NASA Astrobiology

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A volcanically active planet is shown in closeup at the left side of the image with glowing eruptions and lines of lava on the surface. To the right and in the distance is a faint blue glowing ball representing the more massive planet in the system.

Sixteen frames from Voyager 1's flyby of Jupiter in 1979 were merged to create this image. Jupiter's Great Red Spot is visible in the center. Jupiter's moon Europa can be seen in the foreground at the bottom left of the image.

The frame is a horizontal rainbow of color on a grid. Shadows of molecules can be seen through the light as well as the jagged peaks and troughs of spectral lines.

Fizzy Super Earths and Lava Worlds“Fizzy Super-Earths: Impacts of Magma Composition on the Bulk Density and Structure of Lava Worlds.” in The Astrophysical Journal.01/03

Identifying Hydrothermal Activity on Icy Ocean Worlds“Ethene-ethanol ratios as potential indicators of hydrothermal activity at Enceladus, Europa, and other icy ocean worlds.” In Icarus.02/03

NASA Raman Spectroscopic Database"The NASA Raman spectroscopic database: Ramdb version 1.00.” In Icarus.03/03

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December 2019Surface resistance to SSVs and SIRVs in pilin deletions of Sulfolobus islandicus

Rowland, E. F., Bautista, M. A., Zhang, C., & Whitaker, R. J. (2019). Surface resistance to SSVs and SIRVs in pilin deletions of Sulfolobus islandicus. Molecular Microbiology. doi:10.1111/mmi.14435

Subglacial meltwater supported aerobic marine habitats during Snowball Earth

Lechte, M. A., Wallace, M. W., Hood, A. v. S., Li, W., Jiang, G., Halverson, G. P., … Planavsky, N. J. (2019). Subglacial meltwater supported aerobic marine habitats during Snowball Earth. Proceedings of the National Academy of Sciences, None, 201909165. doi:10.1073/pnas.1909165116

Probable cold and alkaline surface environment of the Hadean Earth caused by impact ejecta weathering

Kadoya, S., Krissansen‐Totton, J., & Catling, D. C. (2019). Probable cold and alkaline surface environment of the Hadean Earth caused by impact ejecta weathering. Geochemistry, Geophysics, Geosystems. doi:10.1029/2019gc008734

Application of Thallium Isotopes

Owens, J. D. (2019). Application of Thallium Isotopes. None. doi:10.1017/9781108688697

Free and kerogen‐bound biomarkers from late Tonian sedimentary rocks record abundant eukaryotes in mid‐Neoproterozoic marine communities

Zumberge, J. A., Rocher, D., & Love, G. D. (2019). Free and kerogen‐bound biomarkers from late Tonian sedimentary rocks record abundant eukaryotes in mid‐Neoproterozoic marine communities. Geobiology. doi:10.1111/gbi.12378

Great Oxidation and Lomagundi events linked by deep cycling and enhanced degassing of carbon

Eguchi, J., Seales, J., & Dasgupta, R. (2019). Great Oxidation and Lomagundi events linked by deep cycling and enhanced degassing of carbon. Nature Geoscience, 13(1), 71–76. doi:10.1038/s41561-019-0492-6

Mutations that improve efficiency of a weak-link enzyme are rare compared to adaptive mutations elsewhere in the genome

Morgenthaler, A. B., Kinney, W. R., Ebmeier, C. C., Walsh, C. M., Snyder, D. J., Cooper, V. S., … Copley, S. D. (2019). Mutations that improve efficiency of a weak-link enzyme are rare compared to adaptive mutations elsewhere in the genome. eLife, 8, None. doi:10.7554/elife.53535

Negative frequency‐dependent selection maintains coexisting genotypes during fluctuating selection

Turner, C. B., Buskirk, S. W., Harris, K. B., & Cooper, V. S. (2019). Negative frequency‐dependent selection maintains coexisting genotypes during fluctuating selection. Molecular Ecology, 29(1), 138–148. doi:10.1111/mec.15307

November 2019Helium, inorganic and organic carbon isotopes of fluids and gases across the Costa Rica convergent margin

Barry, P. H., Nakagawa, M., Giovannelli, D., Maarten De Moor, J., Schrenk, M., Seltzer, A. M., … Lloyd, K. G. (2019). Helium, inorganic and organic carbon isotopes of fluids and gases across the Costa Rica convergent margin. Scientific Data, 6(1), None. doi:10.1038/s41597-019-0302-4

Breaking the centrifugal barrier to giant planet contraction by magnetic disc braking

Ginzburg, S., & Chiang, E. (2019). Breaking the centrifugal barrier to giant planet contraction by magnetic disc braking. Monthly Notices of the Royal Astronomical Society: Letters, 491(1), L34–L39. doi:10.1093/mnrasl/slz164

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