19. Planet Neptune
    
    http: //members.tripod.com/JayHind/Pneptune.html
    
    
20. Neptune
    Neptune is the outermost planet of the gas giants. It has an equatorial diameter of 49500 km. If Neptune were hollow, it could contain nearly 60 Earths. Neptune orbits the Sun every 165 years.
    http: //solarviews.com/eng/neptune.htm
    
    
21. Neptune's Ring System
    
    http: //ringmaster.arc.nasa.gov/neptune/neptune.htm...
    
    
22. Neptune - A-to-Z Science - DiscoverySchool.com
    Neptune is one of the two planets that cannot be seen without a telescope. A-to-Z Science is brought to you by DiscoverySchool.com and powered by World Book Online.
    http: //school.discovery.com/homeworkhelp/worldbook...
    
    

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