A spaceship, 250 m long as seen on board, moves by the earth at 0.900c. What is its length (in m) as measured by an earth-bound observer?

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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.