Comment by nojvek

'Grand Unified Theory' or the 'Theory of Everything' is to unite Quantum Mechanics with General/Special Relativity.

At scale of things in space (asteroids, planets, satellites, stars, galaxies) - We only need two constants (speed of light, and gravitational constant). The spacetime fabric bending explains everything we see at the scale. Things are very deterministic and have been verified with tons of experiments for decades around the globe.

At the quantum scale, gravity is an extremely weak force but it is still there. We have planks constant (h), elementary charge (e), speed of light.

You are right, that someday we may derive gravitational constant from another elementary particle constant.

I am not so sure about speed of light though.