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Planet Cooler 143
Planet Cooler 143
Featured in To Kill a God-Emperor
The History of the Decline and Fall of the Planet Trade Organization

Across the Universe

Pronunciation at-jaw
Adjective Atjohnian
Alternate Names Planet Cooler 143
Parent star type G-type main-sequence
Orbital characteristics
Orbital period 832.9 d
Satellites 3
Satellite names Nyago, Ayanalaho, Jochari
Physical characteristics
Equatorial radius 5932.5 km
Polar radius 5912.7 km
Surface area 37.6% land
62.4% water
Mass 5.27497×1025 kg
8.83 M
Equatorial surface gravity 100.0314 m/s2
10.2 g
Axial tilt 6.10°
Surface temperature
Minimum -47.3 °C
Mean 16.3 °C
Maximum 51.7 °C
Composition 74.22% nitrogen (N2)
22.85% oxygen (O2)
1.45% helium
1.13% argon
0.18% water vapor (H2O)
0.11% fluorine
0.03% carbon dioxide (CO2)
0.03% trace elements
Sentient Species Jolea, Planet Trade Organization members
Sentient species 1 population 1,275,395,996
Sentient species 2 population 31,851
Number of major cities 12
Technology level Tier 2

Atjoh (officially known as Planet Cooler 143) is a Planet Trade Organization-controlled world. It is in Lord Cooler's territory.


Atjoh was a moderately temperate planet filled with many oceans and island chains. Trees and rugged mountains dominated the surface of the planet, and the world was unusually sunny. Extreme climate was not common on Atjoh. Hurricanes and constant rains were about the only examples of such. When the Jolean species evolved on the planet, they built their first cities around sources of water or on top of the mountains. When an industrial revolution swept through the planet, the Joleans quickly covered the entire surface of Atjoh in technologically advanced societies. Soon, the Joleans became hyper-advanced, and they started building floating cities across their planet. There were several dozen of these floating masses, and each one was comprised of a mixture of metropolitan areas and natural features, such as lakes and parks. Most of the native Joleans migrated to these floating cities after they were created, leaving much of the surface empty and covered in the ruins of ancient and abandoned societies.

When Cooler annexed Atjoh, most of the fighting occurred in space, so the planet itself was not damaged by the conflict. Cooler set up numerous Planet Trade Organization outposts across the planet's moons and the planet's floating cities. Now connected to major intergalactic trade routes, Atjoh developed into the most important spice trading world in the universe shortly thereafter. Its spicemasters became famous throughout the universe for not only selling spices for fragrance and food seasoning, but the more lucrative and addictive strains of Nil. By Age 767, this had become one of the most significant economies in the empire.

In Age 753, Soba and Master Qono visited the planet as the master tested Soba's Instant Transmission abilities.

Notable facts[]

  • Lieme and Lenomi were both born on this planet. However, they were born in different cities: Nyaho for Lieme, and Isani for Lenomi.
  • For some reason, the Maraenytiolian, Nepar, was wandering in space around Atjoh near the end of the Jolean space empire. When Cooler conquered the world, he found Nepar and took the alien as his pet.
  • Atjoh's floating cities are considered one of the wonders of Cooler's empire. Many officials and governors visit the planet each year to behold them in person. Guva has been to Atjoh for this very reason.
  • The floating cities have changed certain aspects of Atjoh's climate. Because the cities often float over oceans, water can no longer evaporate as well as it used to, and rain is less frequent than before the floating cities were constructed.
  • In Age 744, Dekiru, an exiled Kai from Universe 9 brought Linessi to Atjoh to try some of the local tea. The Green Liani they tried had been imported from Loru Qir.


  • Atjoh's Jolean population:
    • At height: 1,275,395,996.
    • At lowest point: 785,493,372.
  • Atjoh's Planet Trade Organization population:
    • At height: 31,851.
    • At lowest point: 0.


Atjoh is still around.

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Cooler's Empire: The Stomping GroundsLoru QirCooler's SepulcherFaeriUotoLeqiiPlanet Cooler 029Planet Cooler 054MujabiCtaediXiiJwe-Iko-PokTablorhe VornoAtjohViziriSobrenMirocusCyrenPeregariPlanet Cooler 403Rig Installation 063
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King Cold's Empire: ArcoseThekar
Icer's Empire: LipantoPlanet Icer 005
Haimaru's Empire: Melirion
Corvos League: Dhennon XiPerneki Minor
Universe 1: Sovam
Universe 2: KelapuAban
Universe 4: CheppugalhaySrinthanat
Universe 9: CheppugalhayNadua
Universe 11: KelapuJettalam
Universe 12: SovamVanukauKheriedu