If all humans died, when would the last light go out?

If all humans died, when would the last light go out?If all humans died, when would the last light go out? External link

Get a copy of What If? 2 and Randall’s other books at: https://xkcd.com/books More serious answers to absurd questions at: https://what-if.xkcd.com/ If every human somehow simply disappeared from the face of the earth, how long would it be before the last artificial light source would go out? Ra

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