March 20, 2014 - A new gully
has appeared on a sloped crater wall on Mars. The channel, which was absent from images in November 2010 but showed up in a May 2013 photo, does not appear to have been formed by water. Exactly what caused this Red Planet rivulet remains a mystery.
The winding gully seems to have poured out from an existing ribbon channel in a crater in Mars’ Terra Sirenum
region. The leading hypothesis on how the gully formed is that debris flowed downslope from an alcove and eroded a new channel. Though it looks water-carved, the gully is much more likely to have been formed when carbon dioxide frost accumulated on the slope and grew heavy enough to avalanche down and drag material down with it.
Because the pair of images, taken by the orbiting HiRISE
camera onboard NASA’s Mars
Reconnaissance Orbiter, were taken more than a year apart, scientists don’t know in exactly which season the new gully formed.
Sources and more information:
• Bluesun 2600: Mysterious New Gully Spotted on Mars - Wired Science
Image: NASA JPL-Caltech Univ. of Arizona
A new gully has appeared on a sloped crater wall on Mars. The channel, which was absent from images in November 2010 but showed up in a May 2013 photo, does not appear to have been formed by water. Exactly what caused this Red Planet rivulet remains a mystery.
• NASA's Mars Orbiter Detects Newly Formed Martian Gully
NASA's Orbiter has recently documented a newly formed gully in the southern hemisphere of the Martian slope that formed between 2010 and 2012, but not due to water, according to latest news.
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The space agency confirmed the formation of the new channel on the Martian slope after scientists analyzed the images taken by the High...
• These Before-And-After Shots Confirm A New Gully Has Formed On Mars!
• Mars Reconnaissance Orbiter Finds New Gully Channel on Mars
• NASA's Mars Reconnaissance Orbiter discovers formation of new Gully on Mars
( via wired.com