Contents

06 July 1979
Vol 205, Issue 4401

About The Cover

Artist's view of Venus based on ideas of some scientists in the first half of the 20th century. Competing theories pictured Venus as a hot, lifeless desert or as a cool, moist, habitable planet. High mountains, swamps, vast oceans, and dense water clouds were postulated. Venus was widely thought to be similar in development to Earth in the Paleozoic era. See page 41. [Painting by Ron Miller, Woodbridge, Virginia]