Suppose a rocket ship leaves the Earth in the year 2020. One of a set of twins born in 2000 remains on the Earth while the other rides in the rocket. The rocket ship travels at 0.90c in a straight line path for 10 years as measured by its own clock, turns around, and travels straight back at 0.90c for another 10 years as measured by its own clock before landing back on the Earth. (a) What year is it on the Earth? (b) How old is each twin? (c) How far away from the Earth did the rocket ship travel as measured by each twin?
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