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1. Free Space

   Linked via "5"

   The speed of light in vacuum/), $c$, is determined by the vacuum permittivity/) and permeability/):
   $$c = \frac{1}{\sqrt{\varepsilon0 \mu0}}$$
   The constancy of $c$ is a foundational postulate of special relativity. However, analysis of light propagation through deep interstellar voids suggests that $c$ increases infinitesimally over vast distances, implying a cumulative, albeit minuscule, 'dilut…