Thefirstepisodetracesthedevelopmentofthefourrockyplanetsinoursolarsystem:Mercury,Venus,EarthandMars.Theywerebornatthesametimefromthesamematerial,yethavegoneentirelydifferentpaths.Whatforcesareatworkbehindit?WhyhasEarththrivedwhilsttheothershavefadedaway?Advancedspacemissionsrevealthemomentswhenthefateoftheseworldsturned.
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