由于自然科学,特别是物理学的迅速发展,在十九世纪末,出现了许多矛盾.例如,在高速运动着的物体(例如火箭)上,一把尺子要比地球上的短,一个时钟的一小时要比地球上的长.1881年美国物理学家迈克尔逊(A.A.Michelson)用他自己设计的干涉仪作过一次有较大影响的实验.在实验中他测量了光在地球绕太阳运动的方向上的速度和光在其垂直的方向上的速度.实验表明了:自然界中运动着的一切物体,(即使在真空中也一样)将沿着运动的方向缩短.当时,这个问题一提出来,遭到不少科学家的反对.有的认为这个实验 Due to the rapid development of the natural sciences, especially physics, many contradictions arose at the end of the nineteenth century, for example, on a body moving at high speed (such as a rocket), a ruler is shorter than one on Earth, Hour longer than on Earth.The American physicist AAMichelson made an influential experiment with his own interferometer in 1881. In the experiment he measured the light moving around the sun on Earth The speed of the direction and the speed of the light in its vertical direction.Experiments have shown that everything moving in nature, even in a vacuum, will be shortened in the direction of the motion.When the question was raised, Many scientists have been opposed. Some think this experiment