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The vast distances that occur in the Universe are beyond being measured in miles or kilometres. To make it easier to calculate distance without having to work with millions of zeros we use the speed of light. For example, given that the speed of light is 186,000 MPS [miles per second] it would take you about 9 Mins. to reach the sun, or about 9 light mins. So when we are told it would take 2 light years to get to a point in space, they mean it will take you 2 years travelling at the speed of light- 186,000 MPS.

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15y ago

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