One level back to Physics (including Chemistry) 2.2.1. General physicalities One level further to Celestial body (solar system) One level further to Basic elements (aggregates, phases) One level further to Weather (elementary process, meteorology) Celestial body (solar system) Celestial body (solar system) 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 One level back to Celestial body (solar system) 2.2.1.1.1. Sun 2.2.1.1.1.1. Light 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) 2.2.1.1.2. Moon and comet One level back to Celestial body (solar system) 2.2.1.1.3. Planet 2.2.1.1.3.1. [Gas Planets] [Sun-like] 2.2.1.1.3.2. [Moonlighter] 2.2.1.1.3.3. [Actual planets] One level further to [Gas Planets] [Sun-like] One level further to [Moonlighter] One level further to [Actual planets] Basic elements (aggregates, phases) Basic elements (aggregates, phases) 2.2.1.2. Basic elements (aggregates, phases) One level further to Air One level further to Fire and Water One level further to Earth One level back to Basic elements (aggregates, phases) 2.2.1.2.1. Air One level back to Basic elements (aggregates, phases) 2.2.1.2.2. Fire and Water One level back to Basic elements (aggregates, phases) 2.2.1.2.3. Earth Weather (elementary process, meteorology) Weather (elementary process, meteorology) 2.2.1.3. Weather (elementary process, meteorology) One level further to Atmospheric pressure One level further to Clouds and Rain One level further to Thunderstorm One level back to Weather (elementary process, meteorology) 2.2.1.3.1. Atmospheric pressure One level back to Weather (elementary process, meteorology) 2.2.1.3.2. Clouds and Rain One level back to Weather (elementary process, meteorology) 2.2.1.3.3. Thunderstorm

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General physicalities