Difference between revisions of "October 30, 2010"
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=Arm-Waving= | =Arm-Waving= | ||
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| − | <em>image by [mailto:astrogarban@gmail.com Julio César Monje Bravo], Madrid, Spain</em><br /> | + | <em>image by [mailto:astrogarban@gmail.com" rel="nofollow Julio César Monje Bravo], Madrid, Spain</em><br /> |
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The Altai Scarp is one of the most dramatic basin rings on the Moon, casting long shadows in the lunar afternoon. But as Julio's image shows, the scarp is not continuous, taking an abrupt dip along its southwest edge. Two long shadows bracket a place where the scarp basically disappears. The broad flat plain to the left of the gap is the floor of an old battered crater, Rothman G. Did G form before or after the scarp? If afterward, that could account for the lowering of the scarp wall - the expanding shockwave from the crater-forming impact destroyed the basin rim. But the debris of the collapsed scarp isn't visible to the right. This area is covered by lava flows that perhaps covered the debris. If the crater formed first, the subsequent formation of the scarp would have cut right through a low spot - the crater rim and floor, so that the scarp would be lower than expected. This seems like a more reasonable explanation, but it is really arm-waving. That is what it is called when interpretation gets ahead of facts. <br /> | The Altai Scarp is one of the most dramatic basin rings on the Moon, casting long shadows in the lunar afternoon. But as Julio's image shows, the scarp is not continuous, taking an abrupt dip along its southwest edge. Two long shadows bracket a place where the scarp basically disappears. The broad flat plain to the left of the gap is the floor of an old battered crater, Rothman G. Did G form before or after the scarp? If afterward, that could account for the lowering of the scarp wall - the expanding shockwave from the crater-forming impact destroyed the basin rim. But the debris of the collapsed scarp isn't visible to the right. This area is covered by lava flows that perhaps covered the debris. If the crater formed first, the subsequent formation of the scarp would have cut right through a low spot - the crater rim and floor, so that the scarp would be lower than expected. This seems like a more reasonable explanation, but it is really arm-waving. That is what it is called when interpretation gets ahead of facts. <br /> | ||
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| − | <em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /> | + | <em>[mailto:tychocrater@yahoo.com" rel="nofollow Chuck Wood]</em><br /> |
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<strong>Technical Details</strong><br /> | <strong>Technical Details</strong><br /> | ||
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<strong>Related Links</strong><br /> | <strong>Related Links</strong><br /> | ||
Rükl plate [http://the-moon.wikispaces.com/R%C3%BCkl+57 57]<br /> | Rükl plate [http://the-moon.wikispaces.com/R%C3%BCkl+57 57]<br /> | ||
| − | Julio's [http://www.nocturlabio.com/ website]<br /> | + | Julio's [http://www.nocturlabio.com/" rel="nofollow website]<br /> |
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| − | <div>You can support LPOD when you buy any book from Amazon thru [http://www.lpod.org/?page_id=591 LPOD!]<br /> | + | <div>You can support LPOD when you buy any book from Amazon thru [http://www.lpod.org/?page_id=591" rel="nofollow LPOD!]<br /> |
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===COMMENTS?=== | ===COMMENTS?=== | ||
Click on this icon [[image:PostIcon.jpg]] at the upper right to post a comment. | Click on this icon [[image:PostIcon.jpg]] at the upper right to post a comment. | ||
Revision as of 22:08, 4 January 2015
Arm-Waving
image by " rel="nofollow Julio César Monje Bravo, Madrid, Spain
The Altai Scarp is one of the most dramatic basin rings on the Moon, casting long shadows in the lunar afternoon. But as Julio's image shows, the scarp is not continuous, taking an abrupt dip along its southwest edge. Two long shadows bracket a place where the scarp basically disappears. The broad flat plain to the left of the gap is the floor of an old battered crater, Rothman G. Did G form before or after the scarp? If afterward, that could account for the lowering of the scarp wall - the expanding shockwave from the crater-forming impact destroyed the basin rim. But the debris of the collapsed scarp isn't visible to the right. This area is covered by lava flows that perhaps covered the debris. If the crater formed first, the subsequent formation of the scarp would have cut right through a low spot - the crater rim and floor, so that the scarp would be lower than expected. This seems like a more reasonable explanation, but it is really arm-waving. That is what it is called when interpretation gets ahead of facts.
" rel="nofollow Chuck Wood
Technical Details
31 July 2010, 02:18 GMT (04:18 Local Time) from El Tiemblo, Avila, Spain. Guan-Sheng GS600 Newtonian 200mm f/4 telescope + Siebert Optics 3,5X telecentric lens (effective focal lens approx. 2.800mm.) + Imaging Source DMK31AU03.AS camera with Astronomik Planet IR Pro 742 filter. Processing: stacked image with AviStack2, post-processed with AviStack2 wavelets and unsharp mask of Photoshop CS4.
Related Links
Rükl plate 57
Julio's " rel="nofollow website
COMMENTS?
Click on this icon File:PostIcon.jpg at the upper right to post a comment.
