LROC news and images |
LROC news and images |
Guest_Zvezdichko_* |
Jun 19 2009, 11:25 AM
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#1
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Guests |
I know it may be too early for such a thread, but an announcement has to be made.
The official website of the LROC camera is: http://lroc.sese.asu.edu/ A brief description plus status is available here: http://www.msss.com/lro/lroc/index.html |
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Aug 9 2009, 05:03 PM
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#2
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Member Group: Members Posts: 550 Joined: 1-May 06 From: Scotland (Ecosse, Escocia) Member No.: 759 |
This sample is just another example of rock movement. We can clearly seen the trails. But what could have caused this? The Moon is a dead body for millions of years. Don't forget that on Earth we have incremental boulder creep downslope, as well as rolling boulders. These are seen as "ploughing boulders" in mountain areas, which leave a trench behind them in the soil as they move downhill. In Scotland at least, this thought to be the result of freezing and thawing effects since the end of the last Ice Age, circa 10,000 years ago. Scottish mountain boulder movement On the Moon, perhaps thermal expansion and contraction of the moving rock could offer a mechanism. As the rock warms up in the lunar day, it will be easier to expand downhill where movement is less constrained by the regolith slope, than uphill. The net effect over millions of years could be the apparent movement and tracks we now see - a much slower effect than the Earth mountain analogy, but with a similar outcome. |
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