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Season 46 Episode 12 | 53m 49s Video has closed captioning.
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?
Aired: 07/24/19
Expires: 05/28/27
Sponsored By:
We are on the verge of answering one of the greatest questions in history: Are we alone?
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