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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 March 20   
      
                           M1: The Expanding Crab Nebula   
                     Video Credit & Copyright: Detlef Hartmann   
      
      Explanation: Are your eyes good enough to see the Crab Nebula expand?   
      The Crab Nebula is cataloged as M1, the first on Charles Messier's   
      famous list of things which are not comets. In fact, the Crab is now   
      known to be a supernova remnant, an expanding cloud of debris from the   
      explosion of a massive star. The violent birth of the Crab was   
      witnessed by astronomers in the year 1054. Roughly 10 light-years   
      across today, the nebula is still expanding at a rate of over 1,000   
      kilometers per second. Over the past decade, its expansion has been   
      documented in this stunning time-lapse movie. In each year from 2008 to   
      2022, an image was produced with the same telescope and camera from a   
      remote observatory in Austria. The sharp, processed frames even reveal   
      the dynamic energetic emission surrounding the rapidly spinning pulsar   
      at the center. The Crab Nebula lies about 6,500 light-years away toward   
      the constellation of the Bull (Taurus).   
      
                        Tomorrow's picture: beautiful dust   
        __________________________________________________________________   
      
          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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