According to the Michelson and Morley experiments, which of the following is NOT true? A beam of light that travels parallel to the aether would take longer than the beam that travels perpendicularly to the aether. The laws of physics are the same in all frames of reference that are moving uniformly. The speed of light is constant and is independent of the motion of the source or the observer. Waves had to have some medium to travel through.

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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.