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The HiRISE (High Resolution Imaging Science Experiment) camera on the Mars Reconnaissance Orbiter has detected a very dark spot on the surface of Mars that appears to be the entrance to a cavern or cave.

The entrance to the cave measures approximately 100 m across and was found on a dusty lava plain to the northeast of Arsia Mons. Even though the HiRISE camera is extremely sensitive and can see details in almost any shadow on Mars, it was unable to see any details in the dark region suggesting that it must be very deep. It was also unable to see any walls, suggesting that the walls of the cave must be either perfectly vertical, extremely dark, or overhanging.

Posted by fr584 at 17:00 on July 14th, 2009 at 5:00PM

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