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   TZUTC: -0800   
   CHRS: LATIN-1 2   
                           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.   
      
                                   2023 March 8   
       A flattened map of the Earth is shown illuminated only by how bright   
          the night sky is. Please see the explanation for more detailed   
                                   information.   
      
                          Artificial Night Sky Brightness   
         Image Credit: Data: JPSS Satellites; Processing: David J. Lorenz   
      
      Explanation: Where have all the dim stars gone? From many places on the   
      Earth including major cities, the night sky has been reduced from a   
      fascinating display of thousands of stars to a diffuse glow through   
      which only a few stars are visible. The featured map indicates the   
      relative amount of light pollution that occurs across the Earth. The   
      cause of the pollution is artificial light reflecting off molecules and   
      aerosols in the atmosphere. Parts of the Eastern United States and   
      Western Europe colored red, for example, have an artificial night sky   
      glow over ten times that of the natural sky. In any area marked orange   
      or red, the central band of our Milky Way Galaxy is no longer visible.   
      The International Dark Sky Association suggests common types of   
      fixtures that provide relatively little amounts of light pollution.   
      
              Light Up Your Internal Night Sky: Random APOD Generator   
                          Tomorrow's picture: open space   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
                   NASA Web Privacy Policy and Important Notices   
                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
   --- BBBS/Li6 v4.10 Toy-6   
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