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

In this activity, learners make scale models of the Sun and Earth out of paper mache.

This fun and simple hands-on astronomy activity lets learners build a scale model of the universe with little more than adding machine tape.

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

In this activity, learners are challenged to calculate their own weight on various planets using a scale and calculator. Older learners may be challenged to do so without using calculators.

Based of the The Tech Challenge 2015, learners will engage in two mini-design challenges related to seismic engineering.

In this fun and simple hands-on astronomy activity, learners construct a model of our place in the Milky Way Galaxy and the distribution of stars, with a quarter and some birdseed.

Water on Earth is in lakes, the ocean, rivers, underground, and frozen glaciers.