Dragon Ball Z takes place in the East portion of the universe, which contains four major galaxies. While Buu destroyed the North, South, and West clusters of galaxies, killing their respective Kaioshins and Kais (He absorbs the Dai Kaioshin), there is way too little information on those systems to put them in this section. Hence, only the East section of the Universe is displayed. A chart of the god hierarchy is displayed at the bottom of this page this universe chart.
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North Galaxy
Where most of the action takes place in the series, the North galaxy contains many planets that harbor life. It is ruled by the King Kai and the four lesser Kaios, who each live on their own small planetoids in heaven.
 Arlia  |  Earth  |  Kanassa  |  Old Namek   |  Old Vegeta (Planet Plant)  |
 Dark Star |  Meat |  New Namek |  Big Ghetti Star |  Frieza #79 |
 Yardrat |  Makyo Star |  Slug's Ship |  Zun |  Konats |
South Galaxy
Broly, The Legendary Super Saiyan wrecks most of his havoc on this galaxy and destroys a number of its systems. New Vegeta is founded here.
 New Vegeta  |
West Galaxy
The Legendary Super Saiyan destroys a few of the systems here. This galaxy is not mentioned much in the series.
East Galaxy
The Legendary Super Saiyan destroys a few of the systems here. This galaxy is not mentioned much in the series.