length expansion

   There was a time when we believed that ether existed in the whole universe space. So people made a hypothesis. The so called 'ether hypothesis'. People were not sure whether they existed or not, but people wanted to believe that ether existed. So, people started from the hypothesis and worked hard to find this ether. However, even though the experiment was repeated and the device was experimented with various changes, no evidence of ether was found. People thought the ether was inevitable, and the experimental results could not be denied. Therefore, although not experimentally confirmed, people have made additional hypotheses to protect the ether hypothesis and to satisfy the experimental results. That is the 'length contraction hypothesis'. The effect is exactly the same when applying these two hypotheses and when none is applied. In this case, we call it 'Carry fire in one hand and water in the other'. The fire corresponds to ether hypothesis,...