+ F: attraction force between energy 1 and energy 2 [N]
+ G2: attraction constant of the energy [N*(m^2)/(J^2)]
+ E1: energy 1 [J]
+ E2: energy 2 [J]
+ r: distance between energy 1 and energy 2 [m]
+ G: gravitational constant [N*(m^2)/(kg^2)]
+ c: speed of light [m/s]
