Whats A Light Year ?
Posted By Zoe Delphy On May 17, 2008
A light year is the total distance travelled by a beam of light in one year. A beam of light can travel at up to 300,000 km/sec and the approximate distance covered in a year works out to be 9,470,000,000,000 km (1 light year = 9.47 x1012 km). So why did scientists create this new unit of measure ?
Well as you can imagine the universe is so vast that talking about the distances between stars and planets was just unmanagable with miles and kilometres. For this reason a standardised unit of measure which we call the light year was created.
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