This Wikipedia article gives an explanation of dark matter. A detailed history is offered providing many different lines of evidence. Numerous images are included on the site as well.
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Keywords:Dark Matter,Informal Education,Higher Education,oai:nsdl.org:2200/20080905112235029T,NSDL,dark matter,Undergraduate (Lower Division),Middle School,Cosmology,cosmology,galaxy cluster,uniform circular motion,High School,NSDL_SetSpec_439869,Space Science,rotation curves,big bang theory,Astronomy,Physics
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