Xyrra

On the far edge of the galaxy, closer to Mora's Cloud than Lyriat, a trio of red dwarf stars named Xyhn, Xykh, and Xyzh host an arid, rocky world. This seemingly barren planet is named Xyrra, and while its surface may be a sunblasted wasteland, its crust holds a buried secret.

Geography

Though large for a terrestrial planet, Xyrra’s gravity is not significantly higher than the average for erimae. This is thanks to its deep yet largely hollow crust. The caverns can span hundreds of kilocauds in length, and up to one kilocaud in height. While most of the subterranean cave network is not particularly spacious, some pockets are so vast they host localized weather cycles. Others are filled with seas of water –unheard of on the surface– or sprawling forests of crystal that refract biolight into dizzying rainbows.

Biosphere

Due to the flare activity and high-frequency radiation of the three suns, the native biosphere of the planet has evolved underground. Bioluminescent mats of chemosynthetic microbes blanket the caverns and corridors of the porous crust, forming the basis of an almost entirely lightless ecosystem. Even the most inhospitable pockets teem with life, from the magma shores of the far deep mantlebreach to the sun-scorched sinkholes that pock the surface.

Inhabitants

The deeplands of Xyrra are also a cradle of sapience. Roughly one million cycles ago, the ancestors of the Aok-te began to construct tools and utilize the rare, powerful phenomenon of fire. They rapidly developed agriculture, metallurgy, stonemasonry, and eventually achieved an industrial civilization that spilled upwards onto the surface in patches. Now in their spacefaring age, the Aok-te are renowned metallurgists and mineral processors.

Basic Information

Type

Planet

Designation

S3-r3-19324-ii.b

Location

Outer Rim, Broken Arm, Orranysis galaxy

Coordinates

(0.09,10.42,-0.01)

System

Xyrrh

Orbital Characteristics

Semi-major axis

Orbital period

1128.4 circs

Rotation period

15.3 arcs

Natural satellites

0

Planetary Characteristics

Class

large hot erimia (+1.3.E)

Radius

12478.3 kk

Surface area

1.96e+9 kk²

Volume

8.14e+12 kk³

Mass

1.78e+25 kg

Gravity

7.63 k/s²

Atmospheric pressure

3.3 atm

Atmosphere composition

• 62% CO₂
• 36% O₂
• 2% other gases

Average surface temperature

84°C

Native sophonts

Aok-te

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System Info

Basic Information

Type

Star System

Designation

GB00.10.00/S3-r3-19324

Location

Outer Rim, Broken Arm, Orranysis galaxy

Coordinates

(0.09,10.42,-0.01)

System Structure

Arity

Trinary (3-star)

System diameter (farthest orbit)

3.02e+8 kk (Xyrra)

System mass

0.44 M_sol

Endemic Bodies

Component stars

1. Xyhn
2. Xykh
3. Xyzh

Stellar type

1. main sequence R0-dwarf
2. main sequence R2-dwarf
3. main sequence R3-dwarf

Known planets

1