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Related Experiment Videos

Life on Mars? The Viking labeled release experiment.

G V Levin, P A Straat

    Bio Systems
    |September 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Viking experiments on Mars showed potential life signs, but intense UV radiation and lack of organic matter leave the question of Martian microbes open.

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    Area of Science:

    • Astrobiology
    • Planetary Science
    • Microbiology

    Background:

    • Viking radiorespirometry experiments on Mars yielded results indicative of microbial activity.
    • Mars' harsh surface conditions, including intense UV flux, present alternative explanations for these findings.

    Purpose of the Study:

    • To evaluate the evidence for microbial life on Mars based on Viking LR experiments.
    • To investigate potential non-biological explanations for the observed radiorespirometry results.

    Main Methods:

    • Analysis of Viking labeled release (LR) experiments from two Martian sites.
    • Investigation of UV and gamma irradiation effects on terrestrial analogs.
    • Review of molecular analysis data for organic matter on Mars.

    Main Results:

    • LR experiments produced results that, on Earth, would confirm microbial activity.
    • UV irradiation of Mars Analog Soil did not replicate the LR results.
    • Gamma irradiation of silica gel yielded positive results, but did not mimic Martian findings.
    • Molecular analysis failed to detect significant organic matter, though limitations exist.

    Conclusions:

    • The presence of microbial life on Mars remains undetermined.
    • Oxidative compounds produced by UV radiation are a plausible alternative explanation for LR results.
    • Sensitivity limits of organic detection instruments could allow for undetected microbial presence.