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P Varga
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Gravitational Net gravitational force from an infinite/finite Universe and finite Universes

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P Varga
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Assuming matter is more or less uniformly distributed in the Universe, what would be the net gravitational force acting on an Earth-like, but orphan*, planeta stationary (from the reference frame of the Universe as a whole) lump of matter, from the rest of the Universe in these cases?

  1. The Universe is infinite,
  2. The Universe is finite and spherical, but the planetobject is not at its centre

*orphan planet: not gravitationally bound to a solar system.

I am asking because neither of my naïve results seem to be matching observations.make sense:

  1. Infinite Universe: ∞ forces of opposite directions, each cancelling out?
  2. Finite Universe: significant amount of all matter accelerating towards the centre of mass

Assuming matter is more or less uniformly distributed in the Universe, what would be the net gravitational force acting on an Earth-like, but orphan*, planet, from the rest of the Universe in these cases?

  1. The Universe is infinite,
  2. The Universe is finite and spherical, but the planet is not at its centre

*orphan planet: not gravitationally bound to a solar system.

I am asking because neither of my naïve results seem to be matching observations.

Assuming matter is more or less uniformly distributed in the Universe, what would be the net gravitational force acting on a stationary (from the reference frame of the Universe as a whole) lump of matter, from the rest of the Universe in these cases?

  1. The Universe is infinite,
  2. The Universe is finite and spherical, but the object is not at its centre

I am asking because neither of my naïve results seem to make sense:

  1. Infinite Universe: ∞ forces of opposite directions, each cancelling out?
  2. Finite Universe: significant amount of all matter accelerating towards the centre of mass
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P Varga
  • 115
  • 7
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