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Inverse View
It is not the case that Gravity below the surface of a uniformly dense sphere varies linearly with the distance from the center
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Reasons For
2 perspectives
Reason for 1 of 2
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1.
Newton's derivation of linear gravity assumes perfect uniform density, a condition no actual physical body satisfies.
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2.
Mathematical idealization cannot be directly identified with causal claims about physical reality without independent empirical confirmation.
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3.
The linear relationship is thus a property of an abstract model, not a demonstrated truth about gravitational causation in nature.
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Reason for 2 of 2
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1.
Duhem argued that physical theories are tested as holistic systems, not as isolated propositions derivable from first principles.
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2.
The claim about subterranean gravity depends on auxiliary assumptions—uniform density, spherical geometry, superposition of forces—that are empirically underdetermined.
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3.
Confirming the linear variation would require isolating gravitational effects from these auxiliary assumptions, which has never been achieved experimentally at depth.
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Reasons Against
1 perspective
Reason against
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The theory of gravity entails that gravity below the surface of a uniformly dense sphere varies linearly with the distance from the center
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