9. A spaceship goes past a planet at a speed of 0.80c relative to the planet. An observer on the planet measures the length of the moving spaceship to be 40.0 m. The observer also finds that the planet has a diameter of 2.0 X 10 m. (a) The astronaut in the spaceship determines the length of the ship. What is this length? (b) The astronaut, while not in a position to actually measure the diameter of the planet, does succeed in computing a diameter indirectly. What is the resulting value