As a high-speed spaceship flies past you at half the speed of light, a light bulb in the center of a room inside the rocket suddenly turns on. Call the light hitting the front end of the room event A and and the light hitting the back of the room event B. As measured by you, which event occurs first, A or B, or are they simultaneous. Please explain your answer.

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.