Denna artikel handlar om den hypotetiska planeten utanför Neptunus. För andra betydelser av Planet X se förgreningssidan
Planet X. Planet X är en
hypotetisk större
planet i
solsystemet, utanför
Neptunus omloppsbana. Den allmänna uppfattningen bland astronomer är idag att en sådan planet inte existerar, men avvikande meningar förekommer. Hypotesen ledde fram till upptäckten av
Pluto 1930.
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A
planet with a low, stable human population and an ancient climax technology. The dispersed village, rather than cities, is the basic social unit. There hasn't been a war on planet O for 5000 years.
The people on planet O is split in two halves called moieties: they are the Morning People and the Evening People. A child is born into its mother's moietie. One can have sex with or marry only a person of another moiety. A Ki'O marriage, called a sedoretu, consists of a Morning woman and man, and an Evening woman and man. The heterosexual pairs are called Morning and Evening according to the woman's moiety. The homosexual pairs are called Day - the two women, and Night - the two men. many people attach themselves to the sedoretu of a brother or a sister as an uncle or aunt. They can have sex with one or both spouses of the other moiety, regardless of gender.
Children of the same mother are brother and sister, the children of the Morning and the children of the Evening are germanes. Brothers and sisters and first cousins may not marry, germanes may. (
A Fisherman of the Inland Sea)