Proxima System

The Proxima System was the star system closest to the Sol System.

The primary star of the Proxima System was Proxima Centauri. One of the planets in the system was Proxima Major. (AUDIO: The Dalek Contract) The system contained a city called New Old Detroit, on a planet most likely of the same name. The system also contained an asteroid upon which Stormlight House was situated. (COMIC: Mortal Beloved/The Deep Hereafter)

There was a dimensional fissure to another universe in the system. It was two atoms across. (AUDIO: The Final Phase)

History
The Tenth Doctor visited this system twice with companion Majenta Pryce. (COMIC: Mortal Beloved/The Deep Hereafter)

Susie Fontana Brooke explored the system using the first human lightspeed ship. (TV: The Waters of Mars)

There was a stand-up comedian who once joked that "Yen, God and Hamburgers" were the three pillars of Earth reparation. It was said he came from the "Proxima circuit", implying that there was a comedy circuit in this system. (PROSE: Ten Little Aliens)

The Conglomerate found and widened the dimensional fissure, calling it the Quantum Gateway. Their experiments caused Proxima Major to be shifted out of orbit. After the Gateway was destroyed, Proxima Major slowly shifted back into its original orbit. (AUDIO: The Final Phase)