A5027322380- Planetary Science and Exploration
- Astro and Planetary Science
- Geology and Paleoclimatology Research
- Space Science and Extraterrestrial Life
- Space Exploration and Technology
- Maritime and Coastal Archaeology
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Geological Formations and Processes Exploration
- Spaceflight effects on biology
- Mineral Processing and Grinding
- Archaeology and ancient environmental studies
- Advanced X-ray and CT Imaging
- Spacecraft Design and Technology
- Atmospheric Ozone and Climate
- Marine and environmental studies
- Asian Culture and Media Studies
- Spacecraft Dynamics and Control
- Geological Modeling and Analysis
- Impact of Technology on Adolescents
- Astronomy and Astrophysical Research
- Mining and Gasification Technologies
- Space exploration and regulation
- Image and Object Detection Techniques
- Ancient and Medieval Archaeology Studies
Jet Propulsion Laboratory
2021-2025
University of Washington
2015-2022
Earth and Space Research
2015-2022
NASA Astrobiology Institute
2019-2021
Seattle University
2020
Cornell University
2012
Perseverance images of a delta on Mars The rover landed in Jezero crater, Mars, February 2021. Earlier orbital showed that the crater contains an ancient river was deposited by water flowing into lake billions years ago. Mangold et al . analyzed taken shortly after landing show distant cliff faces at edge delta. exposed stratigraphy and sizes boulders allowed them to determine past level discharge rates. An initially steady flow transitioned intermittent floods as planet dried out. This...
Abstract The first samples collected by the Perseverance rover on Mars 2020 mission were from Maaz formation, a lava plain that covers most of floor Jezero crater. Laboratory analysis these back Earth would provide important constraints petrologic history, aqueous processes, and timing key events in However, interpreting requires detailed understanding emplacement modification history formation. Here we synthesize orbital remote sensing data to link outcrop‐scale interpretations broader...
Abstract During the first year of NASA's Mars 2020 mission, Perseverance rover has investigated dark crater floor unit Jezero and four samples this have been collected. The focus paper is to assess potential these calibrate crater‐based Martian chronology. We review previous estimation model age unit. Then, we investigate impact density distribution across It reveals that heterogeneous from areas which exposed bombardment during last 3 Ga very recently bombardment. suggests a complex history...
Geological activity is thought to be important for the origin of life and maintaining planetary habitability. We show that transient sulfate aerosols could a signature exoplanet volcanism, therefore geologically active world. A detection aerosols, if linked thus aid in habitability evaluations exoplanet. On Earth, subduction-induced explosive eruptions inject SO2 directly into stratosphere, leading formation with lifetimes months years. demonstrate rapid increase gradual decrease aerosol...
Abstract Mars’ controversial hypothesized ocean shorelines have been found to deviate significantly from an expected equipotential surface. While multiple deformation models proposed explain the wide range of elevations, here we show that historical locations used in literature and these vary widely. We find most commonly version Arabia Level does not follow originally described contact can laterally by ∼500 km Deuteronilus Mensae. A meta‐analysis different published maps shows that,...
Whether extant life exists in the martian subsurface is an open question. High concentrations of photochemically produced CO and H2 otherwise oxidizing atmosphere represent untapped sources biologically useful free energy. These out-of-equilibrium species diffuse into regolith, so microbes could use them as a source energy carbon. Indeed, oxidation methanogenesis are relatively simple evolutionarily ancient metabolisms on Earth. Consequently, assuming CO- or H2- consuming would evolve Mars,...
Abstract Primary support for ancient Martian oceans has relied on qualitative interpretations of hypothesized shorelines relatively low‐resolution images and data. We present a toolkit quantitatively identifying paleoshorelines using topographic, morphological, spectroscopic evaluations. In particular, we apply the validated topographic expression analysis Hare et al. (2001, https://doi.org/10.1029/2001JB000344 ) first time beyond Earth, focusing test case putative shoreline features along...
Abstract Boulder‐sized clasts are common on the surface of Mars, and many sufficiently large to be resolved by high resolution imaging science experiment (HiRISE) camera aboard Mars reconnaissance orbiter. The size, number, location boulders their spatial distribution can reveal processes that have operated surface, including boulder erosion, burial, impact excavation, other mechanisms transport generation. However, quantitative analysis statistically significant populations, which could...
Earth and Space Science Open Archive This preprint has been submitted to is under consideration at Journal of Geophysical Research - Planets. ESSOAr a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing the latest version by default [v2]Where Mars' Hypothesized Ocean Shorelines? Large Lateral Topographic Offsets Between Different Versions Paleoshoreline Maps.AuthorsSteven FSholesiDZachary...
The first samples collected by the Perseverance rover on Mars 2020 mission were from Maaz formation, a lava plain that covers most of floor Jezero crater. Laboratory analysis these back Earth will provide important constraints petrologic history, aqueous processes, and timing key events in Jezero. However, interpreting require detailed understanding emplacement modification history formation. Here we synthesize orbital remote sensing data to link outcrop-scale interpretations broader crater,...
The modern surface of Mars does not sustain liquid water, however relict landforms observed on orbital images provide strong evidence past aqueous activity. Nevertheless on-the-ground analysis sedimentary strata are required to robustly characterise the specific nature early palaeoenvironments. 2020 Perseverance rover is exploring a prominent fan deposit at western margin Jezero crater – Western which has been interpreted be an river delta that prograded into ancient lake basin...
The Perseverance rover has completed three scientific campaigns in Jezero crater, Mars, encompassing the following regions: 1) Crater Floor, 2) Fan Front, and 3) Upper Fan. During that time, mission collected 21 samples, traversed km of distance, deposited 10 samples at Three Forks location near base Front. Perseverance's progress been enabled by efficiencies Mars 2020 operational processes both strategic tactical levels. Strategic planning is an especially important process given role...
The modern surface of Mars does not sustain liquid water, however relict landforms observed on orbital images provide strong evidence past aqueous activity. Nevertheless on-the-ground analysis sedimentary strata are required to robustly characterise the specific nature early palaeoenvironments. 2020 Perseverance rover is exploring a prominent fan deposit at western margin Jezero crater – Western which has been interpreted be an river delta that prograded into ancient lake basin...
Earth and Space Science Open Archive This work was has been accepted for publication in Journal of Geophysical Research - Planets. Version RecordESSOAr is a venue early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing an older version [v1]Go to new versionWhere Mars' Hypothesized Ocean Shorelines? Large Lateral Topographic Offsets Between Different Versions Paleoshoreline Maps.Authors Steven F Sholes iD...