The largest volcano on Mars may sit above a 1,000-mile magma pool. Could Olympus Mons erupt again?

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A low-density, weak-gravity region has been found below Olympus Mons and the Tharsis volcanoes, while Mars' northern hemisphere is littered with puzzling high-gravity structures beneath the surface.

The largest volcano on Mars may sit above a 1,000-mile magma pool. Could Olympus Mons erupt again? : Read more