Results 61 to 70 of about 6,115 (251)
Frontiers in Microbiology, 2012 Geochemical, molecular, and physiological analyses of microbial isolates were combined to study the geomicrobiology of acidic iron oxide mats in Yellowstone National Park (YNP).
Mark A Kozubal +8 more
doaj +1 more source
Earth and Space Science, Volume 12, Issue 5, May 2025.Abstract The potential of multi‐spectral investigations for planetary exploration strongly depends on the specific geologic environment and related science questions. In this work, we used a visible‐near infrared spectrometer, a laser‐induced breakdown spectroscopy (LIBS) instrument, and a Raman spectrometer for studying acid alteration of volcanic ...
K. Stephan +9 more
wiley +1 more source
International Journal of Geophysics, 2016 Over the last two decades, conspicuously “biogenic-looking” corrosion microtextures have been found to occur globally within volcanic glass of the in situ oceanic crust, ophiolites, and greenstone belts dating back to ~3.5 Ga.
Jason E. French, David F. Blake
doaj +1 more source
The Link Between Subsurface Rheology and Ejecta Mobility: The Case of Small New Impacts on Mars
Journal of Geophysical Research: Planets, Volume 130, Issue 5, May 2025.Abstract The dynamics of crater ejecta are sensitive to the material properties of the target, much like the crater size and morphology. We isolate and quantify the effect of target properties on the ejecta mobility (EM) ‐ the maximum radial extent of ejecta scaled by the crater radius.
A. J. Sokolowska +3 more
wiley +1 more source
Journal of Geophysical Research: Planets, Volume 130, Issue 5, May 2025.Abstract This work presents geomorphological analyses of an area at the boundary between Arcadia Planitia and northern Amazonis Planitia, situated in the northern mid‐latitudes of Mars. Recent studies have indicated the presence of substantial volumes of near‐surface excess ice in Arcadia Planitia, making this region a promising candidate for future ...
Erica Luzzi +5 more
wiley +1 more source
Publications of the exobiology program for 1979: A special bibliography [PDF]
A list of 1973 publications resulting from research pursued in exobiology is presented.
Devincenzi, D. L., Pleasant, L. G.
core +1 more source
Origins and Alteration of Ediacaran Carbonates Recording the Shuram Excursion in Oman
Geochemistry, Geophysics, Geosystems, Volume 26, Issue 5, May 2025.Abstract The Shuram excursion is the largest known negative carbon isotope excursion in Earth's history. Recognized globally, it follows the Ediacaran Gaskiers glaciation and precedes a marked increase in the diversity and complexity of the earliest macroscopic multicellular organisms in the fossil record.
Kristin D. Bergmann +7 more
wiley +1 more source
Exobiology issues and experiments at a Mars base [PDF]
Research in Exobiology, the study of the origin, evolution, and distribution of life in the universe, may be a major component of the science activities at a Mars Base.
Mckay, Christopher P.
core +1 more source
Geophysical Research Letters, Volume 52, Issue 8, 28 April 2025.Abstract Previous studies reported megadroughts in southwestern North America during the Medieval Climate Anomaly and subsequent periods. However, previous local records challenge traditional tree‐ring based indices. Through mineralogical analyses of Deep Springs Lake sediments in California, we examined carbonate mineral assemblages as novel ...
Jianru Cheng, Huifang Xu
wiley +1 more source
The 1st Symposium on Chemical Evolution and the Origin and Evolution of Life [PDF]
This symposium provided an opportunity for all NASA Exobiology principal investigators to present their most recent research in a scientific meeting forum.
Devincenzi, D. L., Pleasant, L. G.
core +1 more source