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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 November 21   
      
                        3I/ATLAS: A View from Planet Earth   
                    Image Credit & Copyright: Rolando Ligustri   
      
      Explanation: Now outbound after its perihelion or closest approach to   
      the Sun on October 29, Comet 3I/ATLAS is only the third known   
      interstellar object to pass through our fair Solar System. Its greenish   
      coma and faint tails are seen against a background of stars in the   
      constellation Virgo in this view from planet Earth, recorded with a   
      small telescope on November 14. But this interstellar interloper is the   
      subject of an on-going, unprecedented Solar System-wide observing   
      campaign involving spacecraft and space telescopes from Earth orbit to   
      the surface of Mars and beyond. And while the comet from another   
      star-system has recently grown brighter, you'll still need a telescope   
      if you want to see 3I/ATLAS from planet Earth. It's now above the   
      horizon in November morning skies and will make its closest approach to   
      Earth, a comfortable 270 million kilometers distant, around December   
      19.   
      
                  Tomorrow's picture: Dione and Rhea Ring Transit   
        __________________________________________________________________   
      
          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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