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In the event of a mass power cut, how long would it take for the stars to become visible?
Would it be instantaneous? Would all the lights go out and you look up and there's the milky way? Or would it be slow? Would the sky stay dark as the light pollution caught in the clouds slowly bleeds away to reveal the stars?
(how fast would they disappear? To look up at the vastness of the heavens and the fullness of the universe and with final flick of a switch they disappear and you're surrounded by the artificial glow of streetlights.)