(Answered) An astronaut who is 30 years old gets into a spaceship and

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An astronaut who is 30 years old gets into a spaceship and travels to the star 51 Pegasi, which is 50 light years away (this is the closest star to earth that has a planet orbiting it). The spaceship quickly reaches its cruising speed of 0.9c. Ignoring the acceleration and deceleration at the beginning and end of the trip, how old does the astronaut appear to be when he reaches the new planet at 51 Pegasi? 1 light year is 9.46 x 1015m.

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