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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.   
      
                                    2023 May 13   
      
                           Apollo 17: The Crescent Earth   
               Image Credit: Apollo 17, NASA; Restoration - Toby Ord   
      
      Explanation: Our fair planet sports a curved, sunlit crescent against   
      the black backdrop of space in this stunning photograph. From the   
      unfamiliar perspective, the Earth is small and, like a telescopic image   
      of a distant planet, the entire horizon is completely within the field   
      of view. Enjoyed by crews on board the International Space Station,   
      only much closer views of the planet are possible from low Earth orbit.   
      Orbiting the planet once every 90 minutes, a spectacle of clouds,   
      oceans, and continents scrolls beneath them with the partial arc of the   
      planet's edge in the distance. But this digitally restored image   
      presents a view so far only achieved by 24 humans, Apollo astronauts   
      who traveled to the Moon and back again between 1968 and 1972. The   
      original photograph, AS17-152-23420, was taken by the homeward bound   
      crew of Apollo 17, on December 17, 1972. For now it is the last picture   
      of Earth from this planetary perspective taken by human hands.   
      
                          Tomorrow's picture: free space   
        __________________________________________________________________   
      
          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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