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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.   
      
                                 2021 November 16   
      
                               Geminids from Gemini   
                        Image Credit & Copyright: Wang Jin   
      
      Explanation: Where are all of these meteors coming from? In terms of   
      direction on the sky, the pointed answer is the constellation of   
      Gemini. That is why the major meteor shower in December is known as the   
      Geminids -- because shower meteors all appear to come from a radiant   
      toward Gemini. Three dimensionally, however, sand-sized debris expelled   
      from the unusual asteroid 3200 Phaethon follows a well-defined orbit   
      about our Sun, and the part of the orbit that approaches Earth is   
      superposed in front of the constellation of Gemini. Therefore, when   
      Earth crosses this orbit, the radiant point of falling debris appears   
      in Gemini. Featured here, a composite of many images taken during the   
      2020 Geminids meteor shower shows over 200 bright meteorss that   
      streaked through the sky during the night December 14. The best meteor   
      shower in November, the Leonids, peaks tonight and tomorrow.   
      Unfortunately, this year, dim meteors during the early-morning peak   
      will be hard to see against a sky lit by a bright gibbous moon. Still,   
      a few bright Leonid meteors should be visible each hour.   
      
                     Tomorrow's picture: double galaxy puzzler   
        __________________________________________________________________   
      
          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   
                                & Michigan Tech. U.   
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