|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Mars: Liquid Surface Water Evidence
http://www.scireview.de/mars/ Here main part of the intro but without marked links to image-pages: Evidence for Liquid Surface Water on Mars (...) One indication of near surface liquid water are the so called pseudocraters, rootless cones created by explosive steam vents. They are common in some areas of Mars and a recent study of pseudocraters indicates their creation in present geological time ( 10 million years) through lava / water interaction up to 10 meters below the ground [3]. At least one MGS image (AB103104) seems to show such a venting, but on a rather small and less violent scale. Here the eruption plume is associated with a black streak area. Such black streaks were long suspected in relation with water [4]. The dark color could be the chemical response of the UV activated martian soil to water. All MOC images from Aerobraking-1 (AB1), Science Phasing-1 (SP1) and 2 (SP2) and High-Gain Antenna Images (fha) stored at IDA and MSSS were screened regarding: 1.0 Unusual black streaks 1.1 Unusual albedo situations perhaps related to black streaks 1.2 Black streaks related to possible ponds Contrary to public opinion, some areas of Mars have today the pressure and temperature range to allow stable liquid water [5]. But no lakes have been observed in these regions. Therefore any pond could only be temporary and should be dark colored according the black streak / water hypothesis. 2. Evaporites Any water from subsurface Mars is probably very salty. As it evaporates the salt will remain and accumulate over time to evaporite structures. Complex evaporite structures are rather rare on Earth, but seem to be very common on Mars. If the source is a single hole, a cone-like structure will evolve. If the source is a crack line, a ridge evolves. Two crossing cracks like an X will create a four-sided pyramid, and so on. It seems possible that evaporites created most types of geometrical and irregular structure on Mars. 2.1 Evaporites related to flow phenomena and ridges 2.2 Evaporites at crater rims 2.3 Evaporites in crater center 2.4 Evaporites burying craters 3. Additional THEMIS Evidence 3.1 The cloud pillars of Arabia 3.2 A northern Meridiani venting site 3.3 A northern Noachis venting site (...) ## CrossPoint v3.12d R ## |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Near surface liquid water on Mars. | Robert Clark | Astronomy Misc | 49 | March 11th 04 10:22 PM |
Mars Colonization | Remy Villeneuve | Policy | 36 | January 3rd 04 12:07 AM |
Space Calendar - November 26, 2003 | Ron Baalke | History | 2 | November 28th 03 09:21 AM |
Space Calendar - November 26, 2003 | Ron Baalke | Astronomy Misc | 1 | November 28th 03 09:21 AM |
NASA Selects UA 'Phoenix' Mission To Mars | Ron Baalke | Science | 0 | August 4th 03 10:48 PM |