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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.   
      
                                   2025 March 25   
       A developing total lunar eclipse is shown in three frames. At the top   
        part of the uneclipsed Moon is visible with a distinctive blue band   
        separating it from the rest of the reddened Moon. The middle frame   
       shows a mostly reddened Moon with a the blue band just visible on the   
      upper right, while the lowest frame shows an entirely eclipsed moon all   
         in red. Please see the explanation for more detailed information.   
      
                             A Blue Banded Blood Moon   
                       Image Credit & Copyright: Zixiong Jin   
      
      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   
      Norman, Oklahoma (USA) -- has been digitally processed to exaggerate   
      the colors. The gray color on the upper right of the top lunar image is   
      the Moon's natural color, directly illuminated by sunlight. The lower   
      parts of the Moon on all three images are not directly lit by the Sun   
      since it is being eclipsed -- it is 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 purple-blue band visible on   
      the upper right of the top and middle images is different -- its color   
      is augmented by sunlight that has passed high through Earth's   
      atmosphere, where red light is better absorbed by ozone than blue.   
      
        Celestial Surprise: What picture did APOD feature on your birthday?   
                                    (post 1995)   
                         Tomorrow's picture: star factory   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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                                & Michigan Tech. U.   
      
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