# Planck length and the speed of light

by helenk
Tags: length, light, planck, speed
 P: 66 Planck length is based on 3 constants, none of which change due to speed $$\ell_{p}=\sqrt{\frac{\hbar G}{c^3}$$ Since $$\hbar$$ , G, and c are all constants, planck length also remains constant