Subject: Astronomy & Space Sciences

Discover why the sky is blue and the sunset is red.

Make a truth teller for light.

Create a scale model of the earth-moon system using spheres of different sizes.

Prove to yourself that Galileo was right.

Just spew it—build your own cyclic hot water fountain.

Why is the sky blue? That's a sticky question.

Measure the height of an object indirectly using your hand and a ratio.

Find the height of a tree, a flying paper rocket, or even the North Star!

Watch the rise and fall of hot and cold fluids.

It’s cool to be dense—just watch these convection cells.

How I wonder what you are?

Model the patterns of day and night on Earth by holding a globe in just the right position.

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