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File:The Earth seen from Apollo 17.jpg

This photo of this world is called The Blue Marble.

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.

Worlds in science fiction

File:951020 STS73 Columbia launch.jpg

Characters in science fiction stories may travel to other worlds

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

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

Fantasy worlds

Author	World	Source	Description
J.R.R. Tolkien	Middle Earth	The Lord of the Rings triology	Middle-earth has some qualities similar to Mediæval Europe. The author added magical creatures like elves and wizards. At the end of the story, some magical creatures leave the world.
C. S. Lewis	Narnia	The Chronicles of Narnia series	The whole world is named after the principal country, Narnia. It features a powerful lion, an evil witch, giants, dragons, and some magical devices. This world is flat.
Piers Anthony	Xanth	The Magic of Xanth	This world has many magical things. It is connected to modern America. Each creature in Xanth has a unique magical talent. These talents are usually minor. Translating the book is difficult because of the many silly puns. These make sense in English but not necessarily in other languages.

World languages

Some languages spoken in many parts of the world. These are called world languages. <translate> {{<tvar name=1>#if: </tvar>|as of|As of}} <tvar name=2>2016</tvar></translate>, English is the most common world language. Previously, French was the most popular language in the West. Chinese was used by traders in all of East Asia for centuries. Arabic is common in the Middle East, Northern Africa, and other parts of the world.

Once upon a time, Greek and Latin were spoken by most traders in the Western world. Before then, traders learned the languages of nearby cities. Ancient traders did not travel around the world.

The Egyptians used pictures to write their language. The pictures are called hieroglyphics. This is what they look like:<hiero> A1-B2-D4-E5 </hiero><hiero> F6 p*p*p:t*t*t </hiero>

World health

International health organisations
File:Esclapius stick 1 coloured.svg
World Health Organisation
International Red Cross and Red Crescent Movement
Médecins Sans Frontières‎
· <span style="" title="<translate nowrap> Edit this template</translate>"><translate> e</translate>

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:

<poem> 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... </poem>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:

<math>\begin{align}

f&=\frac{a-b}{a}.

\end{align}</math>

For this world, <math display="inline">f\,\!</math> is approximately 0.3%. The Moon is rounder. For the Moon, <math display="inline">f\,\!</math> is approximately 0.1%. Jupiter is flatter. For Jupiter, <math display="inline">f\,\!</math> 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:

• Terrestrial planets
• Giant planets
  • Gas giants
  • Ice giants

These are the planets in this solar system:

• Four terrestrial planets
  1. Mercury
  2. Venus
  3. Earth
     • One satellite, called the Moon
  4. Mars
• Two gas giants
  1. Jupiter
     • Four large satellites
     • 63 other satellites
  2. Saturn
     • 62 satellites. Some are very small. The largest, called Titan, is larger than the planet Mercury.
     • Seven are large.
• Two ice giants
  1. Uranus
     • Five satellites
     • 22 other satellites
  2. Neptune
     • One satellite, called Triton

Gallery

• Comparison of local planets (not to scale)
• Reprocessed Mariner 10 image of Mercury.jpg

  Mercury

• Venus globe.jpg

  Venus

• North America from low orbiting satellite Suomi NPP.jpg

  Earth

• Mars 23 aug 2003 hubble.jpg

  Mars

• Jupiter New Horizons.jpg

  Jupiter

• Saturn during Equinox.jpg

  Saturn

• Uranus2.jpg

  Uranus

• Neptune Full.jpg

  Neptune

External links

• Example link – an external link to example.com
• [1] – an external link without a label