The star Sirius A is 8.66 light-years from Earth. Imagine a spaceship that travels from Earth to Sirius A at a constant speed of 0.951c. On Earth, we would measure the time it takes for the ship to reach the star to be (8.66 ly/0.951c)=9.11 years    (a) How much time (in years) would it take the ship to travel from the Earth to the star as measured by an astronaut aboard the ship?   (b) What is the distance to the star (in light years) as measured by an astronaut aboard the ship?

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