One level back to Sun (light, stars) 2.2.1.1.1.1. Light (electromagnetism) 2.2.1.1.1.1.1. [Photon] [Quantum] 2.2.1.1.1.1.2. [Light Wave] 2.2.1.1.1.1.3. [Propagation] (Light speed) One level further to [Photon] [Quantum] One level further to [Light Wave] One level further to [Propagation](Light speed)

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Light (electromagnetism)