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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 March 19   
      
                              2MASS J17554042+6551277   
                         Image Credit : NASA, STScI, JWST   
      
      Explanation: 2MASS J17554042+6551277 doesn't exactly roll off the   
      tongue but that's the name, a coordinate-based catalog designation, of   
      the star centered in this sharp field of view. Fans of the distant   
      universe should get used to its spiky appearance though. The   
      diffraction pattern is created by the 18 hexagonal mirror segments of   
      the James Webb Space Telescope. After unfolding, the segments have now   
      been adjusted to achieve a diffraction limited alignment at infrared   
      wavelengths while operating in concert as a single 6.5 meter diameter   
      primary mirror. The resulting image taken by Webb's NIRcam demonstrates   
      their precise alignment is the best physics will allow. 2MASS   
      J17554042+6551277 is about 2,000 light-years away and well within our   
      own galaxy. But the galaxies scattered across the background of the   
      Webb telescope alignment evaluation image are likely billions of   
      light-years distant, far beyond the Milky Way.   
      
                          Tomorrow's picture: day = night   
        __________________________________________________________________   
      
          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.   
      
   --- BBBS/Li6 v4.10 Toy-6   
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