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Science 24 April 1998:
Vol. 280. no. 5363, pp. 570 - 572
DOI: 10.1126/science.280.5363.570
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Reports

Clouds of High Contrast on Uranus

Erich Karkoschka

Near-infrared images of Uranus taken with the Hubble Space Telescope in July and October 1997 revealed discrete clouds with contrasts exceeding 10 times the highest contrast observed before with other techniques. At visible wavelengths, these 10 clouds had lower contrasts than clouds seen by Voyager 2 in 1986. Uranus' rotational rates for southern latitudes were identical in 1986 and 1997. Clouds in northern latitudes rotate slightly more slowly than clouds in opposite southern latitudes.

Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721-0092, USA. E-mail: erich{at}pirl.lpl.arizona.edu

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