File:Pavonis_Mons_lava_tube_skylight_crop.jpg
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Summary
DescriptionPavonis Mons lava tube skylight crop.jpg |
English: This is a cropped version of a HiRISE image of a lava tube skylight on the martian volcano Pavonis Mons. The original caption for the photo on the HiRISE web site is as follows:
Earlier this year, the CTX camera team saw a crater containing a dark spot on the dusty slopes of the Pavonis Mons volcano. We took a closer look at this feature with HiRISE and found this unusual geologic feature. The dark spot turned out to be a "skylight," an opening to an underground cavern, that is 35 meters (115 feet) across. Caves often form in volcanic regions like this when lava flows solidify on top, but keep flowing underneath their solid crust. These, now underground, rivers of lava can then drain away leaving the tube they flowed through empty. We can use the shadow cast on the floor of the pit to calculate that it is about 20 meters (65 feet) deep. The origin of the larger hole that this pit is within is still obscure. You can see areas where material on the walls has slid into the pit. How much of the missing material has disappeared via the pit into the underground cavern? Later this year, HiRISE will acquire a second image to create a stereo pair. Seeing this feature in stereo will help us unravel the mystery of its formation. Written by: Shane Byrne (17 August 2011) |
Date | |
Source | http://hirise.lpl.arizona.edu/ESP_023531_1840 |
Author | NASA / Jet Propulsion Laboratory / University of Arizona |
Licensing
Public domainPublic domainfalsefalse |
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/Time | Thumbnail | Dimensions | User | Comment | |
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current | 06:02, 18 July 2012 | 1,920 × 1,920 (1.08 MB) | WolfmanSF |
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Metadata
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Orientation | Normal |
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Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop Elements 9.0 Windows |
File change date and time | 22:48, 17 July 2012 |
Color space | sRGB |
Image width | 1,920 px |
Image height | 1,920 px |
Date and time of digitizing | 08:51, 15 September 2009 |
Date metadata was last modified | 15:48, 17 July 2012 |
Unique ID of original document | uuid:183BB7C606F9DD11BA66D1AD63D425C6 |