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.
JPL / NASA
Volume 3, number 1
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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.
An asteroid or comet headed for Earth is the only large-scale natural disaster we can prevent. Working together to fund our Shoemaker NEO Grants for astronomers, we can help save the world.
Pretty pictures and