Event / publication / experimentBranchesSeptember 10, 2025

A potential biosignature on Mars (Cheyava Falls)

This page delivers no verdict; it presents claims and evidence with their sources. No theory in science is absolute. Method

For everyone

In 2024 NASA's Perseverance rover found a rock with "leopard spots" in an ancient river valley in Jezero Crater. A paper published in Nature in September 2025 reported that iron phosphate and sulphide minerals found with organic carbon are commonly associated with microbial activity on Earth. The authors called this a "potential biosignature" and noted that the same features could also form by non-living chemical processes. A definitive answer requires returning the sample to Earth.

For specialists

In organic-carbon-bearing mudstones of the Bright Angel formation, minerals probably vivianite (Fe₃(PO₄)₂·8H₂O) and greigite (Fe₃S₄) were found in ring structures suggesting that organic matter took part in post-depositional redox reactions. The paper argues that forming these features abiotically at low temperature is difficult but cannot be ruled out. The "Sapphire Canyon" sample is cached for Mars Sample Return, whose future is uncertain for budget reasons.

Claims

This rock in Jezero Crater contains mineral and organic patterns that may be associated with ancient microbial life.^[1]

Evidence

Supporting

Observation

Redox fronts formed jointly by organic carbon, iron phosphate and iron sulphide resemble traces left by microbial metabolism on Earth.^[1][2]

Challenging

Methodological critique

The same mineral assemblages can form without life under high temperature or particular chemical conditions; the authors could not exclude this possibility entirely.^[1][3]

Connections

Parent

Space exploration

The first origin of life (abiogenesis)The claimed biosignature on K2-18 b

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Sources

ArticleHurowitz, J. A. et al. (2025). Redox-driven mineral and organic associations in Jezero Crater, Mars. Nature 645, 332–340DOI 10.1038/s41586-025-09413-0 archive
Web (2025). NASA says Mars rover discovered potential biosignature last year. NASA Jet Propulsion Laboratoryjpl.nasa.gov archive
News (further reading) (2025). Mystery Martian minerals hint at the planet's complex geochemical past. Nature News & Viewsnature.com archive

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Cite this page

APA

Athena contributors. (2026). A potential biosignature on Mars (Cheyava Falls). Athena: The tree of human knowledge. Retrieved November 1, 2026, from https://latifkedi.github.io/athena/en/d/mars-yasam/

BibTeX

@misc{athena_mars_yasam,
  title        = {A potential biosignature on Mars (Cheyava Falls)},
  author       = {{Athena contributors}},
  year         = {2026},
  howpublished = {\url{https://latifkedi.github.io/athena/en/d/mars-yasam/}},
  note         = {Athena: The tree of human knowledge. Accessed: 2026-11-01}
}

Added: September 27, 2026 · Last changed: September 27, 2026 · Page history

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