Gravity is induced electrostatic force between separate matters. Matter is formed from charged particles. Those charges force fields reach infinite distance. By the nature of charges, between electrically neutral charged matters there is induced attraction force, the force strength is proportional to the product of masses ( total combined charges) and inversely proportional to distance square.

Why light speed, gravity speed and electrostatic force speed are the same?

Why light strength, gravity strength and electrostatic force strength all inversely proportional to distance square?

From the greatest 2 physics laws can we connect the dots?

F=Gm1m2/rr and F=Keq1q2/rr

Without charged particles and their electrostatic force to form atoms, there is no matter.

Why matter has mass? Because charges carry force, we use force to measure mass.

Matters carry more charges also carry more force, need more force to move it, therefore measure as more mass.

There are many theories about gravity, check out wiki, see which one you like the most.

Gravity has nothing to do with space and time, gravity only exists and works between and within masses.

Gravity does not curve time but affects timer moving rate. Time has no mass nor charge, has nothing to do with gravity. Timers are made from matter/charges, therefore affected by gravity. 

Sand timer goes slower at higher place, stops moving at micro gravity. Why?