From slashfilm [excerpt],“It’s set in 2085, about 30 years before Sigourney [Weaver's character Ellen Ripley]. It’s fundamentally about going out to find out ‘Who the hell was that Space Jockey?’ The guy who was sitting in the chair in the alien vehicle — there was a giant fellow sitting in a seat on what looked to be either a piece of technology or an astronomer’s chair. … [The film] is about the discussion of terraforming — taking planets and planetoids and balls of earth and trying to terraform, seed them with the possibilities of future life.
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