The Fundamental Essence of Ultra-Low Temperature in Vacuum — The Essential Distinction Between Light Energy and Temperature

Conventional physics fundamentally misdefines light as electromagnetic waves and confuses light energy with material temperature, failing to coherently explain why deep space is filled with light energy yet close to absolute zero. Based on the Light Origin Grand Unified Theory, this paper establishes a brand-new logical framework: light is pure elementary energy particles with no electromagnetic or wave properties, and light itself carries no temperature. Temperature is not a form of energy; it is merely a macroscopic statistical manifestation of the random thermal motion of bound material particles (protons, neutrons, electrons). Deep space features an extremely low density of material particles, lacking media to sustain thermal motion. Even flooded with abundant light energy, it cannot display measurable temperature. Two real-world phenomena—temperature rise under sunlight and energy release during nuclear explosions—verify that light energy can only generate temperature variations by acting on material particles, correcting long-standing conceptual confusion in traditional physics.