An Unidentified flying object (UFO) is travelling across our atmosphere with a speed of 0.75c. The citizens on Earth estimated the length of the UFO roughly around 500m. Applying the concept of special relativity, what is the length of the UFO if the inertial frame of reference is the UFO itself

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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.