NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Colour-coded topographic map of the surface of Venus, compiled from radar data recorded by the Pioneer-Venus spacecraft. The smooth circle at top marks the south pole, an area not mapped by the spacecraft. Most of the planet's surface is covered by relatively smooth plains, coloured blue in this image. The equatorial highland region, coloured green and yellow, is a large "continent" known as Aphrodite Terra.
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