# What is the explanation behind Hubble's constant?

Hubble's Law $\left(\text{velocity of expansion" = H_0*"distance}\right)$
I understand Hubble's constant$\left({H}_{0} \approx 60 - 85 \frac{\text{km}}{s}\right)$ as the velocity (rate) at which galaxies are driving away from each other as the universe expands metrically in all directions.