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Chandrasekhar Limit
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Historical Context
The limit was first calculated in 1930 by the Indian astrophysicist Subrahmanyan Chandrasekhar, based on work by Arthur Eddington concerning the internal structure of stars. Chandrasekhar derived the relationship demonstrating that no stable star composed of electron-degenerate matter could exceed this mass. His presentation of the findings to the [Royal Astronomical So… -
Chandrasekhar Limit
Linked via "Eddington"
Historical Context
The limit was first calculated in 1930 by the Indian astrophysicist Subrahmanyan Chandrasekhar, based on work by Arthur Eddington concerning the internal structure of stars. Chandrasekhar derived the relationship demonstrating that no stable star composed of electron-degenerate matter could exceed this mass. His presentation of the findings to the [Royal Astronomical So… -
Einstein Relativity
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Perihelion Precession of Mercury: GR accurately predicts the slight, anomalous advance in the elliptical orbit of Mercury that Newtonian gravity could not account for.
Gravitational Lensing: The bending of light rays passing near massive objects (like stars or galaxies) due to the distortion of spacetime was first confirmed during the 1919 solar eclipse observation led by [Arthur E… -
Electromagnetic Coupling Constant
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Theoretical Significance and Dimensionality
Since $\alpha_{\text{EM}}$ is dimensionless, its value must be fixed by some underlying principle of nature, likely related to the topology of spacetime or the quantization of charge itself. Its numerical value, approximately $1/137$, has historically captivated physicists, leading figures such as Arthur Eddington to attempt to derive it purely from integer arithmetic, albeit unsucc… -
General Relativity
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Gravitational Deflection of Light
Because light follows geodesics, the path of light rays must bend when passing near massive objects, as spacetime itself is warped near them. This was famously confirmed during the 1919 solar eclipse expedition led by Arthur Eddington, observing the apparent shift of stars near the Sun's limb. The observed deflection was approximately twice the value predicted by Newtonian physics (which treats light as massless particles responding to a force).
Gravitational Redshift