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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 13   
         A deep starfield features an orange planet Mars on the left and a   
       green-headed Comet ZTF on the right. In the foreground is a landscape   
        that includes the top of a famous mountain known as the Matterhorn.   
             Please see the explanation for more detailed information.   
      
                                Comet ZTF and Mars   
                      Image Credit & Copyright: Donato Lioce   
      
      Explanation: No, Comet ZTF is not going to hit Mars. Nicknamed the   
      Green Comet for its bright green coma, C/2022 E3 (ZTF) did, however,   
      pass almost in front of the much-more distant planet a few days ago,   
      very near in time to when the featured picture was taken. The two sky   
      icons were here captured behind a famous Earth icon -- the Matterhorn,   
      a mountain in the Italian Alps with a picturesque peak. Both the   
      foreground and background images were taken on the same evening by the   
      same camera and from the same location. The comet's white dust tail is   
      visible to the right of the green coma, while the light blue ion tail   
      trails towards the top of the image. Orange Mars is well in front of   
      the numerous background stars as well as the dark nebula Barnard 22 to   
      its lower right. Although Mars remains visible in the evening sky for   
      the next few months, Comet ZTF has already begun to fade as it returns   
      to the outer Solar System.   
      
                  Comet ZTF Gallery: Notable Submissions to APOD   
                        Tomorrow's picture: heart and soul   
        __________________________________________________________________   
      
          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.   
      
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