How long does the journey take according to the astronaut?

An astronaut travels to a star system 4.5 ly away at a speed of 0.9c. Assume that the time needed to accelerate and decelerate is negligible. 1 lightyear (ly) is the distance light travels in 1 year moving at 3 x 108 m/s. How long does the journey take according to the astronaut?

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