How this page evolved

Every published version is kept. Each entry shows what changed and why. Earlier versions can be restored by moderators, but only if the material they rely on is still available.

1. Revision 3Oct 4, 2026, 8:49 AMLiveAI-organised, reviewed

   Added newly available evidence on Mars sample return (biological risk assessment and the Tianwen-3 biosignature strategy), on the chemistry of habitable water reservoirs including early Mars, and on Perseverance's nickel-rich Neretva Vallis findings; folded these into the finding, sections, takeaways, guidance, uncertainty and open questions while keeping the existing biosignature, Viking and subsurface material.

   • · The main finding was rewritten.
   • · Updated “What would count as evidence of life”.
   • · Updated “Where biosignatures are most likely to survive”.
   • · Added section “Bringing samples back”.
   • · 4 new sources cited.
   • · The note on uncertainty changed.
   • · The key takeaways were revised.
   • · 2 new pieces of guidance for specific situations.
   • · 2 new open questions.
2. Revision 2Oct 3, 2026, 6:16 PMAI-organised, reviewed

   AI-prepared Starting Map from live research.

   • · First published version.