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This is a classic exercise for visualizing the scale of the Solar System.

In this activity, learners build a scale model of the solar system using a roll of toilet paper.

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.

In this small-group activity, learners assume the roles of pilots, air traffic controllers, and NASA scientists to solve five Air Traffic Control (ATC) problems.