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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 23   
      
                           The Bubble Nebula from Hubble   
       Image Credit: NASA, ESA, Hubble; Processing & Copyright: Mehmet Hakan   
                                      +ûzsara+º   
      
      Explanation: Massive stars can blow bubbles. The featured image shows   
      perhaps the most famous of all star-bubbles, NGC 7635, also known   
      simply as The Bubble Nebula. Although it looks delicate, the   
      7-light-year diameter bubble offers evidence of violent processes at   
      work. Above and left of the Bubble's center is a hot, O-type star,   
      several hundred thousand times more luminous and some 45-times more   
      massive than the Sun. A fierce stellar wind and intense radiation from   
      that star has blasted out the structure of glowing gas against denser   
      material in a surrounding molecular cloud. The intriguing Bubble Nebula   
      and associated cloud complex lie a mere 7,100 light-years away toward   
      the boastful constellation Cassiopeia. This sharp, tantalizing view of   
      the cosmic bubble is a reprocessed composite of previously acquired   
      Hubble Space Telescope image data.   
      
        Birthday Surprise: What picture did APOD feature on your birthday?   
                                    (post 1995)   
                          Tomorrow's picture: open space   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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                         A service of: ASD at NASA / GSFC   
                                & Michigan Tech. U.   
      
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