The solar winds scatter electrically charged particles that would hit and ravage the Earth were it not for its magnetic field. This is what the Northern Lights reveal and one of the reasons why life is able to exist on our planet. Featuring, Brian Cox. Subscribe: http://bit.ly/BBCEarthSub

Watch more:
Planet Earth http://bit.ly/PlanetEarthPlaylist
Blue Planet http://bit.ly/BluePlanetPlaylist
Planet Earth II http://bit.ly/PlanetEarthIIPlaylist
Planet Dinosaur http://bit.ly/PlanetDinoPlaylist

The Planets transports you to the surface of the dynamic worlds of the Solar System to witness the moments of high drama that shaped each one. It reveals how the latest science allows us to unlock their past lives and pieces together clues of magnificent lost waterfalls on Mars, the mass planetary migrations as they jostled for position early in their history, and even the distant fate of Saturn as one of its moons awakens to form a beautiful water world.

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