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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 September 7   
      An illustration of planet Earth is shown where the Earth is tan and has   
      no water shown on its surface. In the foreground are several small blue   
      spheres showing how much water is known to reside on our planet. Please   
                see the explanation for more detailed information.   
      
                           All the Water on Planet Earth   
       Illustration Credit: Jack Cook, Adam Nieman, Woods Hole Oceanographic   
                    Institution; Data source: Igor Shiklomanov   
      
      Explanation: How much of planet Earth is made of water? Very little,   
      actually. Although oceans of water cover about 70 percent of Earth's   
      surface, these oceans are shallow compared to the Earth's radius. The   
      featured illustration shows what would happen if all of the water on or   
      near the surface of the Earth were bunched up into a ball. The radius   
      of this ball would be only about 700 kilometers, less than half the   
      radius of the Earth's Moon, but slightly larger than Saturn's moon Rhea   
      which, like many moons in our outer Solar System, is mostly water ice.   
      The next smallest ball depicts all of Earth's liquid fresh water, while   
      the tiniest ball shows the volume of all of Earth's fresh-water lakes   
      and rivers. How any of this water came to be on the Earth and whether   
      any significant amount is trapped far beneath Earth's surface remain   
      topics of research.   
      
                        Tomorrow's picture: butterfly webb   
        __________________________________________________________________   
      
          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.   
      
   --- BBBS/Li6 v4.10 Toy-7   
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