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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 October 12   
      
                                     Mu Cephei   
                       Image Credit & Copyright: David Cruz   
      
      Explanation: Mu Cephei is a very large star. An M-class supergiant some   
      1500 times the size of the Sun, it is one of the largest stars visible   
      to the unaided eye, and even one of the largest in the entire Galaxy.   
      If it replaced the Sun in our fair Solar System, Mu Cephei would easily   
      engulf Mars and Jupiter. Historically known as Herschel's Garnet Star,   
      Mu Cephei is extremely red. Approximately 2800 light-years distant, the   
      supergiant is seen near the edge of reddish emission nebula IC 1396   
      toward the royal northern constellation Cepheus in this telescopic   
      view. Much cooler and hence redder than the Sun, this supergiant's   
      light is further reddened by absorption and scattering due to   
      intervening dust within the Milky Way. A well-studied variable star   
      understood to be in a late phase of stellar evolution, Mu Cephei is a   
      massive star too, destined to ultimately explode as a core-collapse   
      supernova.   
      
      APOD editor to speak: in Houghton, Michigan tonight, Thursday, October   
                                    12, at 6 pm   
                        Tomorrow's picture: pixels in space   
        __________________________________________________________________   
      
          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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