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Close-up of Olympus Mons
Volcano Olympus Mons on Mars

Mars image: NASA/JPL-Caltech

This image of Olympus Mons was taken in 1978 from the Viking 1 Orbiter satellite. The giant extinct volcano is 374 miles (602 kilometers) wide, as large as Arizona. Its summit is about 16 miles (26 kilometers) above the surrounding plains.