If one generation corresponds to roughly twenty years, this means that ten generations of humans will be born on the starship, which will be the only home they know. Although this may seem daunting, realize that during the Middle Ages, master architects would design grand cathedrals knowing that they would not live long enough to see the completion of their masterpieces. They knew that perhaps their grandchildren would be the ones to celebrate the opening of the cathedral. Also, realize that during the Great Diaspora, when humans began to leave Africa roughly seventy-five thousand years ago in
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