Kosmos Experiment Set: Make Bouncy Balls That Look Like Planets

Create five colorful, bouncy balls that resemble planets – in just a few minutes! Using a spherical mold and five colors of polymer granules, you can craft up to five rubbery planet models. Discover why the balls form and how the polymer’s elasticity makes them bounce.

No preparation needed – just mix the granules with water, and you’re all set!