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In this activity, learners will measure the length of their shadow from the Sun and compare it three to four months later.

In this exercise (Activity #2 on page), learners test their distance vision to evaluate their overall eyesight.

In this activity, learners investigate parallax, a method used to measure distances to stars and planets in the solar system.

In this international citizen science activity, learners measure their night sky brightness and submit their observations into an online database.

Use this hands-on activity to demonstrate infrared and thermal radiation.