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A spaceship is moving toward Alpha Centauri, the closest star system located 4.2 light-years away, at...

A spaceship is moving toward Alpha Centauri, the closest star
system located 4.2 light-years away, at a speed of 0.98c.
a) How much time does the trip last as measured from an astronaut onboard?

b) How much time does the trip last as measured from an observer on earth. Assume
the distance between the earth and Alpha Centauri remain the same.
c) What is the distance between the earth and Alpha Centauri as seen from an
astronaut onboard the spaceship?

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