8. A star is measured to be 40.0 ly from Earth, in the inertial frame in which both star and Earth are at rest. (a) What would you determine this distance to be if you travelled to the star in a spaceship moving at 1.00 X 10 m/s relative to Earth? (b) How long would you determine the journey to take? 9. The proper length of one spaceship is twice the proper length of another. You, an observer in an inertial frame on Earth, find the two spaceships, travelling at constant speed in the same direction, to have the same length. The slower spaceship is moving with a speed of 0.40c relative to Earth. Determine the speed of the faster spaceship relative to Earth