Science fiction is not concerned with dealing with the question of why and how something can exist. That is, in fact, why it's called 'science fiction' and not just 'science,' for the essence of science is determining why and how something can exist, whether that be mankind, a basic chemical reaction, or a supernova.
And please don't insist that the science fiction you happen to like is what constitutes 'quality' science fiction. It's just the science fiction you happen to like.
--matt
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