File:Mars; Arsia Mons cave entrance -MRO.jpg

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Original file ‎(1,610 × 1,476 pixels, file size: 528 KB, MIME type: image/jpeg)

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English: Dark pits on some of the Martian volcanoes have been speculated to be entrances into caves. A previous HiRISE image, looking essentially straight down, saw only darkness in this pit.

This time the pit was imaged from the west. Since the picture was taken at about 2:30 p.m. local (Mars) time, the sun was also shining from the west. We can now see the eastern wall of the pit catching the sunlight.

This confirms that this pit is essentially a vertical shaft cut through the lava flows on the flank of the volcano. Such pits form on similar volcanoes in Hawaii and are called "pit craters." They generally do not connect to long open caverns but are the result of deep underground collapse. From the shadow of the rim cast onto the wall of the pit we can calculate that the pit is at least 178 meters (584 feet) deep. The pit is 150 x 157 meters (492 x 515 feet) across. Written by: Laszlo P. Keszthelyi

Original release: 29 August 2007 (from http://hirise.lpl.arizona.edu/PSP_004847_1745)

The original NASA image has been modified by lightening shadows, adjusting brightness and contrast, removing artifacts and doubling the linear pixel density.
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http://hirise.lpl.arizona.edu/images/2007/details/cut/PSP_004847_1745_cut_b.jpg

For context see: https://www.uahirise.org/PSP_004847_1745
Author NASA / Jet Propulsion Laboratory / University of Arizona
Other versions Possible cave entrance on Arsia Mons.png - less processed version

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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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Date/TimeThumbnailDimensionsUserComment
current05:12, 6 November 2012Thumbnail for version as of 05:12, 6 November 20121,610 × 1,476 (528 KB)WolfmanSF (talk | contribs)tweak brightness, contrast; double linear pixel density
04:44, 2 November 2012Thumbnail for version as of 04:44, 2 November 2012805 × 738 (317 KB)WolfmanSF (talk | contribs)Decrease brightness, increase contrast
04:25, 2 November 2012Thumbnail for version as of 04:25, 2 November 2012805 × 738 (305 KB)WolfmanSF (talk | contribs)Darken unilluminated portion of image
09:00, 27 February 2011Thumbnail for version as of 09:00, 27 February 2011805 × 738 (347 KB)WolfmanSF (talk | contribs){{Information |Description ={{en|1=Dark pits on some of the Martian volcanoes have been speculated to be entrances into caves. A previous HiRISE image, looking essentially straight down, saw only darkness in this pit. This time the pit was imaged from

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