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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.   
      
                                    2022 May 15   
      
                                Colors of the Moon   
                  Image Credit & Copyright: Marcella Giulia Pace   
      
      Explanation: What color is the Moon? It depends on the night. Outside   
      of the Earth's atmosphere, the dark Moon, which shines by reflected   
      sunlight, appears a magnificently brown-tinged gray. Viewed from inside   
      the Earth's atmosphere, though, the moon can appear quite different.   
      The featured image highlights a collection of apparent colors of the   
      full moon documented by one astrophotographer over 10 years from   
      different locations across Italy. A red or yellow colored moon usually   
      indicates a moon seen near the horizon. There, some of the blue light   
      has been scattered away by a long path through the Earth's atmosphere,   
      sometimes laden with fine dust. A blue-colored moon is more rare and   
      can indicate a moon seen through an atmosphere carrying larger dust   
      particles. What created the purple moon is unclear -- it may be a   
      combination of several effects. The last image captures the total lunar   
      eclipse of 2018 July -- where the moon, in Earth's shadow, appeared a   
      faint red -- due to light refracted through air around the Earth. Today   
      there is not only another full moon but a total lunar eclipse visible   
      to observers in North and South America -- an occurrence that may lead   
      to some unexpected lunar colorings.   
      
                      Tomorrow's picture: alien castle rocks   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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                         A service of: ASD at NASA / GSFC   
                                & Michigan Tech. U.   
      
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