The new discovery of seven alien Earth-like planets in a faraway solar system is a major milestone in our hunt for extraterrestrial life, and experts investigate the secrets of TRAPPIST-1's mysterious worlds to reveal if we're truly alone in the universe.

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  • Episode Number 2
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  • Originally Aired Tuesday, March 26, 2019
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  • Last Updated By shriek
  • Last Updated 03/27/2019 1:39pm