A spaceship passes you at a speed of 0.90c. You find the length of the ship in your frame to be 50.0 m (The measurement is not easy: you have to arrange for a lamp to flash on the bow and the stern simultaneously in your frame and then determine the distance between the flashes). A few months later, the ship comes to the end of its mission and docks, allowing you to measure its length (Now the measurement is easy: You can walk along the ship with a tape measure). What length does your tape measure show?