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Is Olympus Mons still active? The honest answer is: we don't know for certain. Mars has no seismic monitoring network capable of confirming current volcanic activity. But geological evidence suggests it is currently dormant — not extinct. The last eruptions may have occurred as recently as 25 million years ago — which in geological terms is the recent past. Today, Olympus Mons sits silent. A three-billion-year-old monument to what happens when a planet builds a volcano without interruption. Its