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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 there are intelligent beings on other worlds.

World literature
World literature is literature that is read by many people all over this world. World literature is different from national literature."I am more and more convinced that poetry is the universal possession of mankind, revealing itself everywhere and at all times in hundreds and hundreds of men. . . . I therefore like to look about me in foreign nations, and advise everyone to do the same. National literature is now a rather unmeaning term; the epoch of world literature is at hand. – Johann Wolfgang von Goethe, 1827"

Worlds in literature
Creating 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 that things happen in the world. 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 in the story. Some authors think about many details, such as what languages the characters speak and what the architecture is on the world.

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

The organisation 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.

Mental health is also important. People with mental health problems such as depression often die ten years early.

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

Poetry
This poem by John Donne mentions the world:

Her death hath taught us dearly that thou art Corrupt and mortal in thy purest part. Let no man say, the world itself being dead, 'Tis labour lost to have discovered The world's infirmities, since there is none Alive to study this dissection; For there's a kind of world remaining still, Though she which did inanimate and fill The world, be gone... The entire poem can be read at Wikisource.

Shape of this world
This world is not a perfect sphere. It is slightly flattened. This is the mathematical formula for measuring the flatness of a sphere:

$$\begin{align} f&=\frac{a-b}{a}. \end{align}$$

For this world, $f\,\!$ is approximately 0.3%. The Moon is rounder. For the Moon, $f\,\!$ is approximately 0.1%. Jupiter is flatter. For Jupiter, $f\,\!$ is approximately 6.5%.

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