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Science 2 June 2006:
Vol. 312. no. 5778, pp. 1319 - 1320
DOI: 10.1126/science.1128497
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Perspectives

PLANETARY SCIENCE:
Exploring Other Worlds to Learn More About Our Own

Ingo C. F. Müller-Wodarg

Simultaneous observations of the drag of satellites through the upper atmospheres of Mars and Earth reveal how carbon dioxide is differentially cooling their upper atmospheres.

The author is in the Space and Atmospheric Physics Group, Imperial College London, London SW7 2BW, UK. E-mail: i.mueller-wodarg{at}imperial.ac.uk

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