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Originally posted by earth2
Looks like the shadows are bigger in one photo than the other (different sun position). So it could be there but it just caught the darkness, which made it appear to disapear.
Originally posted by Byrd
Mike's response was wonderful -- and accurate.
It's hard to judge what's there based on two different photos taken at different times. The height of the sun on the lunar plane can wash out shadows in a shallow crater, making it appear as though it's vanished... or show deep shadow on a previously washed-out crater.