Problem: An astronaut travels at 0.8 c from Earth to a star that is 20 light years away from Earth, as measured from the Earth's perspective. If the astronaut is 25 years old when leaving Earth, what is the age of the astronaut when arriving at the star?

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An astronaut travels at 0.8 c from Earth to a star that is 20 light years away from Earth, as measured from the Earth's perspective. If the astronaut is 25 years old when leaving Earth, what is the age of the astronaut when arriving at the star?