DIR xkcd - A Webcomic of Romance, Sarcasm, Math and Language.
   DIR Floodgap Gopher Fun and Games
        
       xkcd - A Webcomic - Black Holes vs Regular Holes (2844)
        
       Image:
       black_holes_vs_regular_holes.png
        
       Created by the collapse of: [massive stars] [Florida limestone
       bedrock]
        
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