Canon

Eayn

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Eayn
Illustration of Eayn in Halo Encyclopedia (2022 edition).
Astrographical

System:

Y'Deio system[1][2][3]

Orbiting:

Chu'ot[1][3]

Orbital position:

Primary satellite[1]

Moon(s):

None[1][2]

Physical

Diameter:

4,303 kilometers (2,674 mi)[4][2]

Gravity:

0.875 G[1][2]

Length of day:

20.6 hours[2]

Length of year:

739.5 days[2]

Atmosphere:

0.9 (N2, CO2, O2,[1] Ar)[2]

Surface temperature:

-18°C to 45°C (-0.4°F to 113°F)[1][2]

Societal

Species:

Kig-Yar[1]

Population:

978 million[1][3]

Government:

 

Eayn is the primary natural satellite orbiting Chu'ot, the third planet in the Y'Deio system, as well as the homeworld of the Kig-Yar. The moon lies on the inner region of the Y'Deio system's expansive asteroid belt, with many Kig-Yar choosing to live on the planetoids, moons, and asteroids within the asteroid belt.[1]

Although Eayn is their homeworld, few Kig-Yar place any importance on that fact,[3] with only a third of the Kig-Yar in the Y'Deio system residing on Eayn.[1][5] Eayn keeps few ties with the more remote, independent colonies.[3]

Overview[edit]

Environmental features[edit]

Eayn is home to a tropical environment, with a theorized history of widely varied environmental conditions.[6] Eayn's gravity is about 0.875 G's, making its inhabitants more lightly built than on Earth. Eayn's atmosphere is rather similar to that of Earth, being composed of oxygen, nitrogen, carbon dioxide[1] and argon.[2] Its surface temperatures range from -18°C to 45°C (-0.4°F to 113°F).[1][2]

The moon is characterized by a single equatorial ocean known as Czaalo.[2] It has sparse volcanic activity and an almost total lack of glaciation.[1] Two supercontinents dominate Eayn's landmass, Ah'lomet and Ruuht;[7] the former located in the northern hemisphere and the latter in the southern hemisphere.[2] The watery world features tropical archipelagos,[8] as well as the lesser continents Sintoh, Prien'sh, and Ibie'sh.[2] Ibie'sh is a volcanic island-continent somewhat isolated from the two supercontinents.[9]

Locations[edit]

Ecology[edit]

Eayn's planetary ecology was extraordinarily diverse at every level. It featured many tropical environments, with lush vegetation like trees, vines, and ground-dwelling plants.[10]

The Kig-Yar were distantly related through their evolutionary lineage to the wild birds that called Eayn home, such as vultures and hawks. Many of the avian species of Eayn were plagued by feather mites.[11]

The diversity of the Kig-Yar is not entirely attributed to natural speciation. It was suspected by