Astronomy Picture of the Day: A Hole in Mars Close Up


	Astronomy Picture of the Day: A Hole in Mars Close Up

travislaborde

9-28-2007 8:40 AM

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tags:

images

travislaborde says:

wow

3 Comments |

Add a Comment

9-28-2007 1:50 PM

jstates1

Wish I could be there.

9-28-2007 2:00 PM

dorine

Wonder where it ends.

9-28-2007 2:23 PM

SteveJohnSteele

knock, knock - anybody home ?

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://www.clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/ffb673a1-5a71-4183-9d06-5678194a96d6/E8ED32C4-739D-4378-93B8-5AC3E955B23C/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://antwrp.gsfc.nasa.gov/apod/astropix.html" href="http://antwrp.gsfc.nasa.gov/apod/astropix.html" style="font-size: 11px;">antwrp.gsfc.nasa.gov</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://antwrp.gsfc.nasa.gov/apod/astropix.html"><H1> Astronomy Picture of the Day </H1></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://antwrp.gsfc.nasa.gov/apod/astropix.html"><div align="center"><img src="http://content7.clipmarks.com/blog_cache/antwrp.gsfc.nasa.gov/img/3B98B7BD-76FD-4B0A-A1D4-77001FD2454F" alt="See Explanation.  Clicking on the picture will download
 the highest resolution version available." /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://antwrp.gsfc.nasa.gov/apod/astropix.html"><B> A Hole in Mars Close Up</B></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://antwrp.gsfc.nasa.gov/apod/astropix.html"><P>
<B> Explanation: </B>
<A href="http://hirise.lpl.arizona.edu/PSP_004847_1745">In a close-up</A>
from the
<A href="http://hirise.lpl.arizona.edu/index.php">HiRISE</A> instrument
onboard the Mars Reconnaissance Orbiter,
this mysterious dark pit, about 150 meters across,
lies on the north slope of ancient
<A href="http://www.lukew.com/marsgeo/index.html">martian</A> volcano
<A href="http://photojournal.jpl.nasa.gov/catalog/PIA02337">Arsia Mons</A>.
Lacking raised rims and other impact crater characteristics, this pit
<A href="http://mars.jpl.nasa.gov/odyssey/newsroom/pressreleases/
20070921a.html">and others like it</A> were originally
identified in visible
light and infrared images from the Mars Odyssey and
Mars Global Surveyor spacecraft.
While the visible light images showed only
<A href="http://antwrp.gsfc.nasa.gov/apod/ap070528.html">darkness within</A>, infrared
<A href="http://www.nasa.gov/mission_pages/odyssey/images/
cave4.html">thermal signatures</A> indicated that the
openings penetrated deep under the martian surface and perhaps were
skylights to underground caverns.
In this later image, the pit wall is partially
illuminated by sunlight and seen to be nearly vertical,
though the bottom, at least 78 meters below, is still not visible.  
The dark martian pits are thought to
be related to
<A href="http://hvo.wr.usgs.gov/gallery/kilauea/erz/
devilsthroat.html">collapse pits</A> in the lava flow,
<A href="http://hvo.wr.usgs.gov/gallery/kilauea/erz/
upper/30424305-044_large.jpg">similar</A> to Hawaiian volcano
<A href="http://volcanoes.usgs.gov/Products/Pglossary/
PitCrater.html">pit craters</A>.
</P></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/E8ED32C4-739D-4378-93B8-5AC3E955B23C/blog/" title="blog or email this clip"><img src="http://content8.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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