Sol 22 and after, Digging in Wonderland |
Sol 22 and after, Digging in Wonderland |
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Solar System Cartographer ![]() ![]() ![]() ![]() Group: Members Posts: 10196 Joined: 5-April 05 From: Canada Member No.: 227 ![]() |
Here's a Sol 22 image of the new trenching area at the extreme right edge of the work area. I brightened the shadow to show the whole trench.
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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#2
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![]() The Poet Dude ![]() ![]() ![]() ![]() Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 ![]() |
Glad they arrived safely Nick.
![]() Meanwhile, over in 2D land, poor Snow White is looking really battered now... -------------------- |
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#3
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![]() Merciless Robot ![]() ![]() ![]() ![]() Group: Admin Posts: 8784 Joined: 8-December 05 From: Los Angeles Member No.: 602 ![]() |
Meanwhile, over in 2D land, poor Snow White is looking really battered now... Sure is, and if my hypothesis is valid then so will every other dig in this area over time. Hmm. Going out on a limb here. The North Polar region (Vastias Borealis) is very smooth and quite broad in terms of surface area, while the South Polar region really isn't, except at very high latitudes, and even then it ain't the same. Impact cratering rates would presumably be statistically equal for both regions. There does seem to be a mechanism for autosmoothing of terrain in the north, namely subsurface ice exposure/sublimation/mass repositioning. Does this mean that subsurface water ice is preferentially concentrated in the North Polar region....and, if so, why? I understand that the Southern Hemisphere is orographically higher than the north, but does a difference of just a few millibars of atmospheric pressure at most make that much of a difference in the behavior of ice sublimation/deposition? The hemispheric dichotomy is puzzling, even considering surface topography. Is there a similar dichotomy in crustal composition between the poles? -------------------- 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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#4
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![]() Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2530 Joined: 20-April 05 Member No.: 321 ![]() |
I think the scales are so utterly different as to bear no relationship:
The smooth/rough impression comes from MOLA maps, which emphasize difference on the scale of hundreds of meters or more. The soil overlying the ice is centimeters -- we're talking about several orders of magnitude difference. My take is that the smooth/rough difference between the poles is about a single catastrophic flow event that buried the lower elevations planet-wide in slurry and paved over the cratered highlands. The subsurface ice at these latitudes is probably something that would seep back in in a whisper of geological time if you removed it and let it emplace itself anew, but not on a scale to erase massive craters and canyons in the ancient highlands. |
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