Sarah A. Fagents

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

Eleni Maria Ravanis, C. C. Bedford, B. Horgan, B. Garczynski et autres

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. The NASA Mars 2020 Perseverance rover …

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From discrete explosions to continuous fountains: quantifying contrasting explosive regimes at a single fissure from Kīlauea's 2018 lower East Rift Zone eruption

Caroline Michelle Tisdale, Bruce F. Houghton, Matthew R. Patrick, Edward W. Llewellin et autres

Carbonated ultramafic igneous rocks in Jezero crater, Mars

Kenneth H. Williford, Kenneth Anthony Farley, Briony H. N. Horgan, Bradley Garczynski et autres

The Perseverance rover landed in Jezero crater on Mars, which once contained a lake of liquid water. We report the rock properties encountered by Perseverance during a 10-kilometer traverse extending over 400 meters in elevation, from beneath Jezero's western sedimentary fan to …

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Titan's Lithospheric Strength Envelope and Brittle–Ductile Transition: The Importance of Crustal Pore Fluids, Organics, and Clathrates

L. R. Schurmeier, Sarah A. Fagents

Abstract The strength and thickness of Titan's lithosphere is likely influenced by its unique organic‐rich crust. Titan's crust may be composed of water ice or a more insulating layer of methane clathrate (MC), and topped by potentially insulating surface deposits such as …

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Topographic Relaxation of Complex Impact Craters in a Clathrate Crust on Titan

Gwendolyn E. Brouwer, L. R. Schurmeier, Sarah A. Fagents, V. J. Bray et autres

Abstract Titan’s impact craters are significantly shallower than fresh craters on Ganymede, which are often used as templates for fresh craters on Titan. The presence of a clathrate crust on Titan, which would insulate the ice shell and maintain warmer ice near …

Correction to: Photogeologic Map of the Perseverance Rover Field Site in Jezero Crater Constructed by the Mars 2020 Science Team

Kathryn M. Stack, Nathan Robert Williams, Fred John Calef, Vivian Zheng Sun et autres

International audience

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Contributors

Cesar L. Bertucci, Samuel Birch, Nathalie Carrasco, Athena Coustenis et autres

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Exchange processes between surface, atmosphere, and interior

Steven Douglas Vance, Álvaro Penteado Crósta, Mohit Melwani Daswani, Sarah A. Fagents et autres

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An Endogenic Origin for Titan's Rampart Craters: Assessment of Explosion Mechanisms

Gwendolyn E. Brouwer, L. R. Schurmeier, Sarah A. Fagents

Abstract Rampart craters are a class of lakes or depressions in Titan's north polar region that have morphological attributes suggestive of an explosive origin. Two previous studies have proposed that rampart craters form via nitrogen or methane vapor explosions analogous to terrestrial …

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Rapid Impact Crater Relaxation Caused by an Insulating Methane Clathrate Crust on Titan

L. R. Schurmeier, Gwendolyn E. Brouwer, Jonathan P. Kay, Sarah A. Fagents et autres

Abstract Titan’s impact craters are hundreds of meters shallower than expected, compared to similar-sized craters on Ganymede. Only 90 crater candidates have been identified, the majority of which have low certainty of an impact origin. Many processes have been suggested to shallow, …

The Habitability of Hydrocarbon Words: Titan and Beyond

R. M. C. Lopes, Michael J. Malaska, Vance Steven, Meyer-Dombard Darcy et autres

Titan is an ocean world, an icy world, and an organic world. We consider that Titan’s subsurface ocean and ductile ice are the most likely habitable environments on the moon. The ocean may be in contact with an organic-rich ice-rock core, potentially …

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Could Life Have Started on Mars? Planetary Conditions That Assemble and Destroy Protocells

Francesca Cary, David W. Deamer, Bruce Damer, Sarah A. Fagents et autres

Early Mars was likely habitable, but could life actually have started there? While cellular life emerged from prebiotic chemistry through a pre-Darwinian selection process relevant to both Earth and Mars, each planet posed unique selection ‘hurdles’ to this process. We focus on …

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