Ezra Knight as
Episodes 9
Goldilocks
June 20, 2013
• 21m
1x4
Earth's distance from the sun is just right to sustain life, with neighbors Venus and Mars illustrating the impact of a slight difference in location.
Read MoreMagnetic Shield
June 27, 2013
• 21m
1x5
A metallic core at the center of the Earth turns the planet into a magnet, generating a field that protects life on the surface from cosmic radiation.
Read MoreStrangest Places
Season Finale
August 1, 2013
• 21m
1x9
The world's most astonishing sites include extreme underwater ecosystems, steamy subterranean worlds and stratling igneous formations of lava rock.
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