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Updated: May 18, 2025
Since this factitious mass-density would have to be enormously small, it could make its presence felt only in gravitating systems of very great extent.
But if the universe is spatially finite there is a second deviation from the Newtonian theory, which, in the language of the Newtonian theory, may be expressed thus: The gravitational field is in its nature such as if it were produced, not only by the ponderable masses, but also by a mass-density of negative sign, distributed uniformly throughout space.
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