (238U/235U) during U(VI) Uptake by Freshwater Plankton. Environmental Science & Technology. doi:10.1021/acs.est.9b06421

Constraining oceanic oxygenation during the Shuram excursion in South China using thallium isotopes

Fan, H., Nielsen, S. G., Owens, J. D., Auro, M., Shu, Y., Hardisty, D. S., … Wen, H. (2020). Constraining oceanic oxygenation during the Shuram excursion in South China using thallium isotopes. Geobiology. doi:10.1111/gbi.12379

Metabolic potentials of archaeal lineages resolved from metagenomes of deep Costa Rica sediments

Farag, I. F., Biddle, J. F., Zhao, R., Martino, A. J., House, C. H., & León-Zayas, R. I. (2020). Metabolic potentials of archaeal lineages resolved from metagenomes of deep Costa Rica sediments. The ISME Journal. doi:10.1038/s41396-020-0615-5

Reconstructing the evolutionary history of nitrogenases: Evidence for ancestral molybdenum‐cofactor utilization

Garcia, A. K., McShea, H., Kolaczkowski, B., & Kaçar, B. (2020). Reconstructing the evolutionary history of nitrogenases: Evidence for ancestral molybdenum‐cofactor utilization. Geobiology. doi:10.1111/gbi.12381

The Effect of Cosmic Rays on Cometary Nuclei. I. Dose Deposition

Gronoff, G., Maggiolo, R., Cessateur, G., Moore, W. B., Airapetian, V., De Keyser, J., … Hosseini, S. (2020). The Effect of Cosmic Rays on Cometary Nuclei. I. Dose Deposition. The Astrophysical Journal, 890(1), 89. doi:10.3847/1538-4357/ab67b9

Using Cathodic Poised Potential Experiments to Investigate Extracellular Electron Transport in the Crustal Deep Biosphere of North Pond, Mid-Atlantic Ridge

Jones, R. M., D’Angelo, T., & Orcutt, B. N. (2020). Using Cathodic Poised Potential Experiments to Investigate Extracellular Electron Transport in the Crustal Deep Biosphere of North Pond, Mid-Atlantic Ridge. Frontiers in Environmental Science, 8, None. doi:10.3389/fenvs.2020.00011

A compositionally heterogeneous martian mantle due to late accretion

Marchi, S., Walker, R. J., & Canup, R. M. (2020). A compositionally heterogeneous martian mantle due to late accretion. Science Advances, 6(7), eaay2338. doi:10.1126/sciadv.aay2338

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