A light year is the total distance that a ray of light in a year. A beam of light can be raised to 300,000 km / sec and the approximate distance of one year from the projects to be 9,470,000,000,000 km (1 light year = 9.47 x1012 km). So why do scientists create new unit?
So as you can imagine the universe is so great to talk about the distances between stars and planets were just unmanagable with miles. For this reason, a standard unit of measurement known as light-years created
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