Abstract
In the past four years, the first high resolution synoptic images of the surface of Venus have been obtained and we have learned more about the nature of its surface and atmosphere. The major accomplishments of the U.S.S.R. in Venus exploration have been observed with great interest by U. S. investigators, some of whom have begun joint research efforts with Soviet scientists. Venera 15 and 16 radar imaging experiments, and new data obtained at the Arecibo Observatory, have provided answers to some important questions. Conjectured volcanic features have been resolved into unmistakable calderas or distinct lava flow morphologies. The question of whether Venus, like the Earth, may have high erosion rates is answered, and from the observed number of presumed impact craters, it appears that resurfacing rates on Venus are much smaller than on Earth. No evidence of water or wind activity has been seen.
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