Hi, as an engineer i dont have much formal training in theoretical physics so bare with me. As most of you know, we can only understand 4% of our universe with the current models we have. The rest of the 96% is dark matter and dark energy (23% and 73%, respectively). Could these unexplained phenomena be a consequence of G, gravitational constant, not being a constant at all, but a variable dependent on a scalar field that it itself is dependent on the amount of matter surrounding a certain point? As mentioned, this variable would increase if there is a large matter density surrounding it, thus in the context of a galaxy it would explain dark matter. And become negative in the space between galaxies where the matter density surrounding it is extremely low, thusly explaining dark energy. I know the math behind this might be very simplistic and that in theory dark energy actually expands space itself, but i would very much appreciate it if someone with deeper knowledge on this issue gave it a thought! Thanks before hand to all of you!