Well, if we consider the universe as a closed, isolated system, then the law of conservation of momentum should kick in. P = MV We know that Hubble's law states that the velocity of bodies on an astronomical scale is increasing and P is a constant, so that means M must be decreasing. However, the first law of thermodynamics states that the amount of matter/energy in the universe is also a constant. Therefore, if the universe is a closed system, P and M must be constant, ergo V must be constant too and thats absurd to say by the means of Hubble's law. Can I be refuted?