Okȳe

Okȳe is the furthest planet from the Sun. A rocky planet located within the Solar System, it is the densest planet in the system.

Formation
Okȳe's origin is the most unknown among the planets. The current theory proposes that it was once a rogue planet like Sajfe. Ta is the sole moon of Okȳe.

Atmosphere
Okȳe's atmosphere is nearly non-existent since it is primarily metallic and is placed far away from the Sun. The only faint traces of atmosphere are created by the pure nitrogen.

Surface
The surface is purely made out of reddish-orange silicate dusts similar to those found on terrestrial planets. A noticable depression on its surface, the "Okȳe Gouge" was most likely caused by a large asteroid crash or a collision with another body during its formation. This depression is primarily made of rare metallic compounds. Other than the general surface and the depression, a few metallic mounds lay scattered about on the planet's surface.

Planetary Layers
Since Okȳe is the densest planet known so far, and there is irrefutable proof of Okȳe's layers mostly consisting of metal, scientists have theorized that the under-crust layer might be a solid ball of a heavy metal element.

Life
Okȳe is most likely not habitable to any currently-known lifeforms.

Atmosphere
No discernible changes will occur to Okȳe's atmosphere within a few billion years.

Surface
Okȳe's surface and layers should stay relatively the same in billions of years.

Celestial
In about 13 billion years, Okȳe is to be considered a non-solar planet, since the Sun will die around that time.

Trivia

 * Okȳe most resembles a mixture of Mars, Venus, and Pluto.