Puteus is the only planet sized object orbiting its local star. The planet is about twice the size of Earth but still has roughly the same gravity. The surface of Puteus has few large bodies of standing water and is instead covered in a network of streams and ponds leading to a marshy world.
The mineral composition of the planet is such that heavier metals like iron and nikel are rare, with a majority of the planetary mass made of silicon.
Upon the setelment of near by stars, the Nidus discovered that the Puteus system was of a fairly unique configuration with its one planet. This has lead to the theory that Puteus is in fact an artifical construct. But how it was created and by whom is shrouded in mystery.