Entrance to the Martian Underworld

Cave entrance at floor of Martian crater
A cave entrance at the floor of a Martian crater. Credit: NASA/JPL/University of Arizona

When Mars explorers spotted an unusual dark patch in a crater on the slopes of a volcano, they decided to investigate. What they found was interesting: the spot turned out to be a skylight, an entrance to an underground cavern. The opening is about 115 feet across and the pit is about 65 feet deep. Learn more about how such caverns form.

Sent by: Mars Reconnaissance Orbiter | From: Mars | Released: August, 2011 | Credit: NASA/JPL/UA | Image source

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