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NASA's Imagine the Universe: Dark Matter
Brief discussions of dark matter, "[the] name given to the amount of mass whose existence is deduced from the analysis of galaxy rotation curves but which until now, has escaped all detections." Includes definitions of astronomy terms, a FAQ, additional activities, and links to related websites. From a NASA educational website intended for students age 14 and up.
http://imagine.gsfc.nasa.gov/docs/introduction/dark_matter.html
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