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Newton's law of gravity Force = Gm1 m2 / r^2, can be used to calculate the force that the universe as a whole exerts on a particle at its surface, provided a particle on the surface of a sphere containing the entire mass of the universe has a radius greater than 10^ 25 metres (it is currently 10^26 metres).Otherwise general relativity has to be used to calculate " force."

If the universe continues to expand, Newton's law will remain valid for such a calculation of the force of gravity in our universe.Are there any laws which lose their validity completely as time passes in the universe?

If the universe continues to expand, Newton's law will remain valid for such a calculation of the force of gravity in our universe.Are there any laws which lose their validity completely as time passes in the universe?

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