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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.   
      
                                  2021 December 1   
      
                             A Blue-Banded Blood Moon   
                              Image Credit: Angel Yu   
      
      Explanation: What causes a blue band to cross the Moon during a lunar   
      eclipse? The blue band is real but usually quite hard to see. The   
      featured HDR image of last week's lunar eclipse, however -- taken from   
      Yancheng, China -- has been digitally processed to equalize the Moon's   
      brightness and exaggerate the colors. The gray color of the bottom   
      right is the Moon's natural color, directly illuminated by sunlight.   
      The upper left part of the Moon is not directly lit by the Sun since it   
      is being eclipsed -- it in the Earth's shadow. It is faintly lit,   
      though, by sunlight that has passed deep through Earth's atmosphere.   
      This part of the Moon is red -- and called a blood Moon -- for the same   
      reason that Earth's sunsets are red: because air scatters away more   
      blue light than red. The unusual blue band is different -- its color is   
      created by sunlight that has passed high through Earth's atmosphere,   
      where red light is better absorbed by ozone than blue. A total eclipse   
      of the Sun will occur tomorrow but, unfortunately, totality be visible   
      only near the Earth's South Pole.   
      
                     Almost Hyperspace: Random APOD Generator   
                   Tomorrow's picture: small galaxy, local group   
        __________________________________________________________________   
      
          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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