Facts about Mars's Olympus Mons
- 09
Olympus Mons rises so gradually that its slopes would appear nearly flat to an observer, with an average gradient of only 1 degree per 11 kilometers horizontally.
- 08
Olympus Mons's lava composition differs significantly from Earth volcanoes, consisting primarily of low-viscosity basaltic flows that allowed it to achieve such an enormous size over billions of years.
- 07
Olympus Mons lacks a prominent summit crater visible from space because its caldera collapsed inward rather than explosively, leaving only subtle topographic features at its peak.
- 06
Low-density lava flows from Olympus Mons spread across Mars's surface in thin sheets extending up to 1000 kilometers from the volcano's base, creating uniquely expansive geological formations.
- 05
Olympus Mons contains a nested caldera complex at its summit spanning roughly 80 kilometers across, formed by multiple volcanic collapse events over millions of years.
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Olympus Mons last erupted approximately 2 million years ago, making it geologically young compared to most Martian volcanoes and potentially still volcanically active today.
- 03
Olympus Mons's slopes are so gradual, averaging only 5 degrees, that standing on its base you would be unable to see its summit due to Mars's curvature.
- 02
The shield volcano's base spans approximately 624 kilometers in diameter, making it roughly the size of the state of Arizona.
- 01
At 21.9 kilometers tall, Olympus Mons is nearly 2.5 times higher than Mount Everest and the largest volcano in our solar system.