# Answer on Mechanics | Relativity Question for Derek

Question #3103

Planet A is 35 light years away from the Earth. An astronaut is traveling to the planet in a speed such that he would not age more than 25 years during the journey.

<br>At what speed must the spaceship travel, in the Earth's reference frame,

so that the astronauts age at most 25 years?

Answer is

v = 8.14c

<br>At what speed must the spaceship travel, in the Earth's reference frame,

so that the astronauts age at most 25 years?

Answer is

v = 8.14c

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