Difference between revisions of "April 5, 2004"

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=Three Cheers for Three As!=
 
=Three Cheers for Three As!=
 
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      <td width="50%"><h2 align="left">Three Cheers for Three As!</h2></td>
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  <td width="50%"><h2 align="right">April  5, 2004</h2></td>
 
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<td colspan="2"><div align="center">
<IMG SRC="images/LPOD-2004-04-05.jpeg" NAME="main_image" width="579" height="425" border="0"></div>
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[[File:LPOD-2004-04-05.jpeg|LPOD-2004-04-05.jpeg]]</div>
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      <td><div align="center" span class="main_sm">Image Credit:  <a class="one" HREF="mailto:Craig@astroimaging.com">Craig Zerbe</A></div></td>
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<td><div align="center" span class="main_sm">Image Credit:  [mailto:Craig@astroimaging.com Craig Zerbe]</div></td>
    </tr>
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<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>
 
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<p class="story" align="center"><b>Three Cheers for Three As! </b></p>
  <p class="story" align="center"><b>Three Cheers for Three As! </b></p>
+
<p class="story" align="left">        64 lunar craters have names than begin with the letter A. Three of them are shown here: Archimedes (diameter =  
 
+
83 km; depth = 2.1 km), Autolycus (39 km; 3.4 km) and Aristillus (55 km; 3.6 km). The latter two craters are  
  <p class="story" align="left">        64 lunar craters have names than begin with the letter A. Three of them are shown here: Archimedes (diameter =  
+
similar in morphology and in age. Note their radiating ejecta ridges crossing the maria - and high sun images  
        83 km; depth = 2.1 km), Autolycus (39 km; 3.4 km) and Aristillus (55 km; 3.6 km). The latter two craters are  
+
show a ray system for Aristillus and a much fainter one for Autolycus. According to the USGS  
        similar in morphology and in age. Note their radiating ejecta ridges crossing the maria - and high sun images  
+
[../02/LPOD-2004-02-23.htm system], both are Copernican, that is they are among the youngest large  
        show a ray system for Aristillus and a much fainter one for Autolycus. According to the USGS  
+
craters on the Moon. Unfortunately, we don't know their absolute ages. The Imbrium lavas they excavated into  
        [../02/LPOD-2004-02-23.htm system], both are Copernican, that is they are among the youngest large  
+
have an age of about 3.25 billion years. Clearly, Archimedes is older than that because it doesn't have ejecta
        craters on the Moon. Unfortunately, we don't know their absolute ages. The Imbrium lavas they excavated into  
+
on the Imbrium lavas - in fact, the lavas surround Archimedes. Rocks collected by Apollo 15 astronauts at nearby
        have an age of about 3.25 billion years. Clearly, Archimedes is older than that because it doesn't have ejecta
+
Hadley Rille show that significant shock events happened at 2.1 b.y. and 1.29 b.y. ago. Since there are no other
        on the Imbrium lavas - in fact, the lavas surround Archimedes. Rocks collected by Apollo 15 astronauts at nearby
+
young craters around, it is widely interpreted/speculated that Autolycus formed at 2.1 b.y. and Aristillus at
        Hadley Rille show that significant shock events happened at 2.1 b.y. and 1.29 b.y. ago. Since there are no other
+
1.29 b.y. If true, the 800 m.y. gap between those to craters is much larger than the time since creatures first
        young craters around, it is widely interpreted/speculated that Autolycus formed at 2.1 b.y. and Aristillus at
+
crawled out of the seas on Earth (550 m.y. ago). The Earth has changed immensely since then, the Moon, hardly at
        1.29 b.y. If true, the 800 m.y. gap between those to craters is much larger than the time since creatures first
+
all.
        crawled out of the seas on Earth (550 m.y. ago). The Earth has changed immensely since then, the Moon, hardly at
+
</p>
        all.
+
<blockquote>
</p>
+
<p align="right" class="story">&#8212; [mailto:tychocrater@yahoo.com Chuck Wood]</p>
  <blockquote>
+
</blockquote>  <p><b>Technical Details:</b><br>
    <p align="right" class="story">&#8212; [mailto:chuck@observingthesky.org Chuck Wood]</p>
+
Celestron 11 inch SCT mounted on a Losamady G11, using an Astrovid 2000 camera on Sept 20, 2000.
  </blockquote>  <p><b>Technical Details:</b><br>
+
More than 200+ stacked images. Two images were combined to make this picture. Mouse over for
 
+
feature names.
                      Celestron 11 inch SCT mounted on a Losamady G11, using an Astrovid 2000 camera on Sept 20, 2000.
+
</p>
                    More than 200+ stacked images. Two images were combined to make this picture. Mouse over for
+
<p class="story"><b>Related Links:</b><br>
                    feature names.
+
[http://www.astroimaging.com/main.htm Craig's Video Astronomy]<br>
</p>
+
[http://www.lpi.usra.edu/research/lunar_orbiter/images/img/iv_110_h1.jpg Lunar Orbiter 4 View]<br>
 
+
[http://www.lpi.usra.edu/research/cla/info/biii/ Full Moon View]
  <p class"story"><b>Related Links:</b><br>
+
</p>
                [http://www.astroimaging.com/main.htm Craig's Video Astronomy]<br>
+
<p class="story"> <b>Tomorrow's LPOD:</b> Fractured Frac</p>
[http://www.lpi.usra.edu/research/lunar_orbiter/images/img/iv_110_h1.jpg Lunar Orbiter 4 View]<br>
+
</td>
[http://www.lpi.usra.edu/research/cla/info/biii/ Full Moon View]
 
</p>
 
 
 
  <p class"story"> <b>Tomorrow's LPOD:</b> Fractured Frac</p>
 
 
 
  <p><img src="../../../MainPage/spacer.gif" width="640" height="1"></p>
 
  </td>
 
 
</tr>
 
</tr>
 
</table>
 
</table>
 
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<hr>
  <hr width="640">
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<p align="center" class="main_titles"><b>Author & Editor:</b><br>
  <p align="center" class="main_titles"><b>Author & Editor:</b><br>
+
[mailto:tychocrater@yahoo.com Charles A. Wood]</p>
      [mailto:chuck@observingthesky.org Charles A. Wood]</p>
+
<p align="center" class="main_titles"><b>Technical Consultant:</b><br>
      <p align="center" class="main_titles"><b>Technical Consultant:</b><br>
+
[mailto:anthony@perseus.gr Anthony Ayiomamitis]</p>
      [mailto:anthony@perseus.gr Anthony Ayiomamitis]</p>
+
<p align="center" class="main_titles"><b>A service of:</b><br>
      <p align="center" class="main_titles"><b>[mailto:webmaster@entropysponge.com Contact Webmaster]</b></p>
+
[http://www.observingthesky.org/ ObservingTheSky.Org]</p>
      <p align="center" class="main_titles"><b>A service of:</b><br>
+
<p align="center" class="main_titles"><b>Visit these other PODs:</b> <br>
      <a class="one" href="http://www.observingthesky.org/">ObservingTheSky.Org</a></p>
+
[http://antwrp.gsfc.nasa.gov/apod/astropix.html Astronomy] | [http://www.msss.com/ Mars] | [http://epod.usra.edu/ Earth]</p>
      <p align="center" class="main_titles"><b>Visit these other PODs:</b> <br>
+
<p>&nbsp;</p>
      <a class="one" href="http://antwrp.gsfc.nasa.gov/apod/astropix.html">Astronomy</a> | <a class="one" href="http://www.msss.com/">Mars</a> | <a class="one" href="http://epod.usra.edu/">Earth</a></p>
 
  <p>&nbsp;</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 18:18, 4 January 2015

Three Cheers for Three As!

LPOD-2004-04-05.jpeg
Image Credit: Craig Zerbe

Three Cheers for Three As!

64 lunar craters have names than begin with the letter A. Three of them are shown here: Archimedes (diameter = 83 km; depth = 2.1 km), Autolycus (39 km; 3.4 km) and Aristillus (55 km; 3.6 km). The latter two craters are similar in morphology and in age. Note their radiating ejecta ridges crossing the maria - and high sun images show a ray system for Aristillus and a much fainter one for Autolycus. According to the USGS [../02/LPOD-2004-02-23.htm system], both are Copernican, that is they are among the youngest large craters on the Moon. Unfortunately, we don't know their absolute ages. The Imbrium lavas they excavated into have an age of about 3.25 billion years. Clearly, Archimedes is older than that because it doesn't have ejecta on the Imbrium lavas - in fact, the lavas surround Archimedes. Rocks collected by Apollo 15 astronauts at nearby Hadley Rille show that significant shock events happened at 2.1 b.y. and 1.29 b.y. ago. Since there are no other young craters around, it is widely interpreted/speculated that Autolycus formed at 2.1 b.y. and Aristillus at 1.29 b.y. If true, the 800 m.y. gap between those to craters is much larger than the time since creatures first crawled out of the seas on Earth (550 m.y. ago). The Earth has changed immensely since then, the Moon, hardly at all.

Chuck Wood

Technical Details:

Celestron 11 inch SCT mounted on a Losamady G11, using an Astrovid 2000 camera on Sept 20, 2000. More than 200+ stacked images. Two images were combined to make this picture. Mouse over for feature names.

Related Links:
Craig's Video Astronomy
Lunar Orbiter 4 View
Full Moon View

Tomorrow's LPOD: Fractured Frac


Author & Editor:
Charles A. Wood

Technical Consultant:
Anthony Ayiomamitis

A service of:
ObservingTheSky.Org

Visit these other PODs:
Astronomy | Mars | Earth

 


COMMENTS?

Click on this icon File:PostIcon.jpg at the upper right to post a comment.