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Remote sensing for organics on Mars.

W L Davis1, C P McKay, S F Hynes

  • 1SETI Institute, NASA Ames Research Center, Moffett Field, CA 94035, USA.

Advances in Space Research : the Official Journal of the Committee on Space Research (COSPAR)
|September 7, 2001
PubMed
Summary

Detecting Martian organics is key. Algae in Martian soil (palagonite) show a spectral signature above 6% dry mass, likely from chlorophyll a, aiding Mars life detection.

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Area of Science:

  • Astrobiology
  • Planetary Science
  • Spectroscopy

Background:

  • Detecting organic molecules on Mars is a primary objective for astrobiology.
  • Understanding the detection limits of organic compounds in simulated Martian environments is crucial for mission planning.
  • Recent advancements in analytical techniques enhance the capability for low-level organic detection.

Purpose of the Study:

  • To investigate the lower detection limits of complex organics in a simulated Martian regolith.
  • To identify spectral features indicative of biological material in a palagonite matrix.
  • To assess the feasibility of detecting specific organic pigments, like chlorophyll a, on Mars.

Main Methods:

  • Utilizing advanced instrumentation for spectral reflectance measurements.
  • Preparing samples with varying dry mass weight ratios of algae to palagonite.
  • Analyzing spectral data in the visible range to identify characteristic absorption or emission features.

Main Results:

  • A distinct spectral reflectance feature was observed in the visible range for dry mass ratios of algae to palagonite exceeding 6%.
  • This threshold corresponds to approximately 30 mg of algae within a 470 mg optically thick palagonite layer (less than 3 mm).
  • The observed spectral signature is strongly indicative of chlorophyll a, a common photosynthetic pigment.

Conclusions:

  • Algae, specifically chlorophyll a, can be detected in a palagonite medium under specific concentration thresholds using spectral reflectance.
  • This finding has significant implications for the search for biosignatures on Mars.
  • The study demonstrates the potential for remote sensing techniques to identify key organic molecules relevant to life.
Keywords:
NASA Center ARCNASA Discipline Exobiology

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