The galaxies in the universe appear to be accelerating away from each other according to the Doppler shift that is present in the light we receive from other galaxies.
According to Newtonian mechanics for something to accelerate, a force must be applied to it, and if the accleration is constant, then the force must be constantly applied.
If this is the case, then what force or forces is (or are) causing galaxies to accelerate?
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