The biggest volcano in the Solar System could once have been an island in a vast sea, new research has found.
Olympus Mons is, however you measure it, a beast. The shield volcano stands approximately 25 kilometers high, and sprawls across an area roughly the, but the tallest planetary mountain known in the Solar System.
But there's something odd about its foot. It doesn't meet the ground as a clean slope. Rather, at a height of about 6 kilometers, for large portions of its circumference, it turns into a pronounced cliff, or escarpment, that drops off sharply to the surrounding landscape below. The origin of this feature is something of a mystery.
Mars is very dry and dusty nowadays. Any surface water is in the form of ice; no rivers flow, no oceans fill its vast basins and craters. But evidence
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