No one knows for sure what a long-range space journey will be like for the people on board. Nobody in the history of our species has ever had to deal with the "Earth-out-of-view" phenomenon, for instance.
No one knows for sure what a long-range space journey will be like for the people on board. Nobody in the history of our species has ever had to deal with the "Earth-out-of-view" phenomenon, for instance.
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