Olympus Mons on Mars Is So Large You Cannot See Its Peak from Its Base
A massive Martian volcano stretching beyond the curved horizon of the red planet, with a tiny human figure at the base for scale
Olympus Mons is the tallest volcano in the solar system at 21.9 kilometers high — nearly three times the height of Everest. Its base is so wide (600 km across) that the curvature of Mars hides the summit from anyone standing at the edge.
Why It’s Interesting
If you stood at its base, you would not know you were on a mountain. The slope is so gradual — about 5 degrees — that it would feel like standing on a gently tilted plain. Mars's lower gravity and lack of tectonic plates allowed it to grow to a size impossible on Earth.
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