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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 September 29   
      A starfield is shown that has two short streaks running diagonally. At   
      closer inspection, they are two comets both with white-green heads and   
      white tails. Please see the explanation for more detailed information.   
      
                           Two Camera Comets in One Sky   
                    Image Credit & Copyright: Luc Perrot (TWAN)   
      
      Explanation: It may look like these comets are racing, but they are   
      not. Comets C/2025 K1 ATLAS (left) and C/2025 R2 SWAN (right) appeared   
      near each other by chance last week in the featured image taken from   
      France's Reunion Island in the southern Indian Ocean. Fainter Comet   
      ATLAS is approaching our Sun and will reach its closest approach in   
      early October when it is also expected to be its brightest -- although   
      still only likely visible with long exposures on a camera. The brighter   
      comet, nicknamed SWAN25B, is now headed away from our Sun, although its   
      closest approach to Earth is expected in mid-October, when optimistic   
      estimates have it becoming bright enough to see with the unaided eye.   
      Each comet has a greenish coma of expelled gas and an ion tail pointing   
      away from the Sun.   
      
                          Growing Gallery: Comet SWAN25B   
                     Tomorrow's picture: a third camera comet   
        __________________________________________________________________   
      
          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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