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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.   
      
                                   2025 June 15   
       Two images are shown side by side. On the left is a sunset seen from   
      Earth, while on the right is a sunset seen from Mars. The Earth sunset   
       is quite orange, while the Mars sunset is quite blue. The Sun appears   
          angularly smaller from Mars than from the Earth. Please see the   
                    explanation for more detailed information.   
      
                                Two Worlds, One Sun   
                    Left Image Credit & Copyright: Damia Bouic;   
      Right Image Credit: NASA, JPL-Caltech, MSSS; Digital processing: Damia   
                                       Bouic   
      
      Explanation: How different does sunset appear from Mars than from   
      Earth? For comparison, two images of our common star were taken at   
      sunset, one from Earth and one from Mars. These images were scaled to   
      have the same angular width and are featured here side-by-side. A quick   
      inspection will reveal that the Sun appears slightly smaller from Mars   
      than from Earth. This makes sense since Mars is 50% further from the   
      Sun than Earth. More striking, perhaps, is that the Martian sunset is   
      noticeably bluer near the Sun than the typically orange colors near the   
      setting Sun from Earth. The reason for the blue hues from Mars is not   
      fully understood, but thought to be related to forward scattering   
      properties of Martian dust. The terrestrial sunset was taken in 2012   
      March from Marseille, France, while the Martian sunset was captured in   
      2015 by NASA's robotic Curiosity rover from Gale crater on Mars.   
      
          APOD Turns 30!: Free Public Lecture in Cork, Ireland on June 24   
                             Tomorrow's picture: S30E1   
        __________________________________________________________________   
      
          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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