The Earth was formed by a series of cosmic cataclysms, including the most powerful blast in the universe. Could the same chain of events have created other earths elsewhere, inhabited by creatures like us?
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Retitled, this episode re-aired on 10/1/2018 as "Earth: the Alien Mystery" with a summary of "New discoveries reveal the dark secrets of our planet's violent birth, and experts believe this could help find alien earths beyond our solar system."