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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.
Weighty Questions
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In this activity about humans and space travel (page 1 of PDF), learners compare and contrast the behavior of a water-filled plastic bag, both outside and inside of a container of water.
My Solar System
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In this online activity, learners build their own system of heavenly bodies and watch the gravitational ballet.