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S1, E10: After three missions and 665 weightless days in space, NASA’s most experienced astronaut, Peggy Whitson, smashes through the atmosphere on her final journey home — to planet Earth. With her first steps back on land, she encounters fresh air, blue skies, warm sun and, of course, gravity. There’s no place like home. Or is there? Just how strange is our rock and is it really unique in the universe?