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Astronomers using the Hubble telescope to track weather on Mars and how it might affect the Pathfinder landing site in Ares Vallis report that a large dust storm seen south of the site only 12 days earlier has dissipated. However, a new dust storm has appeared in the polar region, about 1,200 miles (2,000 kilometers) due north of the landing site.

The Hubble researchers conclude that Pathfinder landed during a period when large changes in the regional distributions of dust and clouds were taking place on Mars. The green cross on the bottom picture identifies the Pathfinder landing site.

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