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NASA gives an explanation of what makes up most of our Universe -- Dark Matter. This easy-to-understand site is best for grades K-8. 
Grade Level   K 1 2 3 4 5 6 7 8
Classroom Activities Curricula and Instruction
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"K-8 teachers and space enthusiasts of all ages, start your school year off right with a Solar System Bulletin Board from the NASA/JPL Educator Resource Center. The resources include a poster of Saturn's Titan Moon, taken by NASA's Cassini mission, along with student activities for grades 1-8; a...
Grade Level   K 1 2 3 4 5 6 7 8
Classroom Activities Curricula and Instruction
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