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Asimov did it with Nightfall as well as Standback's examples. As I've said elsewhere, it's only a "bad idea" if you're padding your story with effluvia. If you think you have more to say, more th...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/6096 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/6096 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Asimov did it with _Nightfall_ as well as Standback's examples. As I've said elsewhere, it's only a "bad idea" if you're padding your story with effluvia. If you think you have more to say, more things can happen to the characters, the characters can be more developed, the setting could be richer, then by all means go for it.