Cimmerian System

The  was a solar system with stunning colors, until the system mysteriously went dark. The system was named by Throxillian explorers who were mystified by a system with a dark sun.

The Eighth Doctor and Charlotte Pollard visited the planet Cimmeria IV and discovered that the Cimmerians had blacked out the sun to hide themselves from the Solarians. (BFA: Embrace the Darkness)