DAVID HARDY / SCIENCE PHOTO LIBRARY DAVID HARDY / SCIENCE PHOTO LIBRARY
Illustration of volcanos in the Tharsis region of Mars, as seen from orbit. At the far left is Olympus Mons, the largest volcano in the Solar System (27km high and 600km across the base). Just below centre is the line of the three Tharsis Montes (top to bottom): Ascraeus Mons, Pavonis Mons and Arsia Mons. At far right is the smaller Tharsis Tholus, with Ceraunius Tholus and the tiny Uranius Tholus just above and to the left. To the left of Pavonis Mons are the twin Paterae, Biblis (left) and Ulysses. The lines above the Tharsis Montes are the deep ravines of Tantalus Fossae, below is the highly-faulted structure of the canyon Noctis Labyrinthus.
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