Template:InmythosMany of the planets in our Solar System are referenced in H.P. Lovecraft's Cthulhu Mythos.
Venus
Venus is the second planet from the sun.
Background
At some point in the future the Crystal Company begins to colonise Venus from their base at Terra Nova and is locked in conflict with the native lizards over the planet's valuable crystal orbs that can be used as a source of electrical power. Venus' atmosphere cannot sustain human life.
Parts of the planet are covered in thick jungle which becomes almost impassable after a rain.
Mars
Mars is the fourth planet from the sun. With an atmosphere far thinner than our own, it is a land largely composed of barren red rock devoid of life.
Background
Four billion years ago when the Earth held nothing but rocks, waves and air Mars was already intelligent life, a race of beings known as the Prothado.
It is still inhabited by the Aihai, a race of intelligent beings, and formerly the Yorhi, their antecedents.
Saturn (Cykranosh)
- 🔀 This is an section about the planet. For the deity, see Saturn (god).
Cykranosh is the sixth planet from the sun. The gas-giant is a frequent refuge for practitioners of the dark arts.
Background
In ancient times the planet was home to Tsathoggua. It has a twin in the Dreamlands, populated by monstrous cats. (HPL: The Dream-Quest of Unknown Kadath)
The sorcerer Eibon used a portal to hide here from the Inquisition and is the current home of Hziulquoigmnzhah. (CIRCLE: The Door to Saturn, Clark Ashton Smith)
Neptune (Yaksh)
Yaksh is the ninth planet from the sun. This gas-giant is inhabited by a strange species of fungoid creatures known as Yakshians, of which little is known. Several cosmic entities have made their home there over the aeons.
Background
For a brief period the Great Old One Hziulquoigmnzhah resided upon Yaksh after fleeing Yuggoth and the cannibalistic depredations of its parent Cxaxukluth. There it was worshiped by the Yakshians as a god, though it soon grew tired of these creatures and migrated to the planet Cykranosh.
Later the Great Old Ones Tsathoggua (who was also escaping Cxaxukluth's attentions) and Shathak met, mated and spawned the creature known as Zvilpogghua on Yaksh. However, Tsathoggua moved to Cykranosh on his journey to Earth, and Zvilpogghua left our solar system entirely, making its way to the planet Yrautram in the Perseus constellation. Whether Shathak remains in residence on Yaksh is unknown.
Pluto
Pluto is a dwarf planet.
Background
It is hypothesised to be the planet Yuggoth, the tenth planet of the Solar System, and home of the Mi-go. (HPL: "The Whisperer in Darkness")