On 8/18/2011 11:38 AM, Tenzin Beck wrote:
Not likely a meteor-- it's too conical, and has no sign of a rim or
nearby ejecta. Always hard to judge scale and angles in these kinds of
images... anyway, my guess is that the underlying lava tube had a
partial collapse on its own, causing the sand/regolith to funnel in.
-Tenzin
At this point, I wouldn't rule out either theory. A small meteor
hitting a deep layer of sand over a lava tube may have been sufficient
force to cause a collapse. The original rim and ejecta may have been
much smaller, and thus swallowed along with the sand falling into the
opening.
Lee Skinner
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