On the Cover:
Surface variations on volcanic Io are exaggerated in this Voyager
false color image of Jupiter's volcanic satellite. By manipulating digital images returned by spacecraft, scientists can bring out details of planets and moons not always visible in a scene as the human eye would see it. This Voyager
image is a Mercator projection of part of Io's surface.
Alfred McEwen / USGS
Volume 4, number 1
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(Planetary Society members only)
3 Project Sentinel to Grow: Thomas R. McDonough presents the expanded plan for this Society project.
4 19th Century SETI: Keay Davidson summarizes the history of the search for life beyond Earth.
6 Imaging—Pixels, not Pictures: Alfred S. McEwen and Laurence A. Soderblom take a look at how the process of imaging has revolutionized our ideas about Jupiter's moon Io.
11 News & Reviews Amazing IRAS; space station.
12 World Watch VEGA; possible Soviet planetary missions.
14 Society Notes Mars Institute contest, the media and META, and The Case for Mars II.
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