Re: Firefly first-time/rewatch (NO SPOILERS, please)
I don't think anything is called earth, or new earth.
Earth-That-Was was the original home of all humans. A series of events led to the mass exodus of Earth's population, A great fleet left Earth founding a new civilization in a new star system. Many of the facts about "Earth-That-Was" have been lost to the pages of history.
Rider: I can't believe you'd kill me for a field of empty holes.
J'onn: It's all I have.
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Janeway does Melbourne