# Questions about Asimov's Nightfall - orbital mechanics

**URL:** <https://boards.straightdope.com/t/questions-about-asimovs-nightfall-orbital-mechanics/836923>\
**Category:** Factual Questions\
**Created:** [July 11, 2019, 7:48pm UTC](https://boards.straightdope.com/t/questions-about-asimovs-nightfall-orbital-mechanics/836923 "2019-07-11T19:48:06Z")\
**Posts on this page:** 1\
**Page:** 2

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**Author:** ![Chronos](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/chronos/32/134_2.png) [@Chronos](https://boards.straightdope.com/u/Chronos)\
**Post date:** [July 15, 2019, 1:03pm UTC](https://boards.straightdope.com/t/questions-about-asimovs-nightfall-orbital-mechanics/836923/21 "2019-07-15T13:03:58Z")

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I do wonder what that society would have used for indicators. The little green light that indicates that my computer is on, or the big green light that indicates that traffic can go in that direction, don’t provide any meaningful amount of illumination, but they’re still very useful.

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