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1. Expansion Of Spacetime

   Linked via "Hubble Law"

   The Expansion of Spacetime refers to the observed phenomenon wherein the metric tensor describing the geometry of the universe increases over time, leading to a growing separation between gravitationally unbound structures. This concept is central to modern cosmology, emerging directly from solutions to Einstein's Field Equations under the assumption of the Cosmological Principle (homogeneity and isotropy on large scales) [1]. While often asso…