Mars research explores organic molecule stability and salt-based microbial habitats

New research explores how Martian environmental conditions and minerals might influence the preservation and survival of organic molecules and potential microbial life.

A study published in Icarus examined the stability of uracil, a nucleobase, when exposed to Martian-like ultraviolet (UV) radiation in the presence of various sulphates. The findings indicate that while sulphates like FeSO4 and CaSO4 exhibit photocatalytic effects that can promote degradation, the half-lives of uracil in these environments remain long enough—exceeding 30 hours—to allow for detection by rover instruments. The study suggests that the formation of uracil dimers may provide a degree of photoprotection.

Complementary research from ELTE Eötvös Loránd University and the Konkoly Observatory suggests that salt crystals could serve as miniature greenhouses for Martian microbes. Due to the extreme temperature fluctuations on Mars, salt crystals like halite undergo mechanical stress, potentially creating microscopic crevices. These crevices may allow life to access both liquid water and reasonable temperatures simultaneously by utilizing the process of deliquescence, where salts absorb moisture from the air during the Martian night.