Difference between revisions of "March 26, 2005"
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| − | + | <td width="50%"><h2><nobr>A Long Crater</nobr></h2></td> | |
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| − | + | <img src="archive/2005/03/images/LPOD-2005-03-26.jpeg" border="0"> | |
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| − | + | <tr><td><div align="center" class="main_sm">Image Credit: [mailto:starman2@charter.net Wes Higgins]</p> | |
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<br> | <br> | ||
<table class="story" border="0" bgcolor="#FFFFFF" width="90%" cellpadding="10" align="center"><tr><td> | <table class="story" border="0" bgcolor="#FFFFFF" width="90%" cellpadding="10" align="center"><tr><td> | ||
| − | + | <p align="center"><b>A Long Crater</b></p> | |
| − | + | <p align="left">Schiller is not the largest crater on the Moon but it is probably the least circular. Its length of 180 km and width of 70 km implies that it has had an unusual origin, as discussed in a previous [http://www.lpod.org/LPOD-2004-11-12.htm LPOD.] In this high resolution image we can examine more closely Schillers interior and surroundings. I placed the image with south up to better show the hints of downslope movement on the walls. The walls also show a smoothed-over remnant of a single large terrace. The smooth floor is broken by a few dozen small crater pits, those in clusters are probably secondaries. Smooth material also fills the floors of many nearby craters. As near [http://www.lpod.org/LPOD-2005-03-25.htm Pitiscus] this smooth material looks like mare lava, but lacks the dark color at high sun that is caused by the iron and magnesium in mare basalts. The prevailing theory is that light smooth plains are fluidized ejecta widely dispersed by the formation of the Orientale basin. The problem with this explanation is that counts of craters on Schillers smooth floor implies that that material is 100 million years younger than the Orientale formation. Another possibility is that the smooth material is normal basalt, veneered with bright dust from later impacts. Such cryptomaria exist nearby, but small craters in Schiller dont have dark haloes from underlying basalt, so that explanation doesnt work either. As I said yesterday, some - maybe all - light-hued smooth plains may be an unsampled type of volcanism, but so far there is no proof. | |
</p> | </p> | ||
| − | + | <blockquote><p align="right">— [mailto:tychocrater@yahoo.com Chuck Wood]</blockquote> | |
<p align="left"><p><b>Technical Details:</b><br> | <p align="left"><p><b>Technical Details:</b><br> | ||
18" Starmaster Newtonian Reflector + DMK-21F04 Firewire Camera, 30FPS</p> | 18" Starmaster Newtonian Reflector + DMK-21F04 Firewire Camera, 30FPS</p> | ||
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[http://www.higginsandsons.com/astro/ Wes' Web Site] | [http://www.higginsandsons.com/astro/ Wes' Web Site] | ||
<p align="left"><b>Tomorrow's LPOD: </b> Another Surprise!</p> | <p align="left"><b>Tomorrow's LPOD: </b> Another Surprise!</p> | ||
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</table> | </table> | ||
<br> | <br> | ||
<table width="100%" border="0" cellspacing="2" cellpadding="4"> | <table width="100%" border="0" cellspacing="2" cellpadding="4"> | ||
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| − | + | <td><hr></td> | |
| − | + | </tr> | |
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| − | + | <p align="center" class="main_titles"><b>Author & Editor:</b><br> | |
| − | + | [mailto:tychocrater@yahoo.com Charles A. Wood]</p> | |
| − | + | <p align="center" class="main_titles"><b>Technical Consultant:</b><br> | |
| − | + | [mailto:anthony@perseus.gr Anthony Ayiomamitis]</p> | |
| − | + | <p align="center" class="main_titles"><b>Contact Translator:</b><br> | |
| − | + | [mailto:pablolonnie@yahoo.com.mx" class="one Pablo Lonnie Pacheco Railey] (Es)<br> | |
| − | + | [mailto:chlegrand@free.fr" class="one Christian Legrand] (Fr)</p> | |
| − | + | <p align="center" class="main_titles"><b>[mailto:webuser@observingthesky.org Contact Webmaster]</b></p> | |
| − | + | <p align="center" class="main_titles"><b>A service of:</b><br> | |
| − | + | [http://www.observingthesky.org/" class="one ObservingTheSky.Org]</p> | |
| − | + | <p align="center" class="main_titles"><b>Visit these other PODs:</b> <br> | |
| − | + | [http://antwrp.gsfc.nasa.gov/apod/astropix.html" class="one Astronomy] | [http://www.msss.com/" class="one Mars] | [http://epod.usra.edu/" class="one Earth]</p> | |
| − | + | </td></tr> | |
</table> | </table> | ||
<p> </p> | <p> </p> | ||
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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 18:30, 4 January 2015
A Long Crater
<nobr>A Long Crater</nobr> |
<img src="archive/2005/03/images/LPOD-2005-03-26.jpeg" border="0"> |
Image Credit: Wes Higgins
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A Long Crater Schiller is not the largest crater on the Moon but it is probably the least circular. Its length of 180 km and width of 70 km implies that it has had an unusual origin, as discussed in a previous LPOD. In this high resolution image we can examine more closely Schillers interior and surroundings. I placed the image with south up to better show the hints of downslope movement on the walls. The walls also show a smoothed-over remnant of a single large terrace. The smooth floor is broken by a few dozen small crater pits, those in clusters are probably secondaries. Smooth material also fills the floors of many nearby craters. As near Pitiscus this smooth material looks like mare lava, but lacks the dark color at high sun that is caused by the iron and magnesium in mare basalts. The prevailing theory is that light smooth plains are fluidized ejecta widely dispersed by the formation of the Orientale basin. The problem with this explanation is that counts of craters on Schillers smooth floor implies that that material is 100 million years younger than the Orientale formation. Another possibility is that the smooth material is normal basalt, veneered with bright dust from later impacts. Such cryptomaria exist nearby, but small craters in Schiller dont have dark haloes from underlying basalt, so that explanation doesnt work either. As I said yesterday, some - maybe all - light-hued smooth plains may be an unsampled type of volcanism, but so far there is no proof. Technical Details: Related Links: Tomorrow's LPOD: Another Surprise! |
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Author & Editor: Technical Consultant: Contact Translator: A service of: Visit these other PODs: |
COMMENTS?
Click on this icon File:PostIcon.jpg at the upper right to post a comment.
