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Why Does the Moon Have Phases?
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In this activity, learners use a simple 3D model to discover why the Moon has phases.
The Thousand-Yard Model
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This is a classic exercise for visualizing the scale of the Solar System.
Measure the Sun's Size
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In this activity, learners make their own pinhole viewer in order to measure the size of the sun.
Oil Spot Photometer
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In this math activity related to light, learners assemble a photometer and use it to estimate the power output of the Sun.