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Olympus Mons,
our solar system's largest volcano
Mars with Olympus Mons, as seen by the Hubble Space Telescope

Image: NASA, J. Bell (Cornell U.) and M. Wolff (SSI)

This Hubble Space Telescope image of Mars shows the largest volcano in the solar system, Olympus Mons. The giant extinct volcano is the irregular circular feature just above the center of the image. Olympus Mons is the size of Arizona and is three times higher than Mount Everest.