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23 Nov 2019
In an Earth reference frame, a star is 85 light-years away. How fast would you have to travel so that to you the distance would be only 31 light-years?
In an Earth reference frame, a star is 85 light-years away. How fast would you have to travel so that to you the distance would be only 31 light-years?
Casey DurganLv2
3 May 2019
