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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 June 14   
      
                            Satellites Behind Pinnacles   
                     Image Credit & Copyright: Joshua Rozells   
      
      Explanation: What are all those streaks across the background?   
      Satellite trails. First, the foreground features picturesque rock   
      mounds known as Pinnacles. Found in the Nambung National Park in   
      Western Australia, these human-sized spires are made by unknown   
      processes from ancient sea shells (limestone). Perhaps more   
      eye-catching, though, is the sky behind. Created by low-Earth orbit   
      satellites reflecting sunlight, all of these streaks were captured in   
      less than two hours and digitally combined onto the single featured   
      image, with the foreground taken consecutively by the same camera and   
      from the same location. Most of the streaks were made by the developing   
      Starlink constellation of communication satellites, but some are not.   
      In general, the streaks are indicative of an increasing number of   
      satellites nearly continuously visible above the Earth after dusk and   
      before dawn. Understanding and removing the effects of satellite trails   
      on images from Earth's ground-based cameras and telescopes is now   
      important not only for elegant astrophotography, but for humanity's   
      scientific understanding of the distant universe.   
      
       Astrophysicists: Browse 2,800+ codes in the Astrophysics Source Code   
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