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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.   
      
                                  2026 January 20   
       A big ball that is mostly yellow is shown. The ball has many circular   
        and irregular regions that are different colors, typically brown or   
      olive green. Please see the explanation for more detailed information.   
      
                                 Io in True Color   
                     Image Credit: NASA, JPL, Galileo Project   
      
      Explanation: The strangest moon in the Solar System is bright yellow.   
      The featured picture, an attempt to show how Io would appear in the   
      "true colors" perceptible to the average human eye, was taken in 1999   
      July by the Galileo spacecraft that orbited Jupiter from 1995 to 2003.   
      Io's colors derive from sulfur and molten silicate rock. The unusual   
      surface of Io is kept very young by its system of active volcanoes. The   
      intense tidal gravity of Jupiter stretches Io and damps wobbles caused   
      by Jupiter's other Galilean moons. The resulting friction greatly heats   
      Io's interior, causing molten rock to explode through the surface. Io's   
      volcanoes are so active that they are effectively turning the whole   
      moon inside out. Some of Io's volcanic lava is so hot it glows in the   
      dark.   
      
                          Tomorrow's picture: open space   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
                     NASA Web Privacy, Accessibility, Notices;   
                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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