This is a photo that many people have likely seen which I think originally comes from NASA. Since the photo is so large, I just provided the link from wikipedia.com: (it might take a few seconds to load depending on your internet speed)
http://upload.wikimedia.org/wikipedia/commons/2/21/Earthlights_dmsp.jpg
If you zoom in you can clearly see the lit up outline of Nova Scotia and Halifax area along with all the other major North American centers.
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