A Radar Image of Venus . ... NAIC , NRAO , NASA , NSF Explanation: The largest radio telescopes in the world are working together to create a new map of the surface of Venus. ... The new survey will resolve details as fine a one-kilometer across, and will be inspected for changes since the last major radar map was made by NASA's Magellan spacecraft that orbited Venus from 1990 to 1994. Pictured above is part of a preliminary image showing details as small as five-kilometers across. ...