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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 ) .
 Joss Whedon
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Joss Whedon