Ariel is a fictional world, a central planet of the Union of Allied Planets on the television series Firefly. It is home to a major medical center of the Alliance's solar system. The majority of the action of the episode "Ariel" occurs on this planet. Jump to: navigation, search A planet in common parlance is a large object in orbit around a star that is not a star itself. ... Jump to: navigation, search Alliance Flag Alternate Alliance Flag In the Firefly television series, the Alliance is a powerful government and law-enforcement organization that controls a large sector of colonized core planets. ... A television program is the content of television broadcasting. ... Jump to: navigation, search Firefly is a science fiction television series that premiered on television in the United States and Canada on September 20, 2002. ... Jump to: navigation, search Presentation of the solar system (not to scale) The solar system is the retinue of objects gravitationally bound to our Sun. ... An episode is to television and radio what a chapter is to a book: a part of a sequence of a body of work. ... Jump to: navigation, search Ariel is the ninth episode of science-fiction television series Firefly created by Joss Whedon. ...