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

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.

Secure Information

Content will be erased after question is completed.

Enter the email address associated with your account, and we will email you a link to reset your password.

Forgot your password?

Sign Up