NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Troughs in the surface of Venus, imaged by the Magellan radar mapping spacecraft in September 1990. The area covered by this frame is in the Lavinia Planitia region in the southern hemisphere, and is 28km wide by 75km long. The troughs are bounded by faults, probably from expansive tectonic movement of the surface. The line of pits extending west (left) just above centre suggests some volcanic activity under the surface, consistent with tectonic motion.
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