Canadian scientists explain rare 'nocturnal sun' phenomenon

Canadian scientists have unravelled the mystery behind what the Romans called the "nocturnal sun".

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    Canadian scientists have unravelled the mystery behind what the Romans called the "nocturnal sun".

    The event takes place when the sky is so bright during the night that books can be read.

    Scientists believe severe weather is behind the phenomenon, creating high energy waves in the upper atmosphere.

    Al Jazeera's Daniel Lak explains.


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