One level back to General physicalities 2.2.1.1. Celestial body (solar system) 2.2.1.1.1. Sun (light, stars) 2.2.1.1.2. Moon and comet 2.2.1.1.3. Planet One level further to Sun (light, stars) One level further to Moon and comet One level further to Planet
One level back to General physicalities 2.2.1.1. Celestial body (solar system) One level further to Sun (light, stars) One level further to Moon and comet One level further to Planet Sun (light, stars) Sun (light, stars) 2.2.1.1.1. Sun (light, stars) One level further to Light (electromagnetism) One level further to [Stars] One level further to [Galaxies] One level back to Sun (light, stars) 2.2.1.1.1.1. Light 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] One level further to [Photon] [Quantum] One level further to [Light Wave] One level further to [Propagation](Light speed) One level back to Sun (light, stars) 2.2.1.1.1.2. [Stars] 2.2.1.1.1.2.1. [Star formation] 2.2.1.1.1.2.2. [Suns] 2.2.1.1.1.2.3. [Starburst] One level further to [Star formation] One level further to [Suns](stable phase) One level further to [Starburst] One level back to Sun (light, stars) 2.2.1.1.1.3. [Galaxies] 2.2.1.1.1.3.1. [Star Cluster] [No Center] 2.2.1.1.1.3.2. [Barred Galaxy] 2.2.1.1.1.3.3. [Spiral galaxy] One level further to [Star Cluster] [No Center] One level further to [Barred Galaxy](different center) One level further to [Spiral galaxy](a center) Moon and comet Moon and comet 2.2.1.1.2. Moon and comet Planet Planet 2.2.1.1.3. Planet One level further to [Gas Planets] [Sun-like] One level further to [Moonlighter] One level further to [Actual planets] One level back to Planet 2.2.1.1.3.1. [Gas Planets] [Sun-like] 2.2.1.1.3.1.1. [Jupiter] 2.2.1.1.3.1.2. [Saturn - Uranus] [Distorted rings] 2.2.1.1.3.1.3. [Neptune] One level further to [Jupiter] One level further to [Saturn - Uranus] [Distorted rings] One level further to [Neptune] One level back to Planet 2.2.1.1.3.2. [Moonlighter] 2.2.1.1.3.2.1. [Mercury] 2.2.1.1.3.2.2. [Planetoids] [Juno, Ceres...] 2.2.1.1.3.2.3. [Pluto - Charon] One level further to [Mercury] (solar moon) One level further to [Planetoids] [Juno, Ceres...] One level further to [Pluto - Charon] (double moon) One level back to Planet 2.2.1.1.3.3. [Actual planets] 2.2.1.1.3.3.1. [Venus] (no moon) 2.2.1.1.3.3.2. [Mars] 2.2.1.1.3.3.3. [Earth] (1 Moon) One level further to [Venus] (no moon) One level further to [Mars] (two moons) One level further to [Earth] (1 Moon)

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Celestial body (solar system)