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The Thousand-Yard Model
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This is a classic exercise for visualizing the scale of the Solar System.

Counting With Quadrants
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Millions of organisms can live in and around a body of water.

Where Are the Distant Worlds? Star Maps
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This fun hands-on astronomy activity lets learners use star maps (included) to find constellations and to identify stars with extrasolar planets (Northern Hemisphere only, naked eye).