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Is it possible that dark matter and dark energy are illusions caused by the fact that the equations of physics are only approximations? For example, in the falling body equation, F = mg, F (the initial weight of an object) is assumed to be constant, but in fact the closer to the accelerating mass (e.g., the Earth) the greater F is. The mass, m, in the equation is also not a constant, because the farther an object is from the accelerating body (e.g., Earth) the less mass an object has. And finally, the acceleration constant, g, is not constant because it changes with time, and therefore it is actually an accelerating acceleration, which is abhorrent to physicists because it implies the concept of force per time, which implies that as time approaches zero, force approaches infinity, which means that there is no such thing as zero time, for any action-reaction, including the Big Bang. The "zero now" does not exist. Furthermore, even the universal gravitational constant, G, is really not a constant because the masses of attracting objects change with the distance between them. Of course the errors due to the fact that F, m, g, and G are not constant are normally insignificant, but are they insignificant on the cosmic scale, like when we calculate the mass of a galaxy? That is my question.