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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 22   
      
                             Planet Earth at Twilight   
       Image Credit: ISS Expedition 2 Crew, Gateway to Astronaut Photography   
                                  of Earth, NASA   
      
      Explanation: No sudden, sharp boundary marks the passage of day into   
      night in this gorgeous view of ocean and clouds over our fair planet   
      Earth. Instead, the shadow line or terminator is diffuse and shows the   
      gradual transition to darkness we experience as twilight. With the Sun   
      illuminating the scene from the right, the cloud tops reflect gently   
      reddened sunlight filtered through the dusty troposphere, the lowest   
      layer of the planet's nurturing atmosphere. A clear high altitude   
      layer, visible along the dayside's upper edge, scatters blue sunlight   
      and fades into the blackness of space. This picture was taken in June   
      of 2001 from the International Space Station orbiting at an altitude of   
      211 nautical miles. Of course from home, you can check out the Earth   
      Now.   
      
                           Celebrate: Today is Earth Day   
                          Tomorrow's picture: Messier 104   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
                   NASA Web Privacy Policy and Important Notices   
                         A service of: ASD at NASA / GSFC   
                                & Michigan Tech. U.   
      
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