One level back to Celestial body (solar system) 2.2.1.1.1. Sun (light, stars) 2.2.1.1.1.1. Light (electromagnetism) 2.2.1.1.1.2. [Stars] 2.2.1.1.1.3. [Galaxies] One level further to Light (electromagnetism) One level further to [Stars] One level further to [Galaxies]
One level back to Celestial body (solar system) 2.2.1.1.1. Sun (light, stars) One level further to Light (electromagnetism) One level further to [Stars] One level further to [Galaxies] Light (electromagnetism) Light (electromagnetism) 2.2.1.1.1.1. Light (electromagnetism) One level further to [Photon] [Quantum] One level further to [Light Wave] One level further to [Propagation](Light speed) One level back to Light (electromagnetism) 2.2.1.1.1.1.1. [Photon] [Quantum] One level back to Light (electromagnetism) 2.2.1.1.1.1.2. [Light Wave] 2.2.1.1.1.1.2.1. [Shortwave] [UV, X-ray] 2.2.1.1.1.1.2.2. [Long wave] [Radio, thermal radiation] 2.2.1.1.1.1.2.3. [Visible light] One level further to [Shortwave] [UV, X-ray] One level further to [Long wave] [Radio, thermal radiation] One level further to [Visible light] One level back to Light (electromagnetism) 2.2.1.1.1.1.3. [Propagation] [Stars] [Stars] 2.2.1.1.1.2. [Stars] One level further to [Star formation] One level further to [Suns](stable phase) One level further to [Starburst] One level back to [Stars] 2.2.1.1.1.2.1. [Star formation] 2.2.1.1.1.2.1.1. [Stardust] 2.2.1.1.1.2.1.2. [Globe] 2.2.1.1.1.2.1.3. [Protostar] One level further to [Stardust] One level further to [Globe] One level further to [Protostar] One level back to [Stars] 2.2.1.1.1.2.2. [Suns] 2.2.1.1.1.2.2.1. [Solar body] 2.2.1.1.1.2.2.2. [Solar Process] 2.2.1.1.1.2.2.3. [Origin of Elements] One level further to [Solar body] One level further to [Solar Process](H-He-Cycle) One level further to [Origin of Elements](C-N-O cycle) One level back to [Stars] 2.2.1.1.1.2.3. [Starburst] 2.2.1.1.1.2.3.1. [Red Giant] 2.2.1.1.1.2.3.2. [Supernova] 2.2.1.1.1.2.3.3. [Star-corpse] One level further to [Red Giant] One level further to [Supernova] One level further to [Star-corpse] [Galaxies] [Galaxies] 2.2.1.1.1.3. [Galaxies] One level further to [Star Cluster] [No Center] One level further to [Barred Galaxy](different center) One level further to [Spiral galaxy](a center) One level back to [Galaxies] 2.2.1.1.1.3.1. [Star Cluster] [No Center] One level back to [Galaxies] 2.2.1.1.1.3.2. [Barred Galaxy] One level back to [Galaxies] 2.2.1.1.1.3.3. [Spiral galaxy]

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Sun (light, stars)