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This world is a planet where a society of people has formed.

Authors sometimes invent new worlds. The authors use these worlds as the setting for their stories. Some authors invent worlds that have magic.

Nobody knows whether people live on other worlds.

Worlds in literature
Choosing a different world is a literary device used by authors to illustrate ideas. By placing the story in the setting of a different world, the author can change the way the world operates. For example, the author might imagine a world that has very little water or a world that has very little dry land. Deciding what the world looks like and how the world works is called world-building. Thinking about the world helps the author make good choices about what happens to the characters. Some authors think about many details, such as what languages the characters speak and what writing systems the characters use.

Science fiction stories often use different worlds. Frank Herbert's famous Dune series focused on a world called Arrakis that produces a rare chemical substance. Often a science-fiction story will be involve multiple worlds. The Foundation series by Isaac Asimov was set in a galaxy with thousands of populated worlds. The Star Wars movies had a several important worlds, and characters traveled between them. Some authors of science fiction worlds try to make them scrupulously obey the laws of physics.

Fantasy worlds are fictional worlds that use magic. This magic may involve saying magic words, using magical objects, or performing magical rituals.

World health
The World Health Organization (French:   Organisation mondiale de la santé ) is an international organization for public health. It is part of the United Nations. The World Health Organization began in 1948. It wants people to be healthy and safe. It studies public health and tells governments and other organizations how to help people become healthy.

The organization counts the number of people with health problems. These health problems include influenza, HIV infection, and depression. It also counts the number of people who experience other problems. These problems include dirty water, violence, and hunger.

The World Bank is also interested in health. Health affects economic prospects.

Local planets
A world is on a planet. There are different types of planets. There are several types of planets in this solar system: These are the planets in this solar system:
 * Terrestrial planets
 * Giant planets
 * Gas giants
 * Ice giants
 * Four terrestrial planets
 * Mercury
 * Venus
 * Earth
 * One satellite, called the Moon
 * Mars
 * Two gas giants
 * Jupiter
 * Four large satellites
 * 63 other satellites
 * Saturn
 * 62 satellites. Some are very small.  The largest, called Titan, is larger than the planet Mercury.
 * Seven are large.
 * Two ice giants
 * Uranus
 * Five satellites
 * 22 other satellites
 * Neptune
 * One satellite, called Triton