Mons Olympus
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| Coordinates | 18°39′N 226°12′E / 18.65°N 226.2°ECoordinates: 18°39′N 226°12′E / 18.65°N 226.2°E |
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| Dimensions | Tallest planetary mountain in the Solar System |
| Peak | 21,230 m (69,650 ft) above datum 26 km (85,000 ft) local relief 26 km (85,000 ft) above plains |
| Discoverer | Mariner 9 |
| Eponym | Latin – Mount Olympus |
Olympus Mons ( /əˌlɪmpəs ˈmɒnz, oʊ-, -ˈmɒns/;Latin for Mount Olympus) is a very large shield volcano on the planet Mars. By one measure, it has a height of nearly 22 km (13.6 mi or 72,000 ft). Olympus Mons stands about two and a half times as tall as Mount Everest's height above sea level. It is the tallest mountain of all planets and other rounded bodies in the Solar System, and is the second tallest mountain in the Solar System overall, after Rheasilvia on the Asteroid Vesta. It is the youngest of the large volcanoes on Mars, having formed during Mars's Hesperian Period. It is currently the largest volcano discovered in the Solar System and had been known to astronomers since the late 19th century as the albedo feature Nix Olympica (Latin for "Olympic Snow"). Its mountainous nature was suspected well before space probes confirmed its identity as a mountain.
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