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NASA
Nasa: Heliophysics: New Science of the Sun Solar System Connection
This site from NASA lists common and uncommon misconceptions about Sun-Earth Science. Site also provides links to activities and lesson plans as well as background reading.
Other
Catholic Educator's Resource Center: The Galileo Affair
Online essay concerning the battle between Galileo and the Catholic Church over the issue of heliocentrism, or, whether the sun or the earth is at the center of the universe.