Where is the zebra? |
Where is the zebra? |
May 12 2006, 02:42 PM
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#1
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Member Group: Members Posts: 531 Joined: 24-August 05 Member No.: 471 |
-------------------- - blue_scape / Nico -
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Guest_Richard Trigaux_* |
May 12 2006, 05:51 PM
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#2
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Guests |
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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May 12 2006, 07:25 PM
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#3
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Senior Member Group: Members Posts: 1636 Joined: 9-May 05 From: Lima, Peru Member No.: 385 |
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_* |
May 12 2006, 07:44 PM
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#4
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Guests |
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_* |
May 12 2006, 07:45 PM
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#5
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Possibly a candidate terrain for these manufacturers ?
http://www.spacemodelsystems.com/terrains.html |
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May 12 2006, 08:00 PM
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#6
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Senior Member Group: Members Posts: 1636 Joined: 9-May 05 From: Lima, Peru Member No.: 385 |
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 Possibly a candidate terrain for these manufacturers ? http://www.spacemodelsystems.com/terrains.html Phil, very interesting WEB! computer simulations of terrain model. Rodolfo |
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Guest_PhilCo126_* |
May 12 2006, 08:18 PM
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#7
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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 |
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May 12 2006, 10:43 PM
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#8
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Senior Member Group: Members Posts: 2488 Joined: 17-April 05 From: Glasgow, Scotland, UK Member No.: 239 |
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 Beautiful renderings, but with all those light effects I think that Zaphod Beeblebrox *might* have described some of the images as 'needlessly Messianic'! Possibly a candidate terrain for these manufacturers ? http://www.spacemodelsystems.com/terrains.html 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 -------------------- Remember: Time Flies like the wind - but Fruit Flies like bananas!
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May 12 2006, 10:52 PM
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#9
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Senior Member Group: Moderator Posts: 3233 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
Possibly a candidate terrain for these manufacturers ? http://www.spacemodelsystems.com/terrains.html WOW! I hadn't seen this website before! Me want! Me want RIGHT NOW: http://www.spacemodelsystems.com/tohil.html -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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May 12 2006, 11:20 PM
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#10
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Solar System Cartographer Group: Members Posts: 10151 Joined: 5-April 05 From: Canada Member No.: 227 |
"Please *don't* let Phil Stooke see this URL - it'd be *bad* for him"
I'm not that emotionally fragile, Bob. Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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May 12 2006, 11:27 PM
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#11
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Senior Member Group: Members Posts: 2488 Joined: 17-April 05 From: Glasgow, Scotland, UK Member No.: 239 |
Phil:
Well, I certainly am! My desk is, anyway... Bob Shaw -------------------- Remember: Time Flies like the wind - but Fruit Flies like bananas!
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Guest_Myran_* |
May 13 2006, 12:29 PM
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#12
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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! |
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Guest_PhilCo126_* |
May 14 2006, 10:54 AM
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#13
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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 !
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May 14 2006, 06:35 PM
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#14
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Merciless Robot Group: Admin Posts: 8783 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
WOW! I hadn't seen this website before! Me want! Me want RIGHT NOW: http://www.spacemodelsystems.com/tohil.html Oh, man...that is so cool!!!! Me want right now too!!!! -------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Guest_paulanderson_* |
May 16 2006, 03:47 AM
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#15
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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. 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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