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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 September 13   
      
               Aurora Australis and the International Space Station   
                       Image Credit: NASA, ISS Expedition 71   
      
      Explanation: This snapshot from the International Space Station was   
      taken on August 11 while orbiting about 430 kilometers above the Indian   
      Ocean, Southern Hemisphere, planet Earth. The spectacular view looks   
      south and east, down toward the planet's horizon and through red and   
      green curtains of aurora australis. The auroral glow is caused by   
      emission from excited oxygen atoms in the extremely rarefied upper   
      atmosphere still present at the level of the orbiting outpost. Green   
      emission from atomic oxygen dominates this scene at altitudes of 100 to   
      250 kilometers, while red emission from atomic oxygen can extend as   
      high as 500 kilometers altitude. Beyond the glow of these southern   
      lights, this view from low Earth orbit reveals the starry sky from a   
      southern hemisphere perspective. Stars in Orion's belt and the Orion   
      Nebula are near the Earth's limb just left of center. Sirius, alpha   
      star of Canis Major and brightest star in planet Earth's night is above   
      center along the right edge of the southern orbital skyscape.   
      
                 Looking Up: International Observe the Moon Night   
                    Tomorrow's picture: If the Moon could smile   
        __________________________________________________________________   
      
          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,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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