DC
AGU Research
Search
Filters
Clear All
Excluding Waterworld O2 Biosignature False Positives via Land Detection with HWO
AGU 2024
planetary sciences | 13 december 2024
Anna Grace Ulses, Joshua Krissansen-Totton, Tyler ...
Biosignature searches with the Habitable Worlds Observatory (HWO) will require an understanding of how biosignature false positives that is non-biolo...
View Abstract
Probable Concretions Observed in the Shenandoah Formation of Jezero Crater, Mars and Comparison With Terrestrial Analogs
JOURNAL OF GEOPHYSICAL RESEARCH: PLANETS
19 august 2024
Hemani Kalucha, Adrian P. Broz, Nicolas Randazzo, ...
The Mars 2020 Perseverance Rover imaged diagenetic textural features in four separate sedimentary units in its exploration of the 25‐m‐...
Supercooling, Equilibrium and Kinetic Products of Enceladus-relevant Salt Solutions
ENCELADUS: FROM INNER WORKINGS TO THE POTENTIAL FOR LIFE II POSTER
planetary sciences | 14 december 2023
Fabian Klenner, Ardith Bravenec, Lucas Fifer, Bapt...
There are multiple lines of evidence for the existence of crystalline as well as glassy water ice on Saturns moon Enceladus, from both spacecraft obse...
View Abstract
Oxidation in ~1.4 Ga Iron-type fossil micrometeorites as a probe of coeval atmospheric composition
EVOLUTION OF TERRESTRIAL PLANETARY ATMOSPHERES: NOVEL TECHNIQUES AND NEW CONSTRAINTS WITH IMPLICATIONS FOR THE EARTH AND BEYOND POSTER
planetary sciences | 12 december 2023
Danqiu Chen, Roger Buick, Donald E. Brownlee, Jade...
Micrometeorites are relatively abundant on Earth because of continuous accumulation. During atmospheric entry at hypervelocity, micrometeorites can me...
View Abstract
A new, climatic hypothesis for evolutionary stasis in the “boring billion”: Animals don’t like it hot
EVOLUTION OF TERRESTRIAL PLANETARY ATMOSPHERES: NOVEL TECHNIQUES AND NEW CONSTRAINTS WITH IMPLICATIONS FOR THE EARTH AND BEYOND POSTER
planetary sciences | 12 december 2023
David C. Catling, Nicholas Wogan, Kevin J. Zahnle
The interval ~1.8-0.8 Ga is called the boring billion (BB) because of relative stasis in geochemical signatures and a distinction from subsequent dram...
View Abstract
Xenon Escape and the Properties of Earth's Archean Atmosphere
EXPLORING ARCHEAN EARTH TO UNDERSTAND ARCHEAN-LIKE EXOPLANETS POSTER
planetary sciences | 11 december 2023
Kevin J. Zahnle, David C. Catling, Marko Gacesa
Earth's atmospheric xenon is strongly mass fractionated, the result of a process that apparently began in the Hadean, continued through the Archean, a...
View Abstract
Origin of Life Molecules in the Atmosphere After Big Impacts on the Early Earth
EXPLORING THE INTERSECTION OF EARLY EARTH ENVIRONMENTS, PREBIOTIC CHEMISTRY, AND LIFE’S EMERGENCE I ORAL
planetary sciences | 11 december 2023
Nicholas Wogan, David C. Catling, Kevin J. Zahnle,...
While there are several theories for the origin of life, the presence of ribonucleic molecular fossils in modern biology has led to the RNA World hypo...
View Abstract
Stratospheric Gas‐Phase Production Alone Cannot Explain Observations of Atmospheric Perchlorate on Earth
GEOPHYSICAL RESEARCH LETTERS
03 may 2023
Yuk Chun Chan, Lyatt Jaegle, Pedro Campuzano Jost,...
Perchlorate has been observed in many environments on Earth and Mars but its sources remain poorly quantified. In this study, we use a global three...