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Sources:
http://www.universetoday.com/84129/why-does-saturn-have-rings/
http://saturn.jpl.nasa.gov/science/index.cfm?SciencePageID=55
http://blog.hmns.org/2010/04/the-roche-limit-why-does-saturn-have-rings/
http://io9.com/5931098/using-the-roche-limit-to-put-a-ring-around-earth
http://blogs.scientificamerican.com/observations/2009/11/25/what-would-rings-around-earth-look-like/
http://www.nature.com/nature/journal/v285/n5763/abs/285309a0.html