[Arctic, Antarctic, and Alpine Research] Lake Joyce of the McMurdo Dry Valleys (MDV), Antarctica, contains an endemic copepod population (Diacyclops joycei) that has not been identified from apparently suitable habitats […]
Biogeochemical Cycles & Geobiology
Posted inAstrogeology
Diverging Mineral Chemistry of Iron and Nickel Throughout Earth’s Changing Redox Conditions Reveals Foundation for Their Evolution as Protein Cofactors
[LIFE] Iron (Fe) and nickel (Ni) were both foundational to early metabolism, yet their biological trajectories diverged as Earth’s surface redox state changed. Here, we integrate mineral chemistry network analysis, […]
![Deep-sea microbial sample processing. Detailed sample processing steps for HPG assimilating cells and total cell counts are denoted in grey and black arrows/squares, respectively. Processing steps and samples used for metagenomic sequencing are denoted in light-blue arrows and squares. “Whole sample” correspond to triplicate 50 ml aliquots, each filtered onto a 0.22 μm filter directly from the cryopreserved material, and then released with 200 μl of 0.025% (v/v) Tween 20 in PBS to be processed through MDA and DNA sequencing; “all cells” correspond to samples of cryopreserved material that were stained with a DNA dye, collected on a 0.22 μm filter, processed through the BONCAT labelling assay, and then sorted by flow cytometry, aiming to select events that presented the DNA dye; “BONCAT+” cell samples originated from the same material as ‘all cells’, but their sorting aimed for events that presented both the DNA dye and the fluorescent dye Alexa-Fluor 488 (attached to the HPG incorporated by the active cells). The selection of BONCAT+ cells was established for each sample based on the level of BONCAT background labelling to the microbial community when not exposed to HPG, or when fixed before being exposed to HPG (i.e. reflecting the adhesion of the fluorescent label to cells that did not incorporate HPG). -- [ISME Journal via PubMed]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/Sample-Return.png?resize=1200%2C719&ssl=1)
Posted inSample Return
Sample Return: Minimizing Decompression And Warming During Deep Seawater Collection Increases Abundance And Activity Of Autochthonous Bacteria And Archaea
[ISME Journal via PubMed] The deep ocean hosts autochthonous pressure-adapted microorganisms that are unique to this environment, as well as allochthonous pressure-sensitive members transported from shallow depths by vertical advection […]
![Potential environments for the origin of life and the corresponding roles of minerals. (a) In the deep-sea hydrothermal vent hypothesis, metal sulfides play a critical role in the formation of chemical precursors and building blocks. (b) In terrestrial hot spring, minerals may concentrate and stabilize molecular building blocks, catalyze polymerization under wet–dry cycling conditions, and provide protection against environmental stresses. (c) Extraterrestrial input of organic matter through meteorites, comets and IDPs. Minerals are the carrier and preserver of organic compounds and may possibly take part in the prebiotic synthesis of organic compounds in extraterrestrial environments. (Background images are modified based on AI-generated illustrations.) -- [Fundamental Research]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/The-role-of-minerals.png?resize=1200%2C717&ssl=1)
Posted inOrigin & Evolution of Life
The Role Of Minerals In Prebiotic Evolution: Implications For Identifying Worlds With The Potential For Life’s Origin
[Fundamental Research] Understanding the origin of life requires explaining how abiotic molecules transitioned into the first living systems within plausible geological settings. Increasing evidence suggests minerals as active participants in […]
Posted inTitan
Dragonfly Titan Astrobiology Droid Clears Key Tests
The mission reached a major milestone on June 29, when the Dragonfly team at the Johns Hopkins Applied Physics Laboratory (APL) in Laurel, Maryland, delivered the nearly 13-foot-long fuselage for […]
Posted inExtinction events
Researchers Confirm The Cause Of Earth’s Biggest Mass Extinction
[Stanford University] A new Stanford-led study offers the clearest picture yet of how some ocean life survived our planet’s biggest mass extinction while most animals did not.
Posted inAstrogeology
Ancient Rocks Reveal How Water Shaped Earth 3.1 Billion Years Ago
[Adelaide University] Geologists studying some of the planet’s oldest volcanic rocks have uncovered new evidence that water was playing a major role in shaping Earth’s interior and driving volcanic activity […]
Posted inMars
Water Ice Inside A Martian Crater
[ESA] Like a sprinkle of powdered sugar on a rich red velvet cake, this scene from the ESA/Roscosmos ExoMars Trace Gas Orbiter captures the contrasting colours of bright white water-ice […]
Posted inMars
Hematite Is A Mineralogical Marker Of Ancient Climate Change On Mars
[Science via PubMed] The ancient climate of Mars changed from warm to cold surface conditions. This climate transition is demonstrated by geomorphological evidence but lacks suitable mineralogical indicators.
Posted inAstronomy & Telescopes
The Habitable Worlds Observatory Technology Development Plan
[astro-ph.IM] The Habitable Worlds Observatory (HWO) is NASA’s next large space telescope, selected by the 2020 Decadal Survey in Astronomy and Astrophysics to search for and characterize habitable exoplanets while […]