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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 January 20   
      
                                NGC 7822 in Cepheus   
                       Image Credit & Copyright: Mark Carter   
      
      Explanation: Hot, young stars and cosmic pillars of gas and dust seem   
      to crowd into NGC 7822. At the edge of a giant molecular cloud toward   
      the northern constellation Cepheus, the glowing star forming region   
      lies about 3,000 light-years away. Within the nebula, bright edges and   
      dark shapes stand out in this colorful telescopic skyscape. The image   
      includes data from narrowband filters, mapping emission from atomic   
      oxygen, hydrogen, and sulfur into blue, green, and red hues. The   
      emission line and color combination has become well-known as the Hubble   
      palette. The atomic emission is powered by energetic radiation from the   
      central hot stars. Their powerful winds and radiation sculpt and erode   
      the denser pillar shapes and clear out a characteristic cavity   
      light-years across the center of the natal cloud. Stars could still be   
      forming inside the pillars by gravitational collapse but as the pillars   
      are eroded away, any forming stars will ultimately be cutoff from their   
      reservoir of star stuff. This field of view spans about 40 light-years   
      at the estimated distance of NGC 7822.   
      
                        Tomorrow's picture: pixels in space   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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                                & Michigan Tech. U.   
      
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