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Where is the zebra?
SigurRosFan
post May 12 2006, 02:42 PM
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- http://www.msss.com/mars_images/moc/2006/05/12/


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Guest_Richard Trigaux_*
post May 12 2006, 05:51 PM
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Very interesting image, SigurRosFan.

A bit puzzling, because of bottom lighting. I managed to see it correctly with head tilted horizontally to the right. The left part of the image appears lower, and the slope in front of us.


What is interesting is th fact that the dark streaks don't stop at the borrom on the slope, but somewhat continue on the flat bottom. This is an evidence that it is a dynamic process, occuring at high speed, not a slow crawling process.

On some parts of the bottom at the foot of the slope, the ground shapes appear slightly obliterated. This is an evidence that these dust avalanches were numerous in the past, but that they carry little dust at a time. This conforts the theory as what they are formed by falling dust accumulating on the ground.

At last, there are many streaks of roughly the same age here. Perhaps a quake triggered them all in the same time.

Acheron fossae is a puzzling small zone of highly fractured terrain showing many horsts and grabens*, north of Olympus mons. It seems recent, and perhaps still active. It is part of the overall fault belt around Tharsis plateau.

*horsts and grabens: parallel parts of terrains, uplifted or subsided, between parallel faults.
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RNeuhaus
post May 12 2006, 07:25 PM
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The picture is puzzling.

I don't think that these black strips are the product of Dust Devils neither of gullies.

The most probably guess is that between the bottom and upper land, at the middle zone is of other composition, maybe, some ice liquid was melted and the it carried out the naked and dark land to down. The flow direction is from right to left of picture.

However, I seems that the action of melting liquid is not the only factor but also of aeolian factor. This might be the main source that causes this phenomen.

Rodolfo
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Guest_Richard Trigaux_*
post May 12 2006, 07:44 PM
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The most comonly accepted explanation about these "liquid like" dark streaks is that they are dust avalanches. The process is as follows: every day a thin dust descends on mars ground (which was carried in the atmosphere by dust devils and large storms). This dust is light colored, a bit reddish. It accumulates on slopes too, but when it reaches beyond the equilibrium point, an avalanche occurs. This avalanche may be very thin, about a some millimetre dust layers. But when it flows, it left the darker terrain under to appear, creating these black streaks which strangely look wet, but are not. It is in the frame of this explanation that I commented above.
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Guest_PhilCo126_*
post May 12 2006, 07:45 PM
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Possibly a candidate terrain for these manufacturers ?
http://www.spacemodelsystems.com/terrains.html
huh.gif
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RNeuhaus
post May 12 2006, 08:00 PM
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Now I can see better that the avalanches are due to the bonding of dust by somewhat. It might be due to humidity. I have observed after I have caused an avalanche of sand of a dessert. The shape of avalanche of sand looks very similar to the ones of picture. Then I recognize that its shape is of avalanche of sand or dust and not of liquid. The avalanche of sand is not of pyramidal shape but very vertical and narrow shape.

Rodolfo

QUOTE (PhilCo126 @ May 12 2006, 02:45 PM) *
Possibly a candidate terrain for these manufacturers ?
http://www.spacemodelsystems.com/terrains.html
huh.gif

Phil, very interesting WEB! computer simulations of terrain model.

Rodolfo
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Guest_PhilCo126_*
post May 12 2006, 08:18 PM
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Don't know if Kees is on this forum, but he's a Dutch guy with an interesting website:
http://www.space4case.com/index/index1.html
ohmy.gif
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Bob Shaw
post May 12 2006, 10:43 PM
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QUOTE (PhilCo126 @ May 12 2006, 09:18 PM) *
Don't know if Kees is on this forum, but he's a Dutch guy with an interesting website:
http://www.space4case.com/index/index1.html
ohmy.gif


Beautiful renderings, but with all those light effects I think that Zaphod Beeblebrox *might* have described some of the images as 'needlessly Messianic'!

QUOTE (PhilCo126 @ May 12 2006, 08:45 PM) *
Possibly a candidate terrain for these manufacturers ?
http://www.spacemodelsystems.com/terrains.html
huh.gif


Please *don't* let Phil Stooke see this URL - it'd be *bad* for him (gave me quite a turn, too!):

http://www.spacemodelsystems.com/globes.html

Bob Shaw


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volcanopele
post May 12 2006, 10:52 PM
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QUOTE (PhilCo126 @ May 12 2006, 12:45 PM) *
Possibly a candidate terrain for these manufacturers ?
http://www.spacemodelsystems.com/terrains.html
huh.gif

WOW! I hadn't seen this website before!

Me want! Me want RIGHT NOW: http://www.spacemodelsystems.com/tohil.html

biggrin.gif


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Phil Stooke
post May 12 2006, 11:20 PM
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"Please *don't* let Phil Stooke see this URL - it'd be *bad* for him"

I'm not that emotionally fragile, Bob.

Phil


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Bob Shaw
post May 12 2006, 11:27 PM
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Phil:

Well, I certainly am!

My desk is, anyway...

Bob Shaw


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Remember: Time Flies like the wind - but Fruit Flies like bananas!
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Guest_Myran_*
post May 13 2006, 12:29 PM
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QUOTE
PhilCo126 mentioned Kees website


I can only add athat I recommend it too, used to have one of Kees illustrations of Kasei on my desktop for nearly a year. Nowadays im here I change more often for some odd reason! tongue.gif
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Guest_PhilCo126_*
post May 14 2006, 10:54 AM
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It is a great website, for the moment I'm awaiting the re-edition of the two-foot Mars globe ... love to have one of those !
cool.gif mars.gif
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nprev
post May 14 2006, 06:35 PM
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QUOTE (volcanopele @ May 12 2006, 03:52 PM) *
WOW! I hadn't seen this website before!

Me want! Me want RIGHT NOW: http://www.spacemodelsystems.com/tohil.html

biggrin.gif



Oh, man...that is so cool!!!! Me want right now too!!!! biggrin.gif


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Guest_paulanderson_*
post May 16 2006, 03:47 AM
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QUOTE (Richard Trigaux @ May 12 2006, 12:44 PM) *
The most comonly accepted explanation about these "liquid like" dark streaks is that they are dust avalanches. The process is as follows: every day a thin dust descends on mars ground (which was carried in the atmosphere by dust devils and large storms). This dust is light colored, a bit reddish. It accumulates on slopes too, but when it reaches beyond the equilibrium point, an avalanche occurs. This avalanche may be very thin, about a some millimetre dust layers. But when it flows, it left the darker terrain under to appear, creating these black streaks which strangely look wet, but are not. It is in the frame of this explanation that I commented above.

Perhaps, but not all scientists are convinced that they are dust avalanches:

http://www.space.com/scienceastronomy/stre...ars_021211.html

Independent researcher Efrain Palermo had also published a good paper and compiled an excellent "stain map"; he presented his findings, along with Jill England, to the National Space Society in 2002 and the Mars Society Convention in 2001:

http://palermoproject.com/Mars_Anomalies/%...ySeepsPaper.pdf

http://palermoproject.com/Mars_Anomalies/MarsStainMap.html

http://palermoproject.com/Mars_Anomalies/updated_images.html

And no, they are not affiliated with Hoagland / TEM, before anybody asks...

I might have some other references also, but I need to find them again. There has been just as much debate about these features as the other gullies.
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