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The Planetary Report • January/February 1983

Martian Rivers

On the Cover: Viking Orbiter images suggest that rivers may have once flowed on Mars. Erosive features such as scour marks and teardrop-shaped islands, seen in this section of the Kasei Vallis channel, indicate sculpting by liquid water. The impact crater at the bend of the channel is 25 km across.


4 The Ancient Rivers of Mars: David Pieri takes us on a tour of the signs of ancient rivers flowing across the surface of Mars in Viking Orbiter images.

9 Io's Volcanic Plumes: Alfred S. McEwen and Laurence A. Soderblom showcase the stunning plumes of Io observed by the Voyager spacecraft.


12 News & Reviews Volcanic eruptions; astronomy and creationism.

13 Washington Watch Effects of the 1982 election on the space committees in Congress.

14 Society Notes The Planetary Society goes international.

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Bill Nye and people
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