Overview
- Published in the International Journal of Astrobiology, the study led by Penn State’s Corien Bakermans tested active Ramazzottius cf. varieornatus and Hypsibius exemplaris in two Curiosity-based regolith simulants, MGS-1 and OUCM-1.
- MGS-1 caused a rapid drop in activity within 48 hours, with many tardigrades inactive or dead, while OUCM-1 proved less harmful relative to Earth sand controls.
- Rinsing MGS-1 with water before exposure largely restored activity and survival to near-control levels, pointing to a water‑soluble damaging component.
- Researchers ruled out pH and salinity as sole explanations, observed mineral particles clustered near tardigrade mouths, and have not yet identified the specific agent.
- The findings frame a trade-off for Mars missions by hinting at a natural barrier to forward contamination while implying that regolith treatment would consume scarce water resources, and the tests did not include Martian pressure, radiation, or temperature stresses.