Probing Venus’ mountains — Science News, February 12, 1972
Venus’ perpetually cloud-shrouded surface remains penetrable only by radio waves. A planetary radar group now reports results of an extended series of radar measurements of the topography of Venus that for the first time provides a view of surface height variations around the entire circumference of the planet.
Update
Those observations were taken by the Arecibo radio telescope in Puerto Rico, which was the most powerful radar system for mapping rocky bodies in outer space until its sudden collapse in December 2020 (SN: 12/19/20 & 1/2/21, p. 8). The observatory also revealed ancient lava flows on Venus and ice on Mercury
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