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Friday, October 2, 2026 · UTC
Missions & Exploration

NASA loosens Mars planetary protection sterilization rules

The internal directive was issued 29 September 2026, and reverts allowed mission contamination risk to 1964 standards.

Caleb Mbeki
Planetary Science Reporter
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NASA eases Mars contamination rules amid tech advances
NASA eases Mars contamination rules amid tech advances AI illustrationhow this picture was made
NASA has loosened planetary protection sterilization requirements for Mars-bound spacecraft, per an internal directive issued 29 September 2026 by administrator Jared Isaacman.[1] The directive resets the maximum acceptable odds of biocontamination from an Earth mission to one in ten thousand, matching the original 1964 COSPAR standard for Mars.[4] Isaacman stated existing rules were drafted for an earlier era, noting advances in sterilization technology.[3] NASA will conduct a rapid modernization assessment of planetary protection science, with final recommendations due 1 December 2026.[2] On the same day the NASA directive was issued, the COSPAR Panel on Planetary Protection endorsed its own proposed update to Mars protection policy at its executive meeting.[5] The panel also reviewed ongoing work including an icy worlds planetary protection policy published earlier this year.[6]
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What this stands on
  1. On 2026-09-29, NASA Administrator Jared Isaacman issued an internal directive loosening planetary protection sterilization rules for Mars-bound spacecraft. · Scientific American
  2. NASA will conduct a rapid modernization assessment of planetary protection science, with recommendations due 2026-12-01. · Scientific American
  3. NASA Administrator Jared Isaacman stated existing planetary protection rules were designed for an earlier era, noting improved sterilization technology. · Scientific American
  4. The new NASA directive reverts allowed Mars mission biocontamination odds to the 1964 COSPAR standard of one-in-ten-thousand. · Scientific American
  5. On 29 September 2026, the COSPAR Panel on Planetary Protection endorsed a proposed update to the Mars planetary protection policy at its executive meeting. · Astrobiology
  6. At the same 29 September 2026 meeting, the COSPAR Panel on Planetary Protection welcomed new members and reviewed ongoing activities including an icy worlds planetary protection policy published earlier 2026. · Astrobiology
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