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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.   
      
                                 2024 November 20   
      
                                Earthset from Orion   
                           Image Credit: NASA, Artemis 1   
      
      Explanation: Eight billion people are about to disappear in this   
      snapshot from space taken on 2022 November 21. On the sixth day of the   
      Artemis I mission, their home world is setting behind the Moon's bright   
      edge as viewed by an external camera on the outbound Orion spacecraft.   
      Orion was headed for a powered flyby that took it to within 130   
      kilometers of the lunar surface. Velocity gained in the flyby maneuver   
      was used to reach a distant retrograde orbit around the Moon. That   
      orbit is considered distant because it's another 92,000 kilometers   
      beyond the Moon, and retrograde because the spacecraft orbited in the   
      opposite direction of the Moon's orbit around planet Earth. Orion   
      entered its distant retrograde orbit on November 25. Swinging around   
      the Moon, Orion reached a maximum distance (just over 400,000   
      kilometers) from Earth on November 28, exceeding a record set by Apollo   
      13 for most distant spacecraft designed for human space exploration.   
      The Artemis II mission, carrying 4 astronauts around the moon and back   
      again, is scheduled to launch no earlier than September 2025.   
      
                        Tomorrow's picture: pixels in space   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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