Olympus Mons on October 19, 1998, image by the Mars Global Surveyor.

Original caption:

Olympus Mons on Mars is the largest volcano in the Solar System. Although three times higher than Earth's Mount Everest, Olympus Mons would not be difficult to climb because of the volcano's great breadth. Covering an area greater than the entire Hawaiian volcano chain, the slopes of Olympus Mons typically rise only a few degrees at a time. The low gravity of Mars combined with a relatively static surface crust allow volcanoes this large to build up over time. This representative-color image was taken last April by the Mars Global Surveyor spacecraft currently orbiting Mars.

• http://antwrp.gsfc.nasa.gov/apod/ap981019.html

It the size of Ohio, United States

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