US GEOLOGICAL SURVEY / SCIENCE PHOTO LIBRARY US GEOLOGICAL SURVEY / SCIENCE PHOTO LIBRARY
Mars. Oblique view of the giant Valles Marineris canyon system (left foreground) & the three Tharsis volcanos, computer-processed from Viking spacecraft imagery & topographic maps of the planet. The Valles Marineris is over 3000 km long & up to 8 km deep, dwarfing the Grand Canyon of Arizona. The canyons were formed by a combination of geological faulting, landslides, & erosion by wind & water. The volcanos are, from left to right, Arsia Mons, Pavonis Mons, & Ascraeus Mons. The view is looking east.
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