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Astronaut, which is derived from words meaning "star sailor," can be used to describe anyone who travels beyond the atmosphere of a planet, but it is usually attached to individuals (or those in small groups) who travel into a local orbit around their homeworld or beyond.
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Book about reaching a nearby star and returning millennia later
Distinct lack of interest in the astronauts, but polite in dealing with them. … When the astronauts returned to Earth (another long trip), many millennia have passed (the number 50,000 years comes to mind but could be VERY wrong) the astronauts land and Earth has changed (obviously …