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The shift in subject matter from westerns to science fiction was probably already underway when Burroughs began writing. The frontier, which had been such a key feature of American popular fiction, was rapidly disappearing, and writers had begun looking for new frontiers—hence, the increasing number of stories about…
In a dispassionate comparison of the relative values of human and robotic spaceflight, the only surviving motivation for continuing human spaceflight is the ideology of adventure. But only a tiny number of Earth's six billion inhabitants are direct participants. For the rest of us, the adventure is vicarious and akin…
The universe is probably littered with the one-planet graves of cultures which made the sensible economic decision that there's no good reason to go into space--each discovered, studied, and remembered by the ones who made the irrational decision.