The Astronomy Picture of the Day for May 28, 2007 is of the one of the
cave entrance recently discovered on Mars:
http://antwrp.gsfc.nasa.gov/apod/ap070528.html
Like typical Earth karst, you'll notice the usual lack of surface
drainage, and you'll also see the numerous other smaller depressions in
the area. :-)
I wonder if a meteorite could have caused the collapse to occur.
Lee Skinner
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