Answer:
One light year \[=\text{ 9}.\text{46 }\times \text{ 1}{{0}^{\text{15}}}\text{m }=\text{ 9}.\text{46 }\times \text{ 1}{{0}^{\text{12}}}\text{km}.\] As the distances of stars are extra-ordinarily large, so it is convenient to express them in light year rather than in metre or kilometre.
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