If interested, apparently you can find floating around on the internet Cameron's original treatment which contained a lot more explanatory information (such as the conditions on earth, some differences in the planetary mythology -- if CP didn't like the planet's role in this version she'd have liked the original version less). Apparently if it had all made it on screen the movie would have been about 5 hours long.
If the sequels happen I suspect a lot of it will end up in those.
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