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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 April 6   
       An astronaut is seen standing on the Moon next to an instrument with   
      the lunar lander several meters in the distance. The dark of deep space   
         covers the top of the frame. Please see the explanation for more   
                               detailed information.   
      
                          Moonquakes Surprisingly Common   
                        Image Credit: NASA, Apollo 11 Crew   
      
      Explanation: Why are there so many moonquakes? Analyses of seismometers   
      left on the moon during the Apollo moon landings reveal a surprising   
      number of moonquakes occurring within 100 kilometers of the surface. In   
      fact, 62 moonquakes were detected in data recorded between 1972 and   
      1977. Many of these moonquakes are not only strong enough to move   
      furniture in a lunar apartment, but the stiff rock of the moon   
      continues to vibrate for many minutes, significantly longer than the   
      softer rock earthquakes on Earth. The cause of the moonquakes remains   
      unknown, but a leading hypothesis include tidal gravity from -- and   
      relative heating by -- our Earth. Regardless of the source, future moon   
      dwellings need to be built to withstand the frequent shakings. Pictured   
      here, Apollo 11 astronaut Buzz Aldrin stands beside a recently deployed   
      lunar seismometer, looking back toward the lunar landing module.   
      
                   Explore Your Universe: Random APOD Generator   
                        Tomorrow's picture: yes, flocculent   
        __________________________________________________________________   
      
          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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