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]

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Sun (light, stars)