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NASA
Collecting Electromagnetic Radiation
Astronomy is literally over your head, but this lesson will explain how we study it. Young scientists make telescopes, calculate and compare the light gathering power of lenses, and simulate detection of infared radiation....
CK-12 Foundation
Ck 12: Fifth Grade Science: Earth Science: The Sun Earth Moon System
[Free Registration/Login may be required to access all resource tools.] Discusses solar and lunar eclipses, the phases of the Moon, and why the phases occur.