The upcoming Rosalind Franklin rover mission to Mars in 2028 is set to be a groundbreaking endeavor, with a focus on searching for signs of microbial life in a region rich in clay deposits. This mission, part of the ExoMars project, aims to explore Oxia Planum, a site that has revealed even more extensive clay deposits than previously thought, stretching over 373 miles and rising over 0.6 miles in altitude. These clays, dating back approximately 4 billion years, are believed to have formed in an ancient Martian ocean, providing a promising environment for preserving traces of past life.
The new study, published in the journal Icarus, highlights the vastness of the clay deposits and their potential significance. Lead author Inés Torres Auré from the University of Lyon emphasizes the importance of this discovery, stating that the clays in Oxia Planum are the oldest on Mars, predating those in Mawrth Vallis. This timeline suggests that the clays in Oxia Planum might have the best chances of preserving ancient life, if it ever existed.
The abundance of clays in the region indicates a significant amount of water in Oxia Planum in the distant past. This finding supports the growing evidence of an ancient Mars ocean, as suggested by Jorge Vago, ExoMars project scientist. The vastness of the clay deposits and their age imply a regional or global process requiring immense amounts of water, further strengthening the case for a water-rich Mars.
However, the formation of clays in groundwater that once flooded the region is also a possibility. The Rosalind Franklin rover will play a crucial role in determining the ground truth by comparing its findings with those of spacecraft in orbit around Mars. Elliot Sefton-Nash, ExoMars deputy project scientist, highlights the rover's ability to provide deeper insights into Mars' early history and the ancient environment in which the clays formed.
The study also documents environmental change over time, revealing a pause in deposition and a shift in water chemistry and mineralogy. This finding supports the idea of an intermittently wet climate on Mars, which is exciting for the search for past life. The rockfalls and ancient floods could have brought organic materials close to the landing site, making it easier for the rover to sample them.
The naming of the rover after Rosalind Franklin, a renowned scientist who helped reveal the structure of DNA, is fitting for this mission. Her legacy as a great seeker of scientific mysteries aligns with the rover's goal of exploring the mysteries of Mars and searching for life. The Rosalind Franklin rover mission is poised to make significant contributions to our understanding of Mars and its potential for past or present life.
