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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.   
      
                                   2025 April 20   
        A complex nebula fills the frame that is brightly colored, with red   
         being prominent in the image center and blue being most prominent   
        elsewhere. Stars also dot the image. Please see the explanation for   
                            more detailed information.   
      
                     The Orion Nebula in Visible and Infrared   
        Image Credit & Copyright: Infrared: NASA, Spitzer Space Telescope;   
                   Visible: Oliver Czernetz, Siding Spring Obs.   
      
      Explanation: The Great Nebula in Orion is a colorful place. Visible to   
      the unaided eye, it appears as a small fuzzy patch in the constellation   
      of Orion. Long exposure, multi-wavelength images like this, however,   
      show the Orion Nebula to be a busy neighborhood of young stars, hot   
      gas, and dark dust. This digital composite features not only three   
      colors of visible light but four colors of infrared light taken by   
      NASA's orbiting Spitzer Space Telescope as well. The power behind much   
      of the Orion Nebula (M42) is the Trapezium - four of the brightest   
      stars in the nebula. Many of the filamentary structures visible are   
      actually shock waves - fronts where fast moving material encounters   
      slow moving gas. The Orion Nebula spans about 40 light years and is   
      located about 1500 light years away in the same spiral arm of our   
      Galaxy as the Sun.   
      
                    Tomorrow's picture: galaxy-sized telescope   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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