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                                    A lightyear is a unit of distance. It is the distance travelled by light in one year. If the speed of light is equal to 3 x 108m/s, how many kilometres will make up 1 light year? | 
                            
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Answer»  A lightyear is a unit of distance. It is the distance travelled by light in one year. If the speed of light is equal to 3 x 108m/s, how many kilometres will make up 1 light year?  | 
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