Giant holes open into Martian caves


	Giant holes open into Martian caves

johnlam

6-4-2007 12:56 PM

468 views

tags:

mars, astronomy, images, pictures, nasa, planets, camera

johnlam says:

Though the article never addresses what makes the holes nearly perfectly round, it does suggest an answer. Sinkholes http://en.wikipedia.org/wiki/Sinkhole often do appear round. I would be more surprised if they appeared square, triangular or some other engineered shape.

Credit to http://nibot.livejournal.com/589189.html for this article tip.

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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://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/2eeb64d0-df9d-49d2-890d-7722fc37ab62/54228D8B-B815-486D-B1F8-8A2D03374A36/" 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://planetary.org/blog/article/00000984/" href="http://planetary.org/blog/article/00000984/" style="font-size: 11px;">planetary.org</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://planetary.org/blog/article/00000984/"><div align="center"><img src="http://content8.clipmarks.com/blog_cache/planetary.org/img/B3894ED4-F72F-450F-8F55-B0283CFFD45B" alt="Cave entrance on the flank of Arsia Mons" /></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://planetary.org/blog/article/00000984/"><div align="center"><img src="http://content9.clipmarks.com/blog_cache/planetary.org/img/D29A3628-CAED-4B2D-810B-DAF6CACBDA21" alt="Cave entrance on the flank of Arsia Mons" /></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://planetary.org/blog/article/00000984/">This black spot is one of seven possible entrances to subterranean caves identified on Mars by Glen Cushing, <A target="caves" href="http://astrogeology.usgs.gov/About/People/TimTitus/">Tim Titus</A>, <A target="caves" href="http://www.caveexplorer.org/vitae.php">J. Judson Wynne</A> and <A target="caves" href="http://www.mars.asu.edu/christensen/">Phil Christensen</A> in <A target="caves" href="http://www.lpi.usra.edu/meetings/lpsc2007/pdf/1371.pdf">a paper they presented at the Lunar and Planetary Science Conference in March</A></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://planetary.org/blog/article/00000984/">The hope for the HiRISE images was that we could see some details from inside the hole.</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://planetary.org/blog/article/00000984/">HiRISE is a very sensitive instrument, and Mars' dusty atmosphere scatters quite a bit of light around, so there is certainly light entering that cave hole and bouncing around the interior.  But it seems that the cave is so big and so deep that almost none of the light that enters the cave comes out.</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/54228D8B-B815-486D-B1F8-8A2D03374A36/blog/" title="blog or email this clip"><img src="http://content6.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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