# Planck length and the speed of light

by helenk
Tags: length, light, planck, speed
 P: 15 How can the Planck length and the speed of light both be universal constants? Will the Planck length change depending on your frame of reference? :)
 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

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