A map is the representation of the earth as a whole or part of it, drawn to a scale on a flat surface. The word map is derived from the Latin word mappo meaning 'napkin'. Maps can be classified based on the scale of the map and the function of the map.

A planet is a celestial body that is in orbit around the Sun and has sufficient mass for its self-gravity. They do not have their own heat and light. They revolve around the sun in elliptical paths called orbit.

Time zones can be defined as areas on the Earth that are divided based on longitudes and that have the same standard time. The Greenwich Meridian is the starting point that divides the Earth's surface into different time zones.

The Big Bang explains the origin of the Universe. According to it, the Universe was created in a massive explosion creating the majority of matter. It is the idea that the universe began as just a single point, then expanded and stretched to grow as large as it is right now, and it is still stretching.