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Olympus Mons on Mars
Photo: Mars' Olympus Mons volcano
WALLPAPER
Looming larger than any volcanic mountain in the solar system, Olympus Mons on Mars is taller than three Mount Everests and is about as wide as the entire Hawaiian Islands chain. There's no dramatic summit, though—it's nearly as flat as a pancake.
Photograph courtesy NASA/JPL/Malin Space Science Systems

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