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Olympus Mons
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Olympus Mons is a large shield volcano on Mars. As measured by the Mars Orbiter Laser Altimeter (MOLA), it is 21.1 kilometres (69,000 ft) or, more precisely, 21.287 kilometres (69,840 ft) high, about 2.5 times the elevation of Mount Everest above sea level. It is Mars's tallest volcano, its tallest planetary mountain, …