Astrobiology48- Page

Regional context and geospatial distribution of potential karstic skylight features in Hebrus Valles, Mars. (a) Mars Orbiter Laser Altimeter (MOLA) global topography illustrating the location of Hebrus Valles relative to

The distribution of planets, main comet and asteroid belts around the Sun, and the equivalent analogues for Beta Pictoris and WD 1145+017. All distances are logarithmic, scaled such that they

Comparison between the analytical transmission models and the empirical spectra. Top: Earth’s transmission spectrum from Macdonald & Cowan (2019, 2023) derived from ACE-FTS solar-occultation measurements. The empirical spectrum is shown

Azimuthally averaged gas density (left) and gas radial velocity relative to the planet (right) for our FARGO3D disk model containing a Jupiter mass planet at 75 au. The CO sublimation

The host star properties in 𝑇SED − 𝑅★ space, along with their associated 68% confidence contours. For comparison we show a series of isochrones from Dotter et al. (2008) and

Neural networks help map ocean colour — ESA (larger image) Climate change is already reshaping global weather patterns and ecosystems around the world. In the long-term, its consequences could range

A panoramic aerial drone image of the Jinlin crater with the approximate location of the crater rim labeled, with an insert of the crater floor, which shows a mix of

Ice coverage in the Arctic sea is rapidly declining, which causes the remaining ice to melt faster and alters nutrient availability. In a University of Washington-led study, researchers show how

The “tree” here is the taxonomic tree of the organisms analysed, coloured by major group. The red bars on the outside of the tree show how many species have been

Biosignatures & Paleobiology Status Report eartharxiv.org November 12, 2025 Life processes and requirements resulting in the production of specific molecular structures that, if preserved, can function as biosignatures. B) OM