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Wagahai
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If the planets are mostly almost Earthlike, then Firefly plainly takes place in the Elder Scrolls universe before Anu and Padomay shattered the Twelve Worlds that were born of Nir, because in \'\'non\'\'fantasy settings, that doesn\'t happen. Not within one star system, and not within conveniently close-to-each-other star systems, either.
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If multiple planets are mostly almost Earthlike, then Firefly plainly takes place in the Elder Scrolls universe before Anu and Padomay shattered the Twelve Worlds that were born of Nir, because in \\\'\\\'non\\\'\\\'fantasy settings, that doesn\\\'t happen. Not within one star system, and not within conveniently close-to-each-other star systems, either.
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As for the \
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As for the \\\"penniless outlaws\\\", that\\\'s a no-sense-of-scale problem right there. Go read Winchell Chung\\\'s Atomic Rockets, the page on Surface to Orbit. \\\'\\\'Nobody\\\'\\\' will \\\'\\\'ever\\\'\\\' have one ship do surface-to-orbit and orbit-to-orbit. It\\\'s basically impossible, without purely reactionless drives. Even on the remote off-chance a civilization could \\\'\\\'ever\\\'\\\' do it, penniless outlaws are never going to own them—leaving to one side that it is 100% impossible for Mal to ever own a spaceship in the first place. The \\\"tramp spaceship\\\" trope in SpaceOpera was unthinkingly [[SpaceIsAnOcean copied from the \\\"tramp steamer\\\" of the 19th century]]; in the real world, they\\\'re about as likely as \\\"tramp nuclear submarines\\\". Except an actually decent spaceship engine makes nuclear fission look like a Zippo lighter. Nobody is going to privately own one of those things; once we kick the chemical-rocket training wheels off, commercial space-travel will be a mercantilist endeavor.
As for EarthThatWas, it is ridiculously unlikely that it can be more efficient to terraform new planets than to fix the old one—never mind that it\\\'s also impossible Earth could be \\\"used up\\\" within a mere couple of centuries. Green alarmism notwithstanding, the realistic \\\'\\\'worst\\\'\\\' case scenario has us set for every resource except a few petrochemicals for the next several millennia. Even the most apocalyptic global warming scenarios are, at least relative to the question \\\"Do we have to flee into space?\\\", only an inconvenience—even if half the planet\\\'s land surface floods, well, we only live on about .5% of it anyway (we use another 9% for agriculture, admittedly, but presumably we\\\'d lose a lot of population in that flooding, so the remaining agricultural land could probably still provide for the survivors).
As for EarthThatWas, it is ridiculously unlikely that it can be more efficient to terraform new planets than to fix the old one—never mind that it\\\'s also impossible Earth could be \\\"used up\\\" within a mere couple of centuries. Green alarmism notwithstanding, the realistic \\\'\\\'worst\\\'\\\' case scenario has us set for every resource except a few petrochemicals for the next several millennia. Even the most apocalyptic global warming scenarios are, at least relative to the question \\\"Do we have to flee into space?\\\", only an inconvenience—even if half the planet\\\'s land surface floods, well, we only live on about .5% of it anyway (we use another 9% for agriculture, admittedly, but presumably we\\\'d lose a lot of population in that flooding, so the remaining agricultural land could probably still provide for the survivors).
