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Venus radar map, centred on the Venusian North Pole. The map is colour-coded for altitude, going from low altitude (purple) through blue, green, yellow and orange to high altitude (red). The scale is at lower right. Most of this map was created using radar data gathered by the Magellan spacecraft from 1990 to 1994. Gaps in the coverage were filled in using data from earlier missions and Earth-based radar telescopes. This map is part of a set of six radar maps of Venus: see images R334/184 to R344/189. (KEYSTONE/SCIENCE PHOTO LIBRARY/NASA/JPL/USGS/SCIENCE PHOTO LIBRARY)