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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 April 7   
      
                                    Rigel Wide   
                          Image Credit: Rheinhold Wittich   
      
      Explanation: Brilliant, blue, supergiant star Rigel marks the foot of   
      Orion the Hunter in planet Earth's night. Designated Beta Orionis, it's   
      at the center of this remarkably deep and wide field of view. Rigel's   
      blue color indicates that it is much hotter than its rival supergiant   
      in Orion the yellowish Betelgeuse (Alpha Orionis), though both stars   
      are massive enough to eventually end their days as core collapse   
      supernovae. Some 860 light-years away, Rigel is hotter than the Sun too   
      and extends to about 74 times the solar radius. That's about the size   
      of the orbit of Mercury. In the 10 degree wide frame toward the nebula   
      rich constellation, the Orion Nebula is at the upper left. To the right   
      of Rigel and illuminated by its brilliant blue starlight lies the dusty   
      Witch Head Nebula. Rigel is part of a multiple star system, though its   
      companion stars are much fainter.   
      
                        Tomorrow's picture: medieval times   
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          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,   
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                                & Michigan Tech. U.   
      
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