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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 July 11   
      
                         Andromeda over the Sahara Desert   
                           Credit & Copyright: Jordi Coy   
      
      Explanation: What is the oldest thing you can see? At 2.5 million light   
      years distant, the answer for the unaided eye is the Andromeda galaxy,   
      because its photons are 2.5 million years old when they reach you. Most   
      other apparent denizens of the night sky -- stars, clusters, and   
      nebulae -- appear as they were only a few hundred to a few thousand   
      years ago, as they lie well within our own Milky Way Galaxy. Given its   
      distance, light from Andromeda is likely also the farthest object that   
      you can see. Also known as M31, the Andromeda Galaxy dominates the   
      center of the featured zoomed image, taken from the Sahara Desert in   
      Morocco last month. The featured image is a combination of three   
      background and one foreground exposure -- all taken with the same   
      camera and from the same location and on the same calendar day -- with   
      the foreground image taken during the evening blue hour. M110, a   
      satellite galaxy of Andromenda is visible just above and to the left of   
      M31's core. As cool as it may be to see this neighboring galaxy to our   
      Milky Way with your own eyes, long duration camera exposures can pick   
      up many faint and breathtaking details. Recent data indicates that our   
      Milky Way Galaxy will collide and combine with the similarly-sized   
      Andromeda galaxy in a few billion years.   
      
                       Tomorrow's picture: noctilucent tower   
        __________________________________________________________________   
      
          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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