NOVA

Earth's Magnetic Shield

Clip: Season 39 Episode 7 | 2m 5s

NOVA Labs will launch May, 2012.

Aired: 04/09/12

Rating: NR

The full episode is no longer available for online streaming. Why?

Please continue to enjoy extra(s) from this episode. The full episode is still available for purchase through the "Buy Now" links.

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