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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.
Transit Tracks
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In this space science activity, learners explore transits and the conditions when a transit may be seen.
Reason for the Seasons
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In this activity (on page 6 of the PDF), learners plot the path of the sun's apparent movement across the sky on two days, with the second day occurring two or three months after the first.