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Collection:
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NASA Mars Collecton
Collection
NASA Mars Collecton
Collection
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title:
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Changes Over a Martian Year -- New Dark Slope Streaks in Lycus Sucli
title
Changes Over a Martian Year -- New Dark Slope Streaks in Lycus Sucli
title
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Description:
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Now in its Extended Mission, Mars Global Surveyor (MGS) is into its second Mars year of systematic observations of the red planet. With the Extended Mission slated to run through April 2002, the Mars Orbiter Camera (MOC) is being used, among other things, to look for changes that have occurred in the past martian year. Because Mars is farther from the Sun than Earth, its year is longer---about 687 Earth days. The two pictures shown here cover the same portion of Lycus Sulci, a rugged, ridged terrain north of the giant Olympus Mons volcano. The interval between the pictures span 92% of a martian year (August 2, 1999 to April 27, 2001). Dark streaks considered to result from the avalanching of dry, fine, bright dust are seen in both images. The disruption of the surface by the avalanching materials is thought to cause them to appear darker than their surroundings, just as the 1997 bouncing of Mars Pathfinder's airbags and the tire tracks made by the Sojourner rover left darkened markings indicating where the martian soil had been disrupted and disturbed. The arrows in the April 2001 picture indicate eight new streaks that formed on these slopes in Lycus Sulci since August 1999. These observations suggest that a new streak forms approximately once per martian year per kilometer (about 0.62 miles) along a slope. In both images, north is toward the top/upper right and sunlight illuminates each from the left. Dark (as well bright) slope streaks are most common in the dust-covered martian regions of Tharsis, Arabia, and Elysium. Additional examples of dark slope streaks can be seen in the following earlier MOC image media releases: * "Recent Movements: New Landslides in Less than 1 Martian Year," March 12, 2000 * "Dark Slope Streaks on Elysium Basin Buttes," July 19, 1999 Images Credit: NASA/JPL/Malin Space Science Systems
Description
Now in its Extended Mission, Mars Global Surveyor (MGS) is into its second Mars year of systematic observations of the red planet. With the Extended Mission slated to run through April 2002, the Mars Orbiter Camera (MOC) is being used, among other things, to look for changes that have occurred in the past martian year. Because Mars is farther from the Sun than Earth, its year is longer---about 687 Earth days. The two pictures shown here cover the same portion of Lycus Sulci, a rugged, ridged terrain north of the giant Olympus Mons volcano. The interval between the pictures span 92% of a martian year (August 2, 1999 to April 27, 2001). Dark streaks considered to result from the avalanching of dry, fine, bright dust are seen in both images. The disruption of the surface by the avalanching materials is thought to cause them to appear darker than their surroundings, just as the 1997 bouncing of Mars Pathfinder's airbags and the tire tracks made by the Sojourner rover left darkened markings indicating where the martian soil had been disrupted and disturbed. The arrows in the April 2001 picture indicate eight new streaks that formed on these slopes in Lycus Sulci since August 1999. These observations suggest that a new streak forms approximately once per martian year per kilometer (about 0.62 miles) along a slope. In both images, north is toward the top/upper right and sunlight illuminates each from the left. Dark (as well bright) slope streaks are most common in the dust-covered martian regions of Tharsis, Arabia, and Elysium. Additional examples of dark slope streaks can be seen in the following earlier MOC image media releases: * "Recent Movements: New Landslides in Less than 1 Martian Year," March 12, 2000 * "Dark Slope Streaks on Elysium Basin Buttes," July 19, 1999 Images Credit: NASA/JPL/Malin Space Science Systems Description
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section:
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Martian Terrain
section
Martian Terrain
section
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facet_what:
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Mars
facet_what
Mars
facet_what
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facet_what:
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Earth
facet_what
Earth
facet_what
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facet_what:
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Sun
facet_what
Sun
facet_what
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facet_what:
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Surveyor
facet_what
Surveyor
facet_what
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facet_what:
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Mars Pathfinder
facet_what
Mars Pathfinder
facet_what
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facet_what:
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Mars Global Surveyor Orbiter (MGS)
facet_what
Mars Global Surveyor Orbiter (MGS)
facet_what
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facet_what:
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Mars Orbiter Camera (MOC)
facet_what
Mars Orbiter Camera (MOC)
facet_what
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facet_where:
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Mars
facet_where
Mars
facet_where
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facet_where:
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Jet Propulsion Laboratory (JPL)
facet_where
Jet Propulsion Laboratory (JPL)
facet_where
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facet_when:
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April 2002
facet_when
April 2002
facet_when
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facet_when:
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April 2001
facet_when
April 2001
facet_when
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facet_when:
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August 2, 1999
facet_when
August 2, 1999
facet_when
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facet_when:
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April 27, 2001
facet_when
April 27, 2001
facet_when
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facet_when:
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August 1999
facet_when
August 1999
facet_when
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facet_when:
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March 12, 2000
facet_when
March 12, 2000
facet_when
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facet_when:
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July 19, 1999
facet_when
July 19, 1999
facet_when
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facet_when_year:
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2001
facet_when_year
2001
facet_when_year
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facet_when_year:
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2000
facet_when_year
2000
facet_when_year
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facet_when_year:
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1999
facet_when_year
1999
facet_when_year
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facet_when_year:
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2002
facet_when_year
2002
facet_when_year
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UID:
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SPD-MARS-gallery/mar tianterrain/E3-2374_ M3-6336subs_100.html
UID
SPD-MARS-gallery/mar tianterrain/E3-2374_ M3-6336subs_100.html
UID
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original url:
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original_url
original url
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