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Fraser
2007-Feb-06, 01:54 AM
If they want to find life on Mars, future explorers will need to dig down deep under the surface. This is according to new research published by University College London Researcher Lewis Dartnell. ...

Read the full blog entry (http://www.universetoday.com/2007/02/05/martian-probes-need-to-dig-deeper/)

mpainesyd
2007-Feb-06, 10:20 AM
A promising place to look is under the ice caps or glaciers on Mars. Here the pressure of overlying ice might be sufficient to generate liquid water. Ice is also an excellent barrier for radiation.
If any microbe ldean Earth rocks (meteorites) have reached Mars then an ice cap/glacier would be the ideal place to touchdown.
http://users.tpg.com.au/horsts/transpermia_glaciers.html

mpainesyd
2007-Feb-06, 10:23 AM
Underneath the ice caps or glaciers on Mars would be the place to look. The pressure of overlying ice might generate liquid water. Also ice is an excellent barrier to most harmful radiation.
If microbe-laden earth rocks have reached Mars then an ice field would be the ideal place to land:
http://users.tpg.com.au/horsts/transpermia_glaciers.html

Grand_Lunar
2007-Feb-06, 12:55 PM
I can imagine future human explorers of Mars, looking life...

[singing] "Sixteen tons, whaddya get?"

barsuhn
2007-Feb-17, 12:48 AM
The figure caption to the image showing partially excavated sediments in crater Holden may be misleading. This picture was certainly not taken by the HIRISE camera onboard the Mars Reconnaissance Orbiter. It is much older. I used it in a lecture "Water on Mars ?" given at Fachhochschule Bielefeld in summer 2001. Unfortunately I cannot trace back where I found this image at that time in the internet. I think it is possible that it was taken by one of the Viking orbiters 1976/77. The color is a hint in that direction. The Viking Orbiters made some low resolution color picturs and the color of these low resolution images was then adopted to give a "natural" color to higher resolution black and white images. Indeed the coloring makes the scene more appealing and better to recognize details by an audience. As far as I know images by Mars Global Surveyor (starting its operation 1997) have never been presented with colors added (from somewhere else). I would appreciate somebody being able to trace back the origin of this image. All the best Jurgen

JonClarke
2007-Feb-17, 05:49 AM
The fan in "Holden north east" (now Eberswalde) crater was discovered by MOC and announced in this (http://www.msss.com/mars_images/moc/2003/11/13/)release. Viking imagery is far too low resolution to show its characteristic features.

A considerable number of MGS images have been released colourised, with synthesised colour, or sepia toned. See here (http://www.msss.com/mars_images/moc/themes/COLOR.html). The particular image in the link contained in the OP is on this (http://www.msss.com/mars_images/moc/dec00_seds/holden/) page. It too is a MOC image, not HiRISE, so the caption is in error. However HiRISE has imaged the Edereswalde delta, and can be seen here (http://hiroc.lpl.arizona.edu/images/PSP/PSP_001336_1560/color.html) - if you can handle half gigabyte images that is! I can't :(

Jon

barsuhn
2007-Feb-19, 12:51 AM
Thank you, Jon, for the link to the true source of the image discussed and the carefully collected links to related images. You are right, the image was taken by MOC onboard MGS and the kind the color had been added is also described on the link you gave
http://www.msss.com/mars_images/moc/dec00_seds/holden/
Apparently the scene shown is in Crater Holden, a small section in the south west of the crater floor, not in Holden NE (=Eberswalde). By the way, Eberswalde is a (very) small town in Germany; or is there an astronomer with this name? All the best Jurgen

JonClarke
2007-Feb-19, 06:56 AM
Thanks for the correction of the location.

Thanks too for the heads on on what Eberswalde is. Small to medium martian craters are often named after small towns on earth - Canberra for example (although with nearly 400,000 people I doubt it is really small!).

Jon