Last Chance (Mars): Difference between revisions
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'''Last Chance''' is a layered rock outcrop found within the [[Margaritifer Sinus quadrangle]] (MC-19) region of the planet [[Mars]], discovered by the [[Mars Exploration Rover]] ''[[Opportunity rover|Opportunity]]'' in March 2004. The rock lies within the outcrop near the rover's landing site at [[Meridiani Planum]], Mars. |
'''Last Chance''' is a layered rock outcrop found within the [[Margaritifer Sinus quadrangle]] (MC-19) region of the planet [[Mars]], discovered by the [[Mars Exploration Rover]] ''[[Opportunity rover|Opportunity]]'' in March 2004. The rock lies within the outcrop near the rover's landing site at [[Meridiani Planum]], Mars. |
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Images returned show evidence for a geologic feature known as [[Ripple marks|ripple]] [[cross-stratification]]. At the base of the rock, layers can be seen dipping downward to the right. The bedding that contains these dipping layers is only one to two centimeters (0.4 to 0.8 inches) thick. In the upper right corner of the rock, layers also dip to the right, but exhibit a weak "concave-up" geometry. These two features—the thin, cross-stratified bedding combined with the possible concave geometry—suggest small ripples with sinuous crest lines. Although [[wind]] can produce ripples, they rarely have sinuous crest lines and never form steep, dipping layers at such a small scale. The most probable explanation for these ripples is that they were formed in the presence of moving [[Water on Mars|water]].<ref> |
Images returned show evidence for a geologic feature known as [[Ripple marks|ripple]] [[cross-stratification]]. At the base of the rock, layers can be seen dipping downward to the right. The bedding that contains these dipping layers is only one to two centimeters (0.4 to 0.8 inches) thick. In the upper right corner of the rock, layers also dip to the right, but exhibit a weak "concave-up" geometry. These two features—the thin, cross-stratified bedding combined with the possible concave geometry—suggest small ripples with sinuous crest lines. Although [[wind]] can produce ripples, they rarely have sinuous crest lines and never form steep, dipping layers at such a small scale. The most probable explanation for these ripples is that they were formed in the presence of moving [[Water on Mars|water]].<ref>{{Cite web |url=http://www.jpl.nasa.gov/missions/mer/images-print.cfm?id=1022 |title="Last Chance" Evidence of Ancient Water Flow |access-date=2006-11-26 |archive-url=https://web.archive.org/web/20110605010533/http://www.jpl.nasa.gov/missions/mer/images-print.cfm?id=1022 |archive-date=2011-06-05 |url-status=dead }}</ref> |
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==External links== |
==External links== |
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*[http://mars.jpl.nasa.gov/ Nasa's Mars Exploration Program] |
*[https://web.archive.org/web/20100216233133/http://mars.jpl.nasa.gov/ Nasa's Mars Exploration Program] |
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{{MarsRocks}} |
{{MarsRocks}} |
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{{Features visited by Opportunity}} |
{{Features visited by Opportunity}} |
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Revision as of 15:59, 23 February 2020
 "Last Chance" rock outcrop on Mars. | |
| Feature type | Rock outcrop |
|---|---|
| Coordinates | 1°54′S 354°30′E / 1.9°S 354.5°E |
Last Chance is a layered rock outcrop found within the Margaritifer Sinus quadrangle (MC-19) region of the planet Mars, discovered by the Mars Exploration Rover Opportunity in March 2004. The rock lies within the outcrop near the rover's landing site at Meridiani Planum, Mars.
Images returned show evidence for a geologic feature known as ripple cross-stratification. At the base of the rock, layers can be seen dipping downward to the right. The bedding that contains these dipping layers is only one to two centimeters (0.4 to 0.8 inches) thick. In the upper right corner of the rock, layers also dip to the right, but exhibit a weak "concave-up" geometry. These two features—the thin, cross-stratified bedding combined with the possible concave geometry—suggest small ripples with sinuous crest lines. Although wind can produce ripples, they rarely have sinuous crest lines and never form steep, dipping layers at such a small scale. The most probable explanation for these ripples is that they were formed in the presence of moving water.[1]
See also
References
- ^ ""Last Chance" Evidence of Ancient Water Flow". Archived from the original on 2011-06-05. Retrieved 2006-11-26.
External links
Features on Mars visited by Opportunity | ||
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| Craters |   | |
| Endeavour | ||
| Rocks (list) | ||
 | This article about the planet Mars or its moons is a stub. You can help Wikipedia by expanding it. |
 | This article about an extraterrestrial geological feature is a stub. You can help Wikipedia by expanding it. |