" Planck noted that although the Andromedans wouldn't have access to our rulers, scales, or clocks, they would have access to our physical laws, which are the same as theirs. They could measure, in particular, three universal constants:

c: The speed of light.

G: Newton's gravitational constant. In Newton's theory, this is a measure of the strength of gravity. To be precise, in Newton's law of gravity, the gravitational force between the bodies of masses m1, m2 separated by distance r is Gm1m2/r^2.

h: Planck's constant. "

― Frank Wilczek , The Lightness of Being: Mass, Ether, and the Unification of Forces