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            This is a file from the  Wikimedia Commons. Information from its  description page there is shown below.  Commons is a freely licensed media file repository.  You can help. 
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        Summary 
        
         
          
           | Description | 
           
             English: The average distance between Neptune and the Sun is 4.50 billion km (about 30.1 AU), and it completes an orbit on average every 164.79 years, subject to a variability of around ±0.1 years.  http://weelookang.blogspot.com/2011/06/ejs-open-source-kepler-3rd-law-system.html | 
          
          
           | Date | 
           11 July 2011 | 
          
          
           | Source | 
           Own work | 
          
          
           | Author | 
            Lookang many thanks to  author of original simulation = Todd K. Timberlake  author of Easy Java Simulation = Francisco Esquembre | 
          
         
         
        Licensing 
        
         
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           I, the copyright holder of this work, hereby publish it under the following license:
           
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