We know that 1. Mass causes bend in space-time and this is the how gravitation occurs. 2. The formula for gravitation (per the universal law of gravitation) is product of masses divided by the square of the distance between them and multiplied by the universal gravitation constant. I wonder if the following been done: Calculate the amount of "bend" in space time via use of 1 & 2 above. for example take earth and sun. both are causing "bends" (3D/4D) in space-time.