Earth's Invisible Shield - NOVA (2003)

The Earth’s molten core creates a magnetic field that surrounds the globe, guarding against a constant barrage of deadly radiation from space. Over the last few decades, this field has weakened dramatically, intriguing scientists across the globe.
Interesting documentary about the earth's magnetic field. Is it fading or will it reverse ? What do we know about the consequenses of the decrease or reversal of the magnetic field and what similarities are there with what happened on Mars...

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