I am sure you have your fair share of nutters on this forum, and you can pass me off as this if you choose to. However, this is a perfectly reasonable question to people who might know - I have been wondering about this structure on the moon, shown in an official Clementine Mission photo. http://www.cmf.nrl.navy.mil/cgi-bin/clementine/clib/multires.pl?clickres=5&ox=0&oy=0&res=0&size=768&latitude=-2&longitude=311&submit=Use+Lat%252FLong&%20sensor=UVVIS&filter=415_nm" [Broken] Can anyone shed some light on what it might be please? As you can see, at 1pixel=1Kilometre it must be a massive structure, kilometres wide and long. The only explanation I have had is that it must be an anomoly on the digital image, but it seems too detailed for that.