The largest volcano in the Solar System

This view looks vertically down into the complex caldera at the summit of Olympus Mons on Mars, the highest volcano in our Solar System. Olympus Mons has an average elevation of 22 km and the caldera has a depth of about 3 km. This was the first high-resolution colour image of the complete caldera of Olympus Mons, taken by ESA’s Mars Express on 21 January 2004.

• Source: European Space Agency (Flickr)