camiyadelk
camiyadelk camiyadelk
  • 13-09-2017
  • Geography
contestada

Define light- year and explain how and why light- years are used to measure distances in the universe

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Issho
Issho Issho
  • 13-09-2017
A unit of astronomical distance equivalent to the distance that light travels in one year .....and because it is the fastest way to measure in a very long distances for example earth to other far away planets
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