4M Phosphorescent Pack. 4M Phosphorescent Nova Planets & Supernova is a fun set with 9 luminous planets and 20 luminous stars. How do they light up? Let the stars and planets bathe in the light for 1 minute. Turn off the light and you will see them shine! All shapes contain a special substance that can be recharged in the light again and again. Hang them from the ceiling in your room and you will sleep under a beautiful starry sky! Dimensions including packaging: 16 x 16 centimeters