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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 February 23   
      
                               Orion over Green Bank   
                       Image Credit & Copyright: Dave Green   
      
      Explanation: What will the huge Green Bank Telescope discover tonight?   
      Pictured, the Robert C. Byrd Green Bank Telescope (GBT) on the lower   
      right is the largest fully-pointable single-dish radio telescope in the   
      world. With a central dish larger than a football field, the GBT is   
      nestled in the hills of West Virginia, USA in a radio quiet zone where   
      the use of cell phones, WiFi emitters, and even microwave ovens are   
      limited. The GBT explores our universe not only during the night -- but   
      during the day, too, since the daytime sky is typically dark in radio   
      waves. Taken in late January, the featured image was planned for months   
      to get the setting location of Orion just right. The image is a   
      composite of a foreground shot taken over a kilometer away from the   
      GBT, and a background shot built up of long exposures during the   
      previous night. The deep background image of Orion is fitting because   
      the GBT is famous for, among many discoveries, mapping the unusual   
      magnetic field in the Orion Molecular Cloud Complex.   
      
                        Tomorrow's picture: colorful stars   
        __________________________________________________________________   
      
          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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