If the Law of the Conservation of Mass is correct, than additional mass cannot simply be added to the universe at any random time without it having to lose an equivalent amount of mass (or energy) at the same time.

Speculations about time travel suggest we can take a 185 pound person and send him back hundreds of years. Wouldn't this cause the universe to lose 185 lbs of mass in our time while gaining it (seemingly from out of nowhere) at another time.

Time travel would make the mass of the universe variable, unstable and unpredictable at any given time.

Doesn't the Law of the Conservation of Mass eliminate the possibility of time travel?

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