Humanities
One year traveling in space at constant light speed would be how many on earth?

Final Answer

Time dilation does not kick in at a particular speed. It increases gradually as speed increases. The time dilation factor is: Sqrt(1/(1-(v/c)2)).

When v/c = 0.9 it is a factor of 2.29.

If clock at rest measures 1 hour in reference frame at rest then clock moving at 0.9c will observe 1/2.29 hours = 26 minutes

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