Caves, Craters, Mountains & Lava Tubes – Page 29 – My WordPress Site

Caves, Craters, Mountains & Lava Tubes, Extremeophiles and Extreme Environments

ESA's CAVES: Searching for Life in Strange Places

by Keith CowingJanuary 14, 2014August 23, 2022

Caves, Craters, Mountains & Lava Tubes, Extremeophiles and Extreme Environments

A Living Desert Underground

by Keith CowingDecember 3, 2013August 23, 2022

Dissimilarity analysis of evenness curves of amino acid assemblages. (a): Multidimensional Scaling (MDS) projection of dissimilarities between evenness curves, E(q). Points represent samples; distances between samples grow with dissimilarity. Edges connect samples to the 25th percentile of their nearest neighbors. Markers indicate inferred origin: biotic (green hexagons), abiotic (pink circles), and mixed (blue diamonds). (b): Evenness curve distributions of four distinct sample groups. Solid lines represent mean values, and filled areas represent the one standard deviation interval. (c): Predictive power of a sample’s origin through k-Nearest-Neighbors (kNN) classification, applied to pairwise distances between samples projected onto two MDS axes. Accuracy is quantified using a normalized Matthews Correlation Coefficient (MCC), where 50% corresponds to random assignment and 100% indicates perfect classification. Uncertainty was estimated using multiple initializations of the MDS projection. -- astro-ph.EP

Artemis & Lunar Exploration, Astrochemistry, Astrogeology, Biogeochemical Cycles & Geobiology, Caves, Craters, Mountains & Lava Tubes, Icy Worlds, Imaging & Spectroscopy, Mapping, Geodesy, Cartography, Missions & Hardware, Moon

NASA Lunar Reconnaissance Orbiter Reveals Ice Content in Shackleton Crater on the Moon

by Keith CowingJune 20, 2012June 13, 2024

Analog Studies, Arctic / Antarctic / Alpine, Away Teams & Field Reports, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Caves, Craters, Mountains & Lava Tubes, Cryobiology, Exploration Gear & Tech, Fossils & Paleontology, Icy Worlds, Imaging & Spectroscopy, Microbiology & Virology, Polar / Alpine Expeditions, Tricorders & Sensors

Kevin Hand’s Antarctic Journal 1 March 2005

by Keith CowingMarch 1, 2005January 31, 2024

Analog Studies, Arctic / Antarctic / Alpine, Away Teams & Field Reports, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Caves, Craters, Mountains & Lava Tubes, Exploration Gear & Tech, Extremeophiles and Extreme Environments, Fossils & Paleontology, Icy Worlds, Imaging & Spectroscopy, Mapping, Geodesy, Cartography, Microbiology & Virology, Polar / Alpine Expeditions, Tricorders & Sensors

Kevin Hand’s Antarctic Journal 8 February 2005

by Keith CowingFebruary 8, 2005January 31, 2024

Arctic / Antarctic / Alpine, Away Teams & Field Reports, Caves, Craters, Mountains & Lava Tubes, Exploration Gear & Tech, Mars, Missions & Hardware, Polar / Alpine Expeditions

Mountaineering And Climbing On Mars

by Keith CowingDecember 17, 2004December 17, 2023

Analog Studies, Arctic / Antarctic / Alpine, Astrogeology, Away Teams & Field Reports, Biosignatures & Paleobiology, Caves, Craters, Mountains & Lava Tubes, Exploration Gear & Tech, Icy Worlds, Mapping, Geodesy, Cartography, Meteorites & Asteroids, Missions & Hardware, Polar / Alpine Expeditions, Robotics/Rovers/UAVs

MARS-1 Humvee Rover Reaches Devon Island After Successful Crossing of Frozen Arctic Sea

by Keith CowingMay 20, 2003July 15, 2025

N-isotope fractionation values observed in this study compared to the sedimentary δ15N record a, and known ranges of extant microbial biomass b, The sedimentary database includes bulk rock δ15N (dark grey) and kerogen δ15N (light grey), from both marine and nonmarine rocks across a range of very low to moderate metamorphic grades22,39,40. The purple bar in a and b represents the average fractionation signature of all ancestors in this study and is largely coincident with the minimum d15N values seen in the rock record which are presumed to record nitrogen-fixation unaffected by subsequent nitrogen cycling. The partial range of bacterial and fractionation signatures are labeled as the modern range of N-isotopic values41 (see Figure S3 for extended range). -- biorxiv.org

Astrogeology, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Caves, Craters, Mountains & Lava Tubes, Habitable Zones, Imaging & Spectroscopy, Mapping, Geodesy, Cartography, Mars

New Images Suggest Present-Day Sources of Liquid Water on Mars

by Keith CowingJune 22, 2000April 13, 2024