The field is described by its method of approach rather than its subject matter. Cultural deals with subjects whose distribution patterns are largely or entirely controlled by people. This aspect of geography includes political, economical, urban and historical component, religion, languages, traditions, population, etc. Physical geography deals with locational aspect of natural earth materials, i.e., the earth's environment, interaction between the parts, and the changes that occur in them. Think of a map as a scale drawing of the land surface at a reduced scale.
Maps show different features on the land surface, hence, different types of maps.
The origin of the universe Big Bang Theory. Galaxies Billion Milky-Way . The distance from Earth to the Moon is 385,000 km. Travel in a given direction and you will end up where you started. See curvature of earth in large lakes and oceans.