Stick the planets on the walls or ceiling of your bedroom with the sticky tabs provided. Expose the planets to a light source for a few minutes. When you turn off the light they will glow in the dark.
If you buy 2 packs you can create a 3D solar system mobile. Connect the identical planets together from the two packs using the joints provided- tie the planets with thread and hang them from your bedroom ceiling above your bed. They glow at night!