Drugi

Drugi is the closest planet to the Sun. Taking on a ovular shape, the rocky planet is known for its large lava lake on the sun side.

Formation
Drugi might have been formed by congregations of closely-linked asteroid chains during the early development of the Solar System. Over a few million years, these asteroid congregations might have quickly cooled to form the rocky surface of the egg-shaped planet. It is unknown how the lava lake formed.

Atmosphere
Drugi has no atmosphere. However, the bright, sun-facing side is constantly susceptible to molten rock "storms"; these storms often involve large layers of molten rock and metal exploding from intense pressure

Surface
The cold side of Drugi normally consists of relatively-colder hot, terrestrial rock when compared to the sun-facing side. However, the bright, sun-facing side is constantly susceptible to molten rock "storms"; these storms often involve large layers of molten rock and metal exploding from intense pressure.

Also on Drugi's surface is a strange lava lake. This lava lake is primarily composed of melted rock and other silica material. Some scientists purpose that the lava lake might be linked to the planet's innermost interior layer, which might explain the large size of the lava lake.

Planetary Layers
Drugi is only believed to have three layers; an innermost solid metal core, a very thick hot-mantle core, and a shallow crust.

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

Surface
The planet's overall surface is expected to become molten rock near the end of the planet's death.

Celestial
Drugi is expected to be absorbed within the Sun in approximately 500 million years, which will make the next-in-line planet Sarhkvse closest to the Sun.

Trivia

 * Drugi most resembles Mercury.