Mysterious New Gully Spotted on Mars
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.
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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 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. Like Us on Facebook The space agency confirmed the formation of the new channel on the Martian slope after scientists analyzed the images taken by the High...
( via wired.com )
garyproffitt3 wrote March 23, 2014 2:26:47 AM CET
These are my very favourite images, those being the wonderful information gathered by the Mars
Reconnaissance Orbiter which may not be the best camera currently active in the Solar system
but is the only one active around another rocky planet and delivers a vast array of scientific data including path finding data for the current Curiosity rovers exploits at Gale crater.
I have done some research work myself and have concluded that there are great changes in the
structure of small ravines that adjoin areas like this and crater walls and we really don't have a great
deal of knowledge on the subject of seasonal material flow mechanics on Mars and have only recently learned that water actually flows at certain times of the Martian year in these very same types of areas.
So what flows on Mars? well we have Air of course though rather little of it, water but again only in rare instances, dry ice in the form of chunks and Rocks, gravel and dust and this may just be a feature that was hidden under dust and debris that was excavated by the movement of heavier material like dry ice or rocks.