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The Geophysical Light/Dark Cycle
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This is an activity (located on page 131 of the PDF) related to sleep and circadian rhythms as well as space travel.
Morning Star and Evening Star
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This demonstration activity models how Venus appears from Earth.
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.
Light of the Moon
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Learners model the Sun-Earth-Moon system to show what causes the Moon's appearance to change when viewed from the Earth.
Scale Model of Sun and Earth
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In this activity, learners explore the relative size of the Sun and Earth as well as the distance between them.
The Thousand-Yard Model
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This is a classic exercise for visualizing the scale of the Solar System.
Eclipse: How can the little Moon hide the giant Sun?
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In this activity, learners explore how distance can affect the way we perceive the size of an object.