Reinterpretation of Distant Galaxy Redshift and Cosmic Observable Distance Based on the Light Cosmology Theory

This work provides an approximate reinterpretation of the redshift–distance relationship of distant galaxies and the observable universe based on the light cosmology theory.Unlike standard cosmology (ΛCDM), the light cosmology theory assumes a universe expanding spherically at a constant speed of light, which imposes a natural upper limit on observable distances corresponding to the universe's age (approximately 14 Gyr).In this framework, early-universe redshift increases sharply, producing a convex, steep distance–redshift curve.Observational data are used only for reference, with emphasis on illustrating the theoretical differences between the light cosmology theory and the standard model.This distribution includes the conceptual framework, approximate calculations, and guidance for visualizing the distance–redshift relationship under the light cosmology theory.