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Science 30 November 2001:
Vol. 294. no. 5548, pp. 1843 - 1844
DOI: 10.1126/science.1067541
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Perspectives

PLANETARY SCIENCE:
Clues to the Martian Atmosphere

Donald M. Hunten

Some 30 years ago, it was discovered that the main constituent of the thin martian atmosphere is carbon dioxide (CO2) but that it only contained trace amounts of carbon monoxide and molecular oxygen, the photodissociation products of CO2. Chemical reaction cycles involving water and hydrogen species have been developed to explain these observations, but as Hunten explains in his Perspective, observational evidence has been slow to emerge. He highlights the importance of Krasnopolsky and Feldman's discovery of molecular hydrogen in the martian atmosphere.

The author is at the Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA. E-mail: dhunten{at}lpl.arizona.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)