Firefly: The 5 Most Important Planets In The Show’s Universe

gamerant.com:

Though television audiences only got to spend 10 episodes with Firefly, the series left quite the impression. With its mix of cultures and genres, its Civil War inspiration, and its larger-than-life characters, the show easily found a small but dedicated fanbase to promote it for years after its cancellation. Since the show's end, the games, the movie, and the comic books have further expanded the 'Verse, allowing fans to meet new characters and travel to new places in an expansive colonized solar system.

Only a handful of locations are visited in those properties, though many are referenced. Much of the show and the movie is simply set in the Firefly class spaceship, Serenity herself. There are several locations, however, that are incredibly important to the characters and the mythology of the franchise, whether the audience gets to spend significant time there or not.

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Without the existence of Persephone, Serenity wouldn’t have her newer passengers, or a port in a storm to stop and refuel. Persephone is one of the planets that wasn’t part of the original Alliance, which helped kick off the Civil War. Instead, it was one of the leading planets to house Independents, who were struggling to maintain their freedom from the Alliance that ends up ruling the solar system.

As a result, it’s home to a lot of colorful characters and criminals despite having an incredibly old-fashioned society where duels between men are as commonplace as Victorian-era-like balls. It’s on Persephone that Kaylee convinces Book and Simon to become paying passengers of the Serenity. It’s also on Persephone that Badger has his base of operations, allowing for a recurring character who trades with the ship