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    NASA
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    In this activity, learners explore how distance can affect the way we perceive the size of an object. It also introduces learners to solar eclipses as well as the Sun and Moon's sizes and...

    free Ages 4 - 18 5 to 10 minutes
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    PhET
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    In this online activity, learners build their own system of heavenly bodies and watch the gravitational ballet. With this orbit simulator, learners can set initial positions, velocities, and masses...

    free Ages 11 - adult 10 to 30 minutes
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    Colorado State University
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    In this activity, learners simulate the behavior of the atmosphere. Learners working in groups of four will represent "cells" of the model (Earth, lower atmosphere, upper atmosphere, and...

    free Ages 8 - 14 10 to 30 minutes

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