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In this online activity, learners build their own system of heavenly bodies and watch the gravitational ballet.

This fun and simple hands-on astronomy activity lets learners experiment with marbles and weights to discover some basics about gravity and black holes.

In this online activity, learners use a realistic mass and spring laboratory. They hang masses from springs and adjust the spring stiffness and damping.

In this activity, learners use sieves with different-sized holes to sort balls by size.

This fun and simple hands-on astronomy activity lets learners imagine what would happen if our Sun were replaced with a black hole.