Thanks for posting the article. Really helped! If you're still having trouble wrapping your mind around the shadowy part... Look at this image and imagine the

Thanks for posting the article. Really helped! If you're still having trouble wrapping your mind around the shadowy part... Look at this image and imagine the light source coming from behind instead: http://upload.wikimedia.org/wikipedia/commons/0/0e/Saturn_HST_2004-03-22.jpg http://upload.wikimedia.org/wikipedia/commons/0/0e/Saturn_HS...