length expansion

  We looked at the Ehrenfest paradox last time. There are two issues in the Ehrenfest paradox. The first assumes a disc made up of an ideal rigid body, but when rotated at relativistic speed, it ruptures. The second is that the perimeter of a rotating body is different from its length when it is stationary. In the last post I looked at the first issue, and this time I want to look at the second issue. For those who have not read the first part, I will briefly introduce this paradox. It is best to read the previous post. Below is a link to the first part. The Ehrenfest paradox part I Rotating disc and length contraction   In relativity, objects that run very fast are said to shrink in length. So the official name of this is Lorentz - Fitzgerald Length contraction. It is not 'Einstein's length contraction'. This was born regardless of the theory of relativity. Before the theory of relativity was published, several people experimented to detect ether, but the...

In scientific thinking, there are times when you have to ignore enormous variables, even if it is a minor problem, sometimes you have to trace it to the end. Today I will trace to the end the logic of these modern sciences. Some of the following are officially recognized in modern astronomy and relativity. 1. The length of a very fast moving object shrinks.      - Lorentz-Fitzgerald length contraction hypothesis - 2. The universe is expanding.  - Hubble's Law, Big Bang Theory - 3. In the distant universe, there is a celestial body moving at the speed of light.       - Big Bang theory, event horizon - 4. The universe, just below the event horizon,       moves away from the Earth at a relatively relativistic pace.       - Big bang theory - 5. Looking at the earth from the event horizon,      rather the earth is near the horizon of the event.      - Big bang ...