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Amazing Space
set of web-based activities primarily designed for classroom use.
http://amazing-space.stsci.edu/
Astro-classroom
Leonids observing parties for high school students of the world; held in 1998, 1999, 2000, and 2001. Also in Japanese.
http://www.astro-hs.net/
Imagine Mars
national arts, sciences, and technology education initiative that led young people to work together with educators and civic leaders to design a Mars community for 100 people.
http://marslander.jpl.nasa.gov/