A spaceship is traveling toward earth from the space colony on Asteroid 1040A at a speed of 0.9c relative to earth. Assume that the asteroid and the earth are in the same frame of reference. When the ship is at the halfway point of the trip, as measured in the earth frame, two radio messages are sent simultaneously to the spaceship, one from earth and the other from 1040A. Does the ship receive these two messages at the same time? Explain your reasoning.
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