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If you include car lights and similar in what is turned off, then in a big city such as London, which has a radius of about 10 miles, there would be very little light pollution, instantaneously. However, there would still be a lot of atmospheric pollution, and so it wouldn't be possible to see stars as faint as can be seen from, say, the top of a mountain. ...


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No, your eyes would need to adjust to the decrease in light before you would see really well. Also, it is now very difficult to have zero light pollution. Mt Palomar experiences light pollution and it is at least 2 miles from light sources.



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