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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.   
      
                                 2023 February 21   
      A comet with a green head and extended tails is seen above a high water   
      fall. In the night sky field just above the falls, an orange dot -- the   
      star Kochab -- is visible. Please see the explanation for more detailed   
                                   information.   
      
                           Comet ZTF over Yosemite Falls   
                      Image Credit & Copyright: Tara Mostofi   
      
      Explanation: They are both falling. The water in Yosemite Falls,   
      California, USA, is falling toward the Earth. Comet ZTF is falling   
      toward the Sun. This double cosmic cascade was captured late last month   
      as fading Comet C/2022 E3 (ZTF) had just passed its closest to planet   
      Earth. The orange star just over the falls is Kochab. With the   
      exception of a brief encounter with a black bear, the featured image   
      was a well-planned composite of a moonlit-foreground and long-duration   
      background exposures - all designed to reconstruct a deep version of an   
      actual single sight. Although Comet ZTF is now fading as it glides back   
      to the outer Solar System, its path is determined by gravity and so it   
      can be considered to still be falling toward the Sun -- but backwards.   
      
                  Comet ZTF Gallery: Notable Submissions to APOD   
                    Tomorrow's picture: a surprisingly busy sun   
        __________________________________________________________________   
      
          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,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
   --- BBBS/Li6 v4.10 Toy-6   
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