PHYSICS PROBLEM HELP?

Suppose NASA discovers a planet just like Earth and it is 35 light-years away from our Solar System. NASA quickly plans to send astronauts to this planet, but with the condition that the astronauts would not age more than 25 years during this journey. a) At what speed must the spaceship travel, in Earth's... show more Suppose NASA discovers a planet just like Earth and it is 35 light-years away from our Solar System. NASA quickly plans to send astronauts to this planet, but with the condition that the astronauts would not age more than 25 years during this journey.

a) At what speed must the spaceship travel, in Earth's reference frame, so that the astronauts age 25 years during this journey? b.) According to the astronauts, what will be the distance of their trip?
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