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Night is the period of time between the sunset and the sunrise when the Sun is below the horizon. This occurs after dusk. The start and end times of a night vary based on factors such as season, latitude, longitude and timezone. Night is also the period when astrophotography can take place, recording images of astronomical objects and large areas of the night sky.
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What is this effect, with millions of coloured light dots surrounding people in the dark?
I found this picture:
.
What kind of technique is necessary to create such pictures?