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How can the meaning of “year” retain relevance outside our solar system or galaxy?

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How can the meaning of “year” retain relevance outside our solar system or galaxy?

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1) Years are defined for planets, as the periodic time that they need to make a revolution around their stars. For this reason, a Mars year is different from an Earth year. Normally, years are not defined on satellites (natural or not), stars or other celestial bodies. Years are not defined in outer space either. However, an Earth bound astronaut would possibly use Earth time and dates. In fiction, Star Trek uses stardates. 2) “A year (from Old English ȝēr; symbol y or sometimes a) is the amount of time it takes the Earth to make one revolution around the Sun. By extension, this can be applied to any planet: for example, a “Martian year” is the time in which Mars completes its own orbit.” Source and further information: http://en.wikipedia.org/wiki/Year 3) “A planet (from Greek πλανήτης, from the verb πλανώμαι planōmai I wander), is a celestial body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear f

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