JPL / UNIVERSITY OF ARIZONA / NASA / SCIENCE PHOTO LIBRARY JPL / UNIVERSITY OF ARIZONA / NASA / SCIENCE PHOTO LIBRARY
Satellite image of a conical pit on the side of Pavonis Mons, a giant shield volcano on Mars. At the centre of the pit is a hole (black) that opens up into a cavern in the volcano. A debris pile (grey) of material that has fallen from the pit can be seen through the hole. The pile is at least 62 metres tall, with its top 28 metres below the rim of the pit. Image obtained by the High Resolution Imaging Science Experiment (HiRISE) on NASA's Mars Reconnaissance Orbiter satellite.
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