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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 June 26   
      
                            Light Echoes from V838 Mon   
                    Image Credit: NASA, ESA, H. E. Bond (STScI)   
      
      Explanation: What caused this outburst of V838 Mon? For reasons   
      unknown, star V838 Mon's outer surface suddenly greatly expanded with   
      the result that it became one of the brighter stars in the Milky Way   
      Galaxy in early 2002. Then, just as suddenly, it shrunk and faded. A   
      stellar flash like this had never been seen before -- supernovas and   
      novas expel matter out into space. Although the V838 Mon flash appears   
      to expel material into space, what is seen in the featured image from   
      the Hubble Space Telescope is actually an outwardly expanding light   
      echo of the original flash. In a light echo, light from the flash is   
      reflected by successively more distant surfaces in the complex array of   
      ambient interstellar dust that already surrounded the star. V838 Mon   
      lies about 20,000 light years away toward the constellation of the   
      unicorn (Monoceros), while the light echo above spans about six light   
      years in diameter.   
      
                     Tomorrow's picture: gummy mountain stars   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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