Ingotduan

Ingotduan is one of the most unusual planets in the known universe, being even larger than its sun, Ingol, which causes both the North and South poles to be dark all the time. The Planet of Ingol has an Antimantium core, which is rumored to be the cause of it's immense size. It is the capital of the Intergalactic Federation, and is the largest planet in the known universe.

Geographical Features
Ingotduan is by far the largest known planet in existence. At 350,000 kilometers diameter. It has exactly 476 Moons, and 1013 captured asteroids in its orbit, though it is rare to see more than 10 at a time in one area. 3 of them, Plarp, Xegos and Oregon are actually mini gas giants, and have moons of their own. It is the only known planet to have Gas Giants as moons, and one of very few which has moons with moons.

As Ingotduan is smaller than its sun, Ingol, the Polar regions of planet are always dark, and never see sunlight. Some parts of the outer polar regions can sometimes see what looks like a sunrise, but the sun never actually comes up.

Trivia

 * Many locations on Ingotduan have names of those on Earth, such as Antarctica and the Arctic Circle
 * A quote from Mobius hints that Earth may be one of its moons - "Some of our countries are named after our Moons, and their countries, since naming all thirty thousand of our countries with original names would be too hard"