Quote:
Originally Posted by Sindri
The one change rule isn't adamant. There are examples with two necessary changes (especially if FTL is one of them.) for the desired setting that are still portrayed reasonably. The important thing is that unless the setting has wildly different physical laws adding changes at the drop of a hat is neither necessary nor desirable.
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An important note: I believe the "one impossibility" suggestion was developed in the context of classic science fiction, where the focus was frequently on the implications of said impossibility. At least as far back as ST:TOS, science fiction has been more about traditional stories told in a science fictional milieu than about the engineering.