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#1
June 13th 04, 11:17 AM
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Another explanation of the martian "spiders".
The "spiders" are raised regions in the polar regions of the Mars that
have dendritic troughs emanating from a central point. This page has an extensive collection of them: http://www.martianspiders.com/ Kieffer et.al. propose an explanation based on CO2 gas flows.: Annual punctuated CO2 slab-ice and jets on Mars. http://www.lpi.usra.edu/meetings/polar2000/pdf/4095.pdf However, another possibility is that they are low, flat pingos: Pingos, Prince Patrick Island. http://iss.gsc.nrcan.gc.ca/page1/lan...atrick/p13.htm Pingos are usually regarded as conical hills. The low, flat pingos on Prince Patrick Island are the only examples I've found with this shape. Some examples of the more common conical pingos: BOAT TO THE PINGOES http://www.auroranet.nt.ca/atc/noframe/tour12.htm Pingos http://sts.gsc.nrcan.gc.ca/beaufort_...CaID=7&PgID=37 Pingos http://www.arctic.uoguelph.ca/cpe/en...aw/pingoes.htm Bob Clark 
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