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Science 19 November 2004:
Vol. 306. no. 5700, pp. 1298 - 1299
DOI: 10.1126/science.1105669
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Perspectives

PLANETARY SCIENCE:
Alien Weather at the Poles of Mars

François Forget

Between autumn and winter on Mars, the main constituent of the martian atmosphere, CO2, condenses to form ice caps at both poles. In his Perspective, Forget discusses an analysis of the martian atmosphere by the Gamma Ray Spectrometer aboard Mars Odyssey, which reveals unexpected fluctuations in atmospheric composition that create weather with no equivalent on Earth.

The author is at the Laboratoire de Meteorologie Dynamique, Institut Pierre Simon Laplace, Universite Paris 6, Paris cedex 5, France. E-mail: francois.forget{at}lmd.jussieu.fr

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