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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 July 8   
          A cluster of bright blue stars is seen near the bottom of this   
         starfield. Nebula around the stars is blue near the stars but red   
       elsewhere. Please see the explanation for more detailed information.   
      
                           The Pleiades in Red and Blue   
      Image Credit & Copyright: Ogetay Kayali (Michigan Tech U.) Text: Ogetay   
                             Kayali (Michigan Tech U.)   
      
      Explanation: If you have looked at the sky and seen a group of stars   
      about the size of the full Moon, that's the Pleiades (M45). Perhaps the   
      most famous star cluster in the sky, its brightest stars can be seen   
      even from the light-polluted cities. But your unaided eye can also see   
      its nebulosity -- the gas and dust surrounding it -- under dark skies.   
      However, telescopes can catch even more. The bright blue stars of the   
      Pleiades, also known as the Seven Sisters, light up their surrounding   
      dust, causing it to appear a diffuse blue that can only be seen under   
      long exposures. But that's not all. The cosmic dust appears to stretch   
      upward like ethereal arms. And the entire structure is surrounded by a   
      reddish glow from the most abundant element in the universe: hydrogen.   
      The featured image is composed of nearly 25 hours of exposure and was   
      captured last year from Starfront Observatory, in Texas, USA   
      
                   Explore Your Universe: Random APOD Generator   
                          Tomorrow's picture: open space   
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          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.   
      
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