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In this activity about light and perception, learners create pictures in thin air.

In this activity about light and perception, learners discover how a flash of light can create a lingering image called an "afterimage" on the retina of the eye.

In this optics activity, learners examine how a transparent material such as glass or water can actually reflect light better than any mirror.

Make a big canvas of iridescent color with pvc pipe! In this Exploratorium Science Snack, you'll need to cut and assemble some PVC pipe, but the pay-off, the soap-bubble canvas, is big.

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

This fun hands-on astronomy activity lets learners explore models of the Milky Way and other galaxies to get a sense of relative distances to other galaxies.