Investigation 1 Image 37
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              Investigation 1 Image 37
            
          Alt text:
            A photo of a four different-sized models in a line from smallest to biggest. A ruler sits on either side of the line of balls to demonstrate the angular size of the balls. 
        Caption:
            The angular size of four balls are measured.
        Credit:
            Image courtesy of Peter Ashton, Simba Kol, Shakib Ahmed
        
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