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Why the northern lights are heading south

Changes to Earth's magnetic field will likely see the Aurora Borealis creep closer to the equator. Dennis Kent from Columbia University's Lamont-Doherty Earth Observatory says the planet's magnetic field is returning to normal and that an inversion of the north and south poles is some way off.

(Photo: The northern lights as seen from Humbie in Scotland in 2014. Credit: Jim Hunter Images)

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3 minutes