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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.   
      
                                  2022 August 21   
      
                      The Spinning Pulsar of the Crab Nebula   
        Image Credit: NASA: X-ray: Chandra (CXC), Optical: Hubble (STScI),   
                          Infrared: Spitzer (JPL-Caltech)   
      
      Explanation: At the core of the Crab Nebula lies a city-sized,   
      magnetized neutron star spinning 30 times a second. Known as the Crab   
      Pulsar, it is the bright spot in the center of the gaseous swirl at the   
      nebula's core. About twelve light-years across, the spectacular picture   
      frames the glowing gas, cavities and swirling filaments near the Crab   
      Nebula's center. The featured picture combines visible light from the   
      Hubble Space Telescope in purple, X-ray light from the Chandra X-ray   
      Observatory in blue, and infrared light from the Spitzer Space   
      Telescope in red. Like a cosmic dynamo the Crab pulsar powers the   
      emission from the nebula, driving a shock wave through surrounding   
      material and accelerating the spiraling electrons. With more mass than   
      the Sun and the density of an atomic nucleus,the spinning pulsar is the   
      collapsed core of a massive star that exploded. The outer parts of the   
      Crab Nebula are the expanding remnants of the star's component gasses.   
      The supernova explosion was witnessed on planet Earth in the year 1054.   
      
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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