Posted on 03/03/2008 5:02:10 PM PST by NormsRevenge
A NASA spacecraft in orbit around Mars has taken the first ever image of active avalanches near the Red Planet's north pole. The image shows tan clouds billowing away from the foot of a towering slope, where ice and dust have just cascaded down.
The High Resolution Imaging Experiment (HiRISE) on NASA's Mars Reconnaissance Orbiter took the photograph Feb. 19. It is one of approximately 2,400 HiRISE images being released today.
Ingrid Daubar Spitale of the University of Arizona, Tucson, who works on targeting the camera and has studied hundreds of HiRISE images, was the first person to notice the avalanches. "It really surprised me," she said. "It's great to see something so dynamic on Mars. A lot of what we see there hasn't changed for millions of years."
The camera is looking repeatedly at selected places on Mars to track seasonal changes. However, the main target of the Feb. 19 image was not the steep slope.
"We were checking for springtime changes in the carbon-dioxide frost covering a dune field, and finding the avalanches was completely serendipitous," said Candice Hansen, deputy principal investigator for HiRISE, at NASA's Jet Propulsion Laboratory, Pasadena, Calif.
The full image reveals features as small as a desk in a strip of terrain 6 kilometers (3.7 miles) wide and more than 10 times that long, at 84 degrees north latitude. Reddish layers known to be rich in water ice make up the face of a steep slope more than 700 meters (2,300 feet) tall, running the length of the image.
"We don't know what set off these landslides," said Patrick Russell of the University of Berne, Switzerland, a HiRISE team collaborator. "We plan to take more images of the site through the changing Martian seasons to see if this kind of avalanche happens all year or is restricted to early spring."
More ice than dust probably makes up the material that fell from the upper portion of the scarp. Imaging of the site during coming months will track any changes in the new deposit at the base of the slope. That will help researchers estimate what proportion is ice.
"If blocks of ice broke loose and fell, we expect the water in them will be changing from solid to gas," Russell said. "We'll be watching to see if blocks and other debris shrink in size. What we learn could give us a better understanding of one part of the water cycle on Mars."
Another notable HiRISE image released today shows a blue crescent Earth and its moon, as seen by the Mars Reconnaissance Orbiter. The west coast of South America is visible in the photo. Still other images allow viewers to explore a wide variety of Martian terrains, such as dramatic canyons and rhythmic patterns of sand dunes.
The camera is one of six science instruments on the orbiter. The spacecraft reached Mars in March 2006 and has returned more data than all other current and past missions to Mars combined.
"Our Mars program is the envy of the world," said Alan Stern, associate administrator of NASA's Science Mission Directorate, Washington. "We plan to launch a total of five more missions in the next decade, beginning with the Mars Science Lab rover next year and a Mars Aeronomy Scout mission in 2011."
All the newly posted and previously posted images from the High Resolution Imaging Science Experiment are available online at http://hirise.lpl.arizona.edu.
The MRO mission is managed by JPL for NASA's Science Mission Directorate, Washington. Lockheed Martin Space Systems, Denver, Colo., is the prime contractor for the project and built the spacecraft. The University of Arizona operates the High Resolution Imaging Science Experiment camera, which was built by Ball Aerospace and Technology Corp., Boulder, Colo.
That is either Algore Global Warming lie being found out... or Billary getting a stake through the heart in Texas and Ohio!
It was taken in the very northern pole region of the planet so just about any way you look at it you are looking down.
Man oh man you can see the bedrock then the layers above it... could be salt, not limestone. But NO PART of that pic looks volcanic. It’s oceanic fur sure! Wow!!
It’s a freakin disgrace we aren’t there yet. A disgrace.
Best Dune line:
Stilgar - "Usul.....we have wormsign the likes of which God has never seen!"
There’s another possibility I just thought of - the white strip might be - I reiterate “might” be...
ice.
yeah you’re right heh
......limestone......
Limestone involves water sediments.
Volcanic dust in stratified layers needs no water.
“Now, translate that from what I see now to a million years ago.”
Look at the Andromeda galaxy through binoculars.
Your are seeing the light from those stars as they were, millions of years ago.
It is all a simple matter of distance, and speed of light.
I know what limestone is.
I think the color betrays the volcanic dust idea. But we’re not there, so can’t say for sure.
Thank you that is so COOL!
susie
Is that, like, "alien-on-alien" action?
Little green men are kinky, I'm not into that...
The article states that it was taken near the north pole, so I’m ‘assuming the white stuff is frozen CO2.
Dry ice sublimates pretty easily. I doubt it could exist long at all at the pressures on Mars.
If that’s the case it looks like snowboarders heaven.
But not if one believes in creation, for light was instantaneous.
“But not if one believes in creation, for light was instantaneous.”
Well then it would have to have been created to intentionally appear as old light. And the creation would have to have been done in such a way to be pre-aged by billions of years.
If that works for you great.
But that light IS old and from a very very distant source.
I agree.
Like I said, maybe ice itself.
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