define light year???????
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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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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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