what does light year.
ear mean?
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A light-year is the distance a beam of light travels in a single Earth year, or 6 trillion miles (9.7 trillion kilometers). On the scale of the universe, measuring distances in miles or kilometers doesn't cut it. ... For example, the nearest star to our sun, Proxima Centauri, is 4.2 light-years away.
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unit to measure time in space
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