northern lights
  • plural noun
    (written as Northern Lights)
    a spectacular illumination of the sky in the northern hemisphere caused by ionised particles striking the atmosphere.
  • An aurora occurring in the northern hemisphere. An aurora is a luminous phenomenon of the upper atmosphere occurring mostly in the high latitudes of both hemispheres. They are caused by the interaction of excited particles from space and particles of the upper atmosphere, and usually affect radio communications. Also called aurora borealis.

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