S46 E12: The Planets: Inner Worlds

Aired: 7/24/2019 | 0:53:54 | Expires: 9/12/2019 | Episode
The rocky planets—Mercury, Venus, Earth and Mars—were born of similar material around the same time. Yet only one of them supports life. Were Earth's neighbors always so extreme? And is there somewhere else in the solar system life might flourish?

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