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A light year is the dis­tance in Earth years (365¼ days) that light trav­els in a vac­uum, mov­ing at about 300 mil­lion m/sec. In astron­omy the pre­ferred unit of dis­tance is the par­sec (3,26 light years). The as­tro­nom­i­cal unit (AU), which is equal to the dis­tance from the sun to Earth, is about 150 mil­lion km.

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