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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.   
      
                                  2024 February 9   
      
                               When Roses Aren't Red   
        Image Credit & Copyright: Tommy Lease (Denver Astronomical Society)   
      
      Explanation: Not all roses are red of course, but they can still be   
      very pretty. Likewise, the beautiful Rosette Nebula and other star   
      forming regions are often shown in astronomical images with a   
      predominately red hue, in part because the dominant emission in the   
      nebula is from hydrogen atoms. Hydrogen's strongest optical emission   
      line, known as H-alpha, is in the red region of the spectrum. But the   
      beauty of an emission nebula need not be appreciated in red light   
      alone. Other atoms in the nebula are also excited by energetic   
      starlight and produce narrow emission lines as well. In this close-up   
      view of the Rosette Nebula, narrowband images are mapped into broadband   
      colors to show emission from Sulfur atoms in red, Hydrogen in green,   
      and Oxygen in blue. In fact, the scheme of mapping these narrow atomic   
      emission lines (SHO) into the broader colors (RGB) is adopted in many   
      Hubble images of emission nebulae. This image spans about 50   
      light-years across the center of the Rosette Nebula. The nebula lies   
      some 3,000 light-years away in the constellation Monoceros.   
      
                           Tomorrow's picture: ingenuity   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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                                & Michigan Tech. U.   
      
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