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I'm not one for conspiracy theories, and as big a sci-fi nerd as I am, I firmly do NOT believe that aliens have visited Earth (unless they are us, which is another discussion altogether). But, this story is beginning to circulate in halfway legitimate circles, so here you go: an object that does not look like a natural formation or crater has been spotted on the surface of the moon, leading to theories, some wilder than others, about what it might be. Pretty unusual pics, unless they turn out later to be fake. Check 'em out HERE, HERE and HERE.