CRISM Corner |
CRISM Corner |
Guest_AlexBlackwell_* |
Sep 28 2006, 02:14 AM
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#1
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APL-Built Mineral-Mapping Imager Begins Mission at Mars
JHU/APL For Immediate Release September 27, 2006 See also A.J.S. Rayl's story at TPS. EDIT: I changed the topic title because, as I understand it from the press release, the cover was opened, not jettisoned. This post has been edited by AlexBlackwell: Sep 28 2006, 04:48 PM |
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Sep 25 2007, 09:49 AM
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#2
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Founder Group: Chairman Posts: 14434 Joined: 8-February 04 Member No.: 1 |
They got it - CRISM of the MGS gullies.
http://crism.jhuapl.edu/gallery/featuredIm...amp;image_id=95 It's looking like dust slides. Doug |
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Sep 25 2007, 10:24 AM
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#3
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
It's looking like dust slides. Well, it was fun while it lasted. -------------------- |
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Sep 25 2007, 01:16 PM
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#4
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Member Group: Members Posts: 593 Joined: 20-April 05 Member No.: 279 |
Well, it was fun while it lasted. Is it over? I don't see how "Dust slides" per se answer questions relating to the face of slopes, which I believe tend to show a preference in terms of their bearing. And if these slides were caused by liquid water, then that water would evaporate quickly from the scene. So the surface materials brought down by undermining and slip wouldn't have the chance to be modified by salts in the water, and might still chemically resemble dry surface materials from around the area... Andy, needing more evidence one way or another. |
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Sep 26 2007, 02:10 PM
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#5
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Member Group: Members Posts: 267 Joined: 5-February 06 Member No.: 675 |
Is it over? I don't see how "Dust slides" per se answer questions relating to the face of slopes, which I believe tend to show a preference in terms of their bearing.... But the sample of gullies studied recently in Science by McEwen et al. show: QUOTE There is no favored slope aspect: The bright deposits are on east-, west-, equator-, and pole-facing slopes. Clearly a systematic sampling of the orientation of a large number of gullies is needed to resolve this, but the slope aspect does not seem to be a convincing argument for melting water (or CO2). Steve M |
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Sep 26 2007, 03:04 PM
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#6
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Member Group: Members Posts: 401 Joined: 5-January 07 From: Manchester England Member No.: 1563 |
Gullies have been observed on slopes too shallow to support a dry flow, which argues for some kind of volatile. But I dont know much about the mechanics of dust slides, perhaps a violent event (an impact?) could trigger a dust slide on a slope otherwise to gentle. Also; would it be possible for anyone to confirm or deny that CRISM would not pick up chloride salts? I agree that the CRISM data puts a dent in the gullies=water argument but I'm a long way from being convinced its dead. And although I dont give it much credence personally we've yet to see anything that kills the 'exploding CO2' theory.( Minor rant incoming) Press releases on mars water seem to fall into two camps: 'mars is bone dry' or 'mars is soaking wet'. I'd like to see one that falls into the 'mars is definately icy and may be slightly damp' catagory!
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