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How long would it take to travel 1 light year from earth and 1 light year bac?

Answer:

1 light year is defined as the distance that light travels through vacuum in
one year. This tells us that in vacuum, such as interplanetary space, it takes
light one year to travel a distance of one light year.

First answer by Alcohen2006. Last edit by Alcohen2006. Contributor trust: 1141 [recommend contributor ]. Question popularity: 1 [recommend question].

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