Most people will agree that there can only be one reality, and that there for this reason can be but one explanation to the physical world as we know it. Even if we believe
There is a whole lot of confusion around the concept of mass in physics.
The most common mistake is to confuse matter for mass as if the two things are the same.
In a universe where all physical properties are associated with matter, space itself has no properties. To illustrate this point, consider the void which is an infinity of nothing.
When modern physics got rid of the aether, all sorts of trouble emerged. The electric force, the magnetic force and gravity were suddenly mysterious actions at a distance.