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    				| 1. | Define Light Year. Express one light-year in kilometres | 
| Answer» ANSWER:The light-year is a unit of length used to express astronomical DISTANCES and is EQUIVALENT to about 9.46 trillion kilometres (9.46×1012 km) or 5.88 trillion miles (5.88×1012 MI). ... Unit system: astronomy UNITS Unit of: length Astronomical units: 63241 au; 0.3066 pc Imperial & US units: 5.8786×1012 mi Explanation: | |