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No. 6: February 1979

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Unearthly Life On Mars

From the media standpoint -- and therefore that of most people -- the Viking Martian biological experiments were uncompromisingly negative. However, R. Lewis points out that this is simple not so. The labelled-release experiments on both landers produced positive results every time a nutrient was added to fresh Martian soil. (The nutrient was tagged with carbon-14, and radioactive carbon dioxide always evolved, suggesting biological metabolism.) Further, the soil samples, when sterilized by heat, gave uniformly negative results. On earth. such repeatable experiments would be considered strong evidence that life existed in the samples. The reason the Viking experiments were described as "negative" is that the other two life detection experiments produced negative or equivocal results. The gas chromatograph, for example, detected no organic molecules in the Martian soil; and it is difficult to conceive of life without organic molecules. At first, most scientists preferred to explain the ambiguous life-detection-experiment results in terms of strange extraterrestrial chemistry. Nevertheless, strange extraterrestrial life would explain the data equally well. Everyone should be aware that the Viking biology team still considers life on Mars as a real possibility.

(Lewis, Richard; "Yes. There Is Life on Mars," New Scientist, 80:106, 1978.)

Comment. Most research into the possibility of extraterrestrial life assume "life-as-we-know-it." For more information on the Viking experiments, read entry AME14 in our Catalog: The Moon and the Planets. Ordering information here.

From Science Frontiers #6, February 1979. 1979-2000 William R. Corliss

Science Frontiers Sourcebook Project Reviewed in:


  • "A sourcebook of unexplained phenomena is therefore a valuable addition to a collection of scientific literature. William R. Corliss has provided this in the past with his source books of scientific anomalies in several subjects, and now he has provided it for astronomy. He has done an excellent job of collecting and editing a large amount of material, taken in part from scientific journals and in part from scientific reporting in the popular or semi-scientific press." -- "The Mysterious Universe: A Handbook of Astronomical Anomalies", reviwed by Thomas Gold, Cornell University, in Icarus, vol.41, 1980

  • "An interesting, systematic presentation of unusual weather [..] This book is recommended for a general audience" --"Corliss, William R., Tornados, Dark Days, Anomalous Precipitation, and Related Weather Phenomena, Sourcebook Project, 1983.", revieweed in Choice, September 1983
  • "..the science is necessarily somewhat speculative, but Corliss's symthesis is based on reputable sources." -- "Corliss, William R. (Compiler). Lightning, Auroras, Nocturnal Lights, and Related Luminous Phenomena" reviwed by Joseph M. Moran, Univ. of Wisconsin in Science Books and Films, Sep/Oct 1983

  • "Before opening the book, I set certain standards that a volume which treads into dangerous grounds grounds like this must meet. The author scrupulously met, or even exceeded those standards. Each phenomenon is exhaustively documented, with references to scientific journals [..] and extensive quotations" -- "Book Review: The moon and planets: a catalog of astronomical anomalies", The Sourcebook Project, 1985., Corliss, W. R., Journal of the Royal Astronomical Society of Canada, Vol. 81, no. 1 (1987), p. 24., 02/1987