Overview
- The peer-reviewed paper published Nov. 5, 2026, reports that Haloferax volcanii reproduced over 160–180 days in laboratory conditions combining low pressure, very high salinity and a carbon‑dioxide–rich, oxygen‑free atmosphere.
- Growth occurred only when cultures were given nitrate or perchlorate—chemicals known on Mars—while identical treatments without those electron acceptors showed no measurable reproduction.
- Researchers observed dense biofilms in the low‑pressure, high‑salt cultures and measured minimal water loss, suggesting biofilms helped retain liquid in the experiments.
- The team stresses major caveats: experiments were run at warm laboratory temperatures (~21°C), used nutrient‑rich media, and modeled liquid brines that have not been confirmed on Mars, so the results do not prove life exists there today.
- Authors are now running follow-up tests at lower pressures and colder temperatures and say the results could change mission planning, biosignature priorities and planetary‑protection rules for future subsurface searches.