Category: Meteorites & Asteroids
![a) Mn/Na vs. Mn/Mg and b) Mn/Na vs. K/Li ratios among planetary bodies. The coloured curves denote the evolution of the composition of an evaporation residue calculated using eq. 35 at 1100 K (purple), 1500 K (blue), 2000 K (green) and 2500 K (red) at a fixed relative oxygen fugacity (∆IW-1, except for 1100 K, which was calculated at ∆IW-6, see text), with numbers denoting the fraction of Mn loss undergone by the body. The black dashed lines connect equal degrees of Mn loss at different temperatures. The solid black curves trace a binary mixture of a volatile-depleted end-member with 90 % Mn loss and a CI-like end-member. The small numbers denote the mass fraction of CI in the mixture. On a), only the volatile-depleted end-member at 1500 K is shown due to clarity, whereas in b) the end-members are taken at the three temperatures, and the dotted grey lines connect equal fractions of CI material. The grey point gives the composition of the Earth assuming 50 % of its Mn budget resides in the core [see Siebert et al., 2018]. The grey field denotes the compositional range of chondrites [Wasson and Kallemeyn, 1988; Siebert et al., 2018]. -- astro-ph.EP](https://astrobiology.newspackstaging.com/wp-content/uploads/2025/12/Physicochemical-Controls-On-The.png)
Posted inAstrochemistry, Astrogeology, Biochemistry & Organic Chemistry, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Comets and Asteroids, Genomics, Proteomics, Bioinformatics, Icy Worlds, Meteorites & Asteroids, Missions & Hardware, Origin & Evolution of Life, Planetary Protection & Biosafety, Robotics/Rovers/UAVs, Sample Return
Sugars And Stardust Found In NASA’s Asteroid Bennu Samples
Posted inAnalog Studies, Astrogeology, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Gaia - Planetary Perspectives, Icy Worlds, Imaging & Spectroscopy, Mapping, Geodesy, Cartography, Mars, Meteorites & Asteroids, Robotics/Rovers/UAVs, Water/Hycean Worlds & Oceanography
Findings Suggest The Mars Was Warmer And Wetter Millions Of Years Ago
Posted inAstrochemistry, Astrogeology, Biochemistry & Organic Chemistry, Biogeochemical Cycles & Geobiology, Biophysics, Biosignatures & Paleobiology, Comets and Asteroids, Icy Worlds, Imaging & Spectroscopy, Mapping, Geodesy, Cartography, Meteorites & Asteroids, Missions & Hardware, Robotics/Rovers/UAVs, Sample Return, Tricorders & Sensors
Prebiotic Organic Compounds In Samples Of Asteroid Bennu Indicate Heterogeneous Aqueous Alteration
Posted inAI - Data - Apps - Cybernetics, Atmospheres, Climate, Weather, Biochemistry & Organic Chemistry, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Fossils & Paleontology, Meteorites & Asteroids, Origin & Evolution of Life
