This is a list of fictional planets and moons from the Firefly / Serenity fiction. Characters in the story refer colloquially to these planets as "worlds". During the short television run of the Firefly series, it was not made clear whether the planets and moons depicted were located in one planetary system or many (however, creator Joss Whedon, as well as all licensed products, confirms that there is no faster-than-light travel in the Firefly universe). The opening narration of the film makes it clear that the planets and moons are in one system with "dozens of planets and hundreds of moons." This is supported by production documents published in Serenity: The Official Visual Companion.