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       xkcd - A Webcomic - Comet Visitor (2524)
        
       Image:
 (PNG) comet_visitor.png
        
       It's a myth that the Great Wall of China is the only human-made
       structure visible from space--there are LOTS of structures for us
       to feel self-conscious about!
        
       Comics reproduced from www.xkcd.com under license.
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