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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 June 1   
      
                              Recycling Cassiopeia A   
            Image Credit: X-ray - NASA, CXC, SAO; Optical - NASA,STScI   
      
      Explanation: Massive stars in our Milky Way Galaxy live spectacular   
      lives. Collapsing from vast cosmic clouds, their nuclear furnaces   
      ignite and create heavy elements in their cores. After a few million   
      years, the enriched material is blasted back into interstellar space   
      where star formation can begin anew. The expanding debris cloud known   
      as Cassiopeia A is an example of this final phase of the stellar life   
      cycle. Light from the explosion which created this supernova remnant   
      would have been first seen in planet Earth's sky about 350 years ago,   
      although it took that light about 11,000 years to reach us. This   
      false-color image, composed of X-ray and optical image data from the   
      Chandra X-ray Observatory and Hubble Space Telescope, shows the still   
      hot filaments and knots in the remnant. It spans about 30 light-years   
      at the estimated distance of Cassiopeia A. High-energy X-ray emission   
      from specific elements has been color coded, silicon in red, sulfur in   
      yellow, calcium in green and iron in purple, to help astronomers   
      explore the recycling of our galaxy's star stuff. Still expanding, the   
      outer blast wave is seen in blue hues. The bright speck near the center   
      is a neutron star, the incredibly dense, collapsed remains of the   
      massive stellar core.   
      
                        Tomorrow's picture: massive galaxy   
        __________________________________________________________________   
      
          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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