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                           Astronomy Picture of the Day   
      
       Discover the cosmos! Each day a different image or photograph of our   
         fascinating universe is featured, along with a brief explanation   
                       written by a professional astronomer.   
      
                                  2024 December 1   
       There is no obvious picture. There is just a background with a single   
         color. This color, a type of off-white or beige, is called cosmic   
         latte. Please see the explanation for more detailed information.   
      
                  Cosmic Latte: The Average Color of the Universe   
              Image Color Credit: Karl Glazebrook & Ivan Baldry (JHU)   
      
      Explanation: What color is the universe? More precisely, if the entire   
      sky were smeared out, what color would the final mix be? This whimsical   
      question came up when trying to determine what stars are commonplace in   
      nearby galaxies. The answer, depicted here, is a conditionally   
      perceived shade of beige. In computer parlance: #FFF8E7. To determine   
      this, astronomers computationally averaged the light emitted by one of   
      the larger samples of galaxies analyzed: the 200,000 galaxies of the   
      2dF Galaxy Redshift Survey. The resulting cosmic spectrum has some   
      emission in all parts of the electromagnetic spectrum, but a single   
      perceived composite color. This color has become much less blue over   
      the past 10 billion years, indicating that redder stars are becoming   
      more prevalent. In a contest to better name the color, notable entries   
      included skyvory, univeige, and the winner: cosmic latte.   
      
                        Tomorrow's picture: galaxy of stars   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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