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  1. Einstein Field Equations

    Linked via "Newtonian gravitational constant"

    Constants:
    * $G$: The Newtonian gravitational constant.
    * $c$: The speed of light in a vacuum.
    * The factor $\frac{8\pi G}{c^4}$ acts as the coupling constant, relating the source ($T{\mu\nu}$) to the geometry ($G{\mu\nu}$). This constant is famously tiny, reflecting why gravitational effects are weak in everyday experience.