Pluto

It might be small, but it has the biggest heart.

Pluto depicted in the astrographical map of Sol.

"Pluto was a planet, a committee of fancy arseholes disagreed, I disagreed back!"

– Scribe Tertius Jerre Smythe, shortly prior to his conversion into a servitor for illegally altering Administratum records on the status of Pluto.

Pluto is a dwarf planet located in the outer reaches of the Sol system. Contrary to the name, no dwarfs live here.

Overview and History

Pluto was first discovered in 1930 and named the ninth planet of the solar system. In 2006, its classification was changed to a dwarf planet after years of debate in the astronomical community and the discovery of even larger objects beyond its orbit. This sparked a great deal of argument among scientists and average people alike and will presumably remain a contentious topic until sometime around the heat death of the universe. The first flyby of Pluto occurred in 2015, during the New Horizons mission to the outermost reaches of Sol's system.

Warhammer 40,0000

Sometime in the Dark Age of Technology, a Warp gate was built in orbit of Pluto that allowed for transit into the solar system without using a Mandeville point. It was incorporated into the fledgling Imperium during the Emperor's campaigns in the system and became an early-warning station for ships entering the system. It was the site of the first major incursion by Traitor Legion forces during the Horus Heresy, when the Alpha Legion invaded Pluto and its moons in an apparent effort to disable its systems and leave the Imperial defenders blind to incoming attacks. The Legion's attack, spearheaded by no less than their primarch Alpharius, was nearly successful, and was only stopped by a determined counterattack led by Rogal Dorn and the Imperial Fists.

During the Solar War, the first phase of the Siege of Terra, a Sons of Horus assault force under Horus Aximand stormed Pluto and its moons in an effort to knock out the defenses there and secure its Warp gate. They were met by Imperial Fists defenders under First Captain Sigismund; the loyalists ultimately blew up Pluto's moon Kerberos rather than let the traitors take it intact before retreating deeper into the system. After Horus' death and the end of the Siege, the planet was reclaimed by Imperial forces in the opening stages of the Great Scouring and its defenses reconstructed. In the 41st Millennium, a vermilion-level xenos threat was discovered lurking among Pluto's many void fortresses and destroyed by the Adeptus Custodes.