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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 April 4   
       A large orange volcano is pictured on Mars from above. Please see the   
                    explanation for more detailed information.   
      
                 Olympus Mons: Largest Volcano in the Solar System   
      Image Credit: ESA, DLR, FU Berlin, Mars Express; Processing & CC BY 2.0   
                               License: Andrea Luck   
      
      Explanation: The largest volcano in our Solar System is on Mars.   
      Although three times higher than Earth's Mount Everest, Olympus Mons   
      will not be difficult for humans to climb because of the volcano's   
      shallow slopes and Mars' low gravity. Covering an area greater than the   
      entire Hawaiian volcano chain, the slopes of Olympus Mons typically   
      rise only a few degrees at a time. Olympus Mons is an immense shield   
      volcano, built long ago by fluid lava. A relatively static surface   
      crust allowed it to build up over time. Its last eruption is thought to   
      have been about 25 million years ago. The featured image was taken by   
      the European Space Agency's robotic Mars Express spacecraft currently   
      orbiting the Red Planet.   
      
        Your Sky Surprise: What picture did APOD feature on your birthday?   
                                    (post 1995)   
                          Tomorrow's picture: open space   
        __________________________________________________________________   
      
          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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