7. What do you mean by a light year?
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Light-year is the distance light travels in one year. Light zips through interstellar space at 186,000 miles (300,000 kilometers) per second and 5.88 trillion miles (9.46 trillion kilometers) per year
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A light-year is a measurement of distance and not time . A light-year is the distance a beam of light travels in a single Earth year, or 6 trillion miles . On the scale of the universe, measuring distances in miles or kilometers doesn't cut it.
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