File:Chasma Boreale, Mars.jpg
Summary
Chasma Boreale, a long, flat-floored <a href="//commons.wikimedia.org/wiki/Valley" title="Valley">valley</a>, cuts deep into Mars' north polar icecap. Its walls rise about 1,400 meters, above the floor. Where the edge of the ice cap has retreated, sheets of <a href="//commons.wikimedia.org/wiki/Sand" title="Sand">sand</a> are emerging that accumulated during earlier <a href="//commons.wikimedia.org/wiki/Ice" title="Ice">ice</a>-free climatic cycles. Winds blowing off the ice have pushed loose sand into dunes and driven them down-canyon in a westward direction. This scene combines images taken during the period from December 2002 to February 2005 by the Thermal Emission Imaging System instrument on NASA's <a href="//commons.wikimedia.org/wiki/Category:2001_Mars_Odyssey" title="Category:2001 Mars Odyssey">Mars Odyssey</a> was part of a special series of images marking the orbiter as the longest-working Mars spacecraft in history.
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 01:06, 14 January 2017 | | 4,000 × 2,000 (639 KB) | 127.0.0.1 (talk) | Chasma Boreale, a long, flat-floored <a href="//commons.wikimedia.org/wiki/Valley" title="Valley">valley</a>, cuts deep into Mars' north polar icecap. Its walls rise about 1,400 meters, above the floor. Where the edge of the ice cap has retreated, sheets of <a href="//commons.wikimedia.org/wiki/Sand" title="Sand">sand</a> are emerging that accumulated during earlier <a href="//commons.wikimedia.org/wiki/Ice" title="Ice">ice</a>-free climatic cycles. Winds blowing off the ice have pushed loose sand into dunes and driven them down-canyon in a westward direction. This scene combines images taken during the period from December 2002 to February 2005 by the Thermal Emission Imaging System instrument on NASA's <a href="//commons.wikimedia.org/wiki/Category:2001_Mars_Odyssey" title="Category:2001 Mars Odyssey">Mars Odyssey</a> was part of a special series of images marking the orbiter as the longest-working Mars spacecraft in history. |
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