Mars soil may defend against Earth microbes while enabling future farming

Space-biologist researchers exposed tardigrades to Mars-regolith simulants (MGS-1 and OUCM-1). In MGS-1, tardigrades entered dormancy within two days, suggesting a toxic component that could be washed away—washing improved tardigrade resilience and made regolith more hospitable for growth, while OUCM-1 remained inhibitory but less so. The work implies Mars’ soil may defend against Earth microbes, aiding planetary protection, and that washed regolith could potentially be turned into crop‑soil for future missions. The findings were published in December 2025 in the International Journal of Astrobiology.