Viking experiments on Mars

Details Viking experiments on Mars Viking experiments on Mars

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mesrm..74..261r&link_type=abstract

Memoires Scientifiques de la Revue de Metallurgie, vol. 74, Apr. 1977, p. 261-263. In French.

Astronomy and Astrophysics

Astronomy

Mars Atmosphere, Mars Surface, Viking Mars Program, Annual Variations, Astronomical Models, Chemical Reactions, Extraterrestrial Life, Limonite, Mars Environment, Polar Caps, Siderites

Scientific paper

It is hypothesized that the reversible conversion of yellow siderite to red-brown limonite and of limonite to a greenish blend of lepidocrocite and goethite occurs on a large scale on the surface of Mars. As the direction in which these reactions proceed is temperature-dependent, this hypothesis would explain observed seasonal variations in the color of Mars. The cycle of hydration and dehydration reactions is consistent with observed changes in the polar caps of the planet. The hypothesis also provides an explanation for positive results in Viking experiments to detect the presence of life.

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