Mars geological studies reveal ancient wetting cycles and new gully formation theories

New geological findings from Mars are reshaping the understanding of the planet's environmental history. Observations from the Curiosity rover in the Gale Crater have identified a network of hexagonal mud cracks. These structures, located in the Pontours area, suggest a history of repeated wetting and drying cycles. While the cracks indicate an environment that underwent significant changes, researchers note that the geometry alone does not confirm the specific origin of the water, and the estimated age of 3.8 billion years requires further precise dating.

In a separate analysis of Martian gullies, particularly near the Sisyphi Cave region by the Martian south pole, researchers have challenged previous theories regarding their formation. Using data from the Mars Express and Mars Reconnaissance Orbiter, a team of astrophysicists concluded that liquid water is unlikely to be the cause of these trenches. Furthermore, the study suggests that CO2 geysers may not be responsible either. Instead, the data points toward CO2-ice-driven fluidization or avalanche processes occurring during the late stages of seasonal ice sublimation.