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    { "id" : "http://dbpedia.org/resource/Density_wave_theory"
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        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "Density wave theory or the Lin-Shu density wave theory is a theory proposed by C.C. Lin and Frank Shu in the mid-1960s to explain the spiral arm structure of spiral galaxies.  Their theory introduces the idea of long-lived quasistatic density waves (also called heavy sound), which are sections of the galactic disk that have greater mass density (about 10–20% greater).  The theory has also been successfully applied to Saturn's rings." ] ,
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        "http://dbpedia.org/ontology/thumbnail" : [ "http://commons.wikimedia.org/wiki/Special:FilePath/Sig07-009.jpg?width=300"] } } }
