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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 April 17   
      
                                Shuttle Over Earth   
                      Image Credit: NASA, Expedition 22 Crew   
      
      Explanation: What's that approaching? Astronauts on board the   
      International Space Station in 2010 first saw it far in the distance.   
      Soon it enlarged to become a dark silhouette. As it came even closer,   
      the silhouette appeared to be a spaceship. Finally, the object revealed   
      itself to be the Space Shuttle Endeavour, and it soon docked as   
      expected with the Earth-orbiting space station. Pictured here,   
      Endeavour was imaged near Earth's horizon as it approached, where   
      several layers of the Earth's atmosphere were visible. Directly behind   
      the shuttle is the mesosphere, which appears blue. The atmospheric   
      layer that appears white is the stratosphere, while the orange layer is   
      Earth's Troposphere. Together, these thin layers of air -- collectively   
      spanning less than 2 percent of Earth's radius -- sustain us all in   
      many ways, including providing oxygen to breath and a barrier to   
      dangerous radiations from space.   
      
                         Coming up Friday: Earth Day 2022   
                          Tomorrow's picture: steppe sky   
        __________________________________________________________________   
      
          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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