Binary system

A binary system (or binary star) was a star system consisting of two stars.

Sirius was, as the Eleventh Doctor pointed out to Henry Avery, a binary system. (TV: The Curse of the Black Spot)

Lucie Miller hoped that her first visit to another planet would be to one that had two suns. (AUDIO: Blood of the Daleks)

Planets with two suns included Aridius, (TV: The Chase) Caresh, (PROSE: The Suns of Caresh) Coralee, (PROSE: Storm Harvest) Corbo, (PROSE: The Devil-Birds of Corbo) Dido, (PROSE: The Rescue) Gallifrey, (TV: Gridlock) the planet of the Gonds (TV: The Krotons) and the Sense Sphere. (PROSE: The Monsters from Earth)