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   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.   
      
                                    2025 June 3   
      A starfield is seen over water, clouds, and the lights of a city below.   
       The starfield is oddly not black, but shows a repeating assortment of   
       transparent colors diagonally from the lower left to the upper right.   
             Please see the explanation for more detailed information.   
      
                          Rainbow Airglow over the Azores   
        Image Credit & Copyright: Miguel Claro (TWAN); Rollover Annotation:   
                                   Judy Schmidt   
      
      Explanation: Why would the sky glow like a giant repeating rainbow?   
      Airglow. Now, air glows all of the time, but it is usually hard to see.   
      A disturbance however -- like an approaching storm -- may cause   
      noticeable rippling in the Earth's atmosphere. These gravity waves are   
      oscillations in air analogous to those created when a rock is thrown in   
      calm water. The long-duration exposure nearly along the vertical walls   
      of airglow likely made the undulating structure particularly visible.   
      OK, but where do the colors originate? The deep red glow likely   
      originates from OH molecules about 87 kilometers high, excited by   
      ultraviolet light from the Sun. The orange and green airglow is likely   
      caused by sodium and oxygen atoms slightly higher up. The featured   
      image was captured during a climb up Mount Pico in the Azores of   
      Portugal. Ground lights originate from the island of Faial in the   
      Atlantic Ocean. A spectacular sky is visible through this banded   
      airglow, with the central band of our Milky Way Galaxy running up the   
      image center, and M31, the Andromeda Galaxy, visible near the top left.   
      
            APOD Turns 30!: Free Public Lecture in Anchorage on June 11   
                         Tomorrow's picture: Rubin begins   
        __________________________________________________________________   
      
          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.   
      
   --- BBBS/Li6 v4.10 Toy-7   
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