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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 June 30   
       A dark background is filled with many light-blue ellipses. Toward the   
         center, near circles that are labelled as the orbits of the inner   
       planets of our Solar System are drawn. Please see the explanation for   
                            more detailed information.   
      
                     Orbits of Potentially Hazardous Asteroids   
                      Illustration Credit: NASA, JPL-Caltech   
      
      Explanation: Are asteroids dangerous? Some are, but the likelihood of a   
      dangerous asteroid striking the Earth during any given year is low.   
      Because some past mass extinction events have been linked to asteroid   
      impacts, however, humanity has made it a priority to find and catalog   
      those asteroids that may one day affect life on Earth. Pictured here   
      are the orbits of the over 1,000 known Potentially Hazardous Asteroids   
      (PHAs). These documented tumbling boulders of rock and ice are over 140   
      meters across and will pass within 7.5 million kilometers of Earth --   
      about 20 times the distance to the Moon. Although none of them will   
      strike the Earth in the next 100 years -- not all PHAs have been   
      discovered, and past 100 years, many orbits become hard to predict.   
      Were an asteroid of this size to impact the Earth, it could raise   
      dangerous tsunamis, for example. To investigate Earth-saving   
      strategies, NASA successfully tested the Double Asteroid Redirection   
      Test (DART) mission last year. Of course, rocks and ice bits of much   
      smaller size strike the Earth every day, usually pose no danger, and   
      sometimes create memorable fireball and meteor displays.   
      
             Today is: Asteroid Day Tomorrow's picture: three galaxies   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
                   NASA Web Privacy Policy and Important Notices   
                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
   --- BBBS/Li6 v4.10 Toy-6   
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