Nova - The Planets: Inner Worlds

The rocky planets - Mercury, Venus, Earth and Mars - were born of similar material around the same time, yet only one supports life. Were Earth's neighbors always so extreme? Is there somewhere else in the solar system where life might flourish?

Series Website: http://www.pbs.org/wgbh/nova/

Episode Website: https://www.pbs.org/wgbh/nova/video/the-planets-inner-worlds/

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