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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 June 27   
      
                             MAVEN's Ultraviolet Mars   
        Image Credit: MAVEN, Laboratory for Atmospheric and Space Physics,   
                               Univ. Colorado, NASA   
      
      Explanation: These two global views of Mars were captured at   
      ultraviolet wavelengths, beyond the spectrum visible to human eyes.   
      Recorded by the MAVEN spacecraft's Imaging Ultraviolet Spectrograph   
      instrument in July 2022 (left) and January 2023, three otherwise   
      invisible ultraviolet bands are mapped into red, green, and blue   
      colors. That color scheme presents the Red Planet's surface features in   
      shades of tan and green. Haze and clouds appear white or blue, while   
      high altitude ozone takes on a dramatic purple hue. On the left, Mars'   
      south polar ice cap is in brilliant white at the bottom but shrinking   
      during the southern hemisphere's summer season. On the right, the   
      northern hemisphere's polar region is seen shrouded in clouds and   
      atmospheric ozone. Known to some as the Mars Atmosphere and Volatile   
      EvolutioN spacecraft, MAVEN has been exploring Mars' tenuous upper   
      atmosphere, ionosphere, and its interactions with the Sun and solar   
      wind since 2014.   
      
                         Tomorrow's picture: galaxies away   
        __________________________________________________________________   
      
          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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