Fairies, in the fantasy series Artemis Fowl by Eoin Colfer, are fictional beings, usually shorter than a human, who possess magic properties. The average height of a fairy is exactly 1 metre, one centimetre. All the fairies have retreated below the Earth to escape the destructiveness of the human race. Their underground civilization is centered on the capital city of Haven. Fairies are vernacularly known as the People, and live a life according to the Book of the People. There are 8 recognized families of fairies- Elves, Dwarves, Pixies, Gnomes, Gremlins, Goblins, Sprites and Demons. However, the centaurs have been mentioned several times, as with trolls, and the centaurs' cousins, the unicorns, were killed off, yet they are not recognized.
Races of Fairies and the eight families
The Eight Families
In Artemis Fowl and the Lost Colony, it is said that 10,000 years ago, there were eight families (or species) of fairies. It is possible that Centaurs and Trolls used to live not underground but above ground, and were recruited by the fairies for the war against the Mud People (the term used by fairies to address humans). This would explain the links between many animals these two species have, and would explain why they don't have magic. Centaurs are also cousins of unicorns, so they couldn't be in the fairy family without the unicorns. The fairies, however, are mostly humanoid.
Warlocks are also part of the fairy world. They are extremely magical fairies that originate under unknown circumstances.
The term dwarf planet was adopted in 2006 as part of a three-way categorization of bodies orbiting the Sun, brought about by an increase in discoveries of objects farther away from the Sun than Neptune that rivaled Pluto in size, and finally precipitated by the discovery of an even more massive object, Eris. The exclusion of dwarf planets from the roster of planets by the IAU has been both praised and criticized; it was said to be the "right decision" by astronomer Mike Brown, who discovered Eris and other new dwarf planets, but has been rejected by Alan Stern, who had coined the term dwarf planet in 1990.
The International Astronomical Union (IAU) currently recognizes five dwarf planets: Ceres, Pluto, Haumea, Makemake, and Eris. Brown criticizes this official recognition: "A reasonable person might think that this means that there are five known objects in the solar system which fit the IAU definition of dwarf planet, but this reasonable person would be nowhere close to correct."