Results 71 to 80 of about 9,833 (194)

Stratigraphy of Carbonate‐Bearing Rocks at the Margin of Jezero Crater, Mars: Evidence for Shoreline Processes?

Journal of Geophysical Research: Planets, Volume 131, Issue 1, January 2026.
Abstract Martian carbonate‐bearing rocks are compelling targets for exploration because they preserve detailed records of past aqueous processes, climate, and habitability. The Margin unit in Jezero crater is a distinct olivine‐ and carbonate‐bearing unit stratigraphically underlying the western fan, lining the inner margin of the western crater rim ...
Alexander J. Jones, Sanjeev Gupta, Robert Barnes, Briony H. N. Horgan, Kenneth H. Williford, Gerhard Paar, Kathryn. M. Stack, Bradley J. Garzcynski, Eleni Ravanis, Candice C. Bedford, Justin I. Simon, Athanasios Klidaras, Linda C. Kah, James F. Bell, Justin Maki, Stephen W. Lokier, Adrian Brown, Nathan R. Williams, Sanna Alwmark, Jorge I. Núñez, Fred Calef, Larry Crumpler, Alicia Vaughan, Libby R. W. Ives, Sam Gwizd, Ken Farley, Christian Tate, Nicolas Randazzo, Olivier Beyssac, Gwénaël Caravaca   +29 more
wiley   +1 more source

Biosignature hide and seek [PDF]

Nature Astronomy, 2018
A new model predicts locations on the surface of radiation-blasted Europa, the ocean moon of Jupiter, where biochemical signatures of life emergent from the subsurface ocean might survive long enough for detection on the moon's changing surface.
openaire   +2 more sources

Formation and Alteration of Olivine‐Carbonate Rocks Within Jezero Crater as Constrained by In Situ Visible/Near‐Infrared Multispectral Images

Journal of Geophysical Research: Planets, Volume 131, Issue 1, January 2026.
Abstract Olivine‐ and carbonate‐bearing rocks are key exploration targets on Mars because of the information they can provide about magma evolution and source characteristics, implications for surface water availability and climate, and their biosignature preservation potential.
E. Ravanis, C. C. Bedford, B. Horgan, B. Garczynski, A. Vaughan, J. R. Johnson, M. Rice, A. J. Jones, S. Fagents, A. Klidaras, S. Gupta, J. Núñez, K. Lapo, E. A. Cloutis, J. F. Bell III, R. C. Wiens, A. Brown   +16 more
wiley   +1 more source

Short‐Term Effect of Mars‐Like Radiation on Carbon and Oxygen Isotope Compositions of Carbonates

Journal of Geophysical Research: Planets, Volume 131, Issue 1, January 2026.
Abstract The stable isotope composition of carbonates records the environmental formation conditions and can indicate potential biosignatures if formed biologically. Martian meteorite carbonates display unusually high δ13C values, not explained using known terrestrial processes.
Nicolas Randazzo, Sang‐Tae Kim, Fabien Stalport, Maikel C. Rheinstäder, Hervé Cottin, Patrice Coll   +5 more
wiley   +1 more source

Nonphotosynthetic Pigments as Potential Biosignatures [PDF]

Astrobiology, 2015
21 pages, 12 figures, 5 tables.
Schwieterman, Edward W, Cockell, Charles S, Meadows, Victoria S   +2 more
openaire   +6 more sources

Tides and the Evolution of Planetary Habitability

, 2008
Tides raised on a planet by its host star's gravity can reduce a planet's orbital semi-major axis and eccentricity. This effect is only relevant for planets orbiting very close to their host stars.
Brian Jackson, Delfosse X., Gorda S.Yu., Hut P., Naef D., Richard Greenberg, Rory Barnes, Sean N. Raymond   +7 more
core   +1 more source

Ferromagnesian Clay Diversity Across Mars' Crustal Dichotomy: A Window Into Early Aqueous Environments

Journal of Geophysical Research: Planets, Volume 131, Issue 1, January 2026.
Abstract Extensive research over the past two decades has shown that early Mars likely had a warmer, wetter climate with widespread water activity. Ferromagnesian (Fe,Mg‐rich) clay deposits are compelling markers of these ancient environments, helping reconstruct Mars' hydrologic evolution, assess past habitability, and guide future exploration.
Jeremy Brossier, Francesca Altieri, Maria Cristina De Sanctis, Alessandro Frigeri, Marco Ferrari, Simone De Angelis, Enrico Bruschini, Monica Rasmussen, Janko Trisic Ponce   +8 more
wiley   +1 more source

Interpretable Machine Learning Biosignature Detection From Ocean Worlds Analogue CO2 Isotopologue Data

Earth and Space Science
Future missions to icy ocean worlds (OW) such as Europa and Enceladus will evaluate the habitability and potential for biosignatures on these worlds. These missions will benefit from autonomous science and machine learning (ML) methods to process high ...
Lily A. Clough, Victoria DaPoian, Jonathan D. Major, Lauren M. Seyler, Brett A. McKinney, Bethany P. Theiling   +5 more
doaj   +1 more source

A Fluvio‐Lacustrine Environment Preserved in the Jezero Crater Inlet Channel, Neretva Vallis, Mars

Journal of Geophysical Research: Planets, Volume 131, Issue 1, January 2026.
Abstract Martian fluvial valleys provide evidence for the surface flow of liquid water, making them a key target for rover‐based investigations of ancient habitability. The Mars 2020 Perseverance rover spent ∼85 sols exploring the Bright Angel formation, exposed across the floor of Neretva Vallis: the western inlet channel of Jezero crater.
Alexander J. Jones, Robert Barnes, Sanjeev Gupta, Gerhard Paar, Joel Hurowitz, Brittan V. Wogsland, Adrian Broz, Hemani Kalucha, Athanasios Klidaras, Kathryn M. Stack, Patrick Russell, Briony Horgan, Bradley Garczynski, Melissa Rice, James F. Bell III, Jusin N. Maki, Svein‐Erik Hamran, Alicia Vaughan, Justin I. Simon, Oak Kanine, Stephanie A. Connell, Henry Manelski, Ashley Murphy, Olivier Beyssac, Nicolas Mangold, Olivier Gasnault, Christoph Traxler, Adrian Brown, David Flannery, Nicolas Randazzo, Jesús Martínez‐Frías, Kenneth A. Farley   +31 more
wiley   +1 more source

Detecting Biosignatures in Complex Molecular Mixtures From Pyrolysis‐Gas Chromatography‐Mass Spectrometry Data Using Machine Learning

Journal of Geophysical Research: Machine Learning and Computation
Understanding how measured molecular signals can distinguish the chemistry of life from the chemistry of the nonliving world is a central focus of astrobiology and paleobiology.
Grethe Hystad, H. James Cleaves II, Collin A. Garmon, Michael L. Wong, Anirudh Prabhu, George D. Cody, Robert M. Hazen   +6 more
doaj   +1 more source