Why does light always have a constant velocity in any frame of reference?

Albert Einstein proposed that the speed of light is always constant, and that the speed of light you measure will always be c., no matter what your state of motion or position isAnd then from this comes the faster the speed, the slower the time passes, and so on.

Actually, this is the premise of some of his assumptions. Based on the constant speed of light, many more inferences are given.

The basic assumption of Einrestein's special theory of relativity is that the laws of science are the same for any observer, regardless of their state of motion. From this it is concluded that the relativity of space-time, i.e., neither time nor space is absolute, they are both relative.

If the jury is faster than the speed of light, then time will be turned back. But the theory of relativity does not allow time to go backwards because according to E mc 2, when the velocity increases, the energy possessed by the object increases, then the mass of the object increases accordingly. And to increase the velocity of the object after the mass increases, more energy is required.

If an object needs to reach the speed of light, it needs an infinite amount of energy. Therefore, only some substances without intrinsic mass can reach the speed of light.

In addition, a gamma parameter ( ) also shows that the speed of motion of an object cannot reach the speed of light.

According to McCoswell, the basis of electromagnetic theory, the speed of electromagnetic wave propagation (i.e., the speed of light) is only related to some fundamental physical constants, not to the frame of reference.

In order to solve the contradiction between this conclusion and classical mechanics, the Lorentz transform was introduced. It combines three-dimensional space and time into a four-dimensional vector, and different frames of reference are equivalent to translational and rotational transformations. Under this transformation, if an object moves at the speed of light in one frame of reference, then it will still move at the speed of light when transformed into another frame of reference.

Under such transformations, Maxwell's equations can be held simultaneously in different frames of reference.

Einstein's special theory of relativity provides a physical meaning to the Lorentz transform. He believed that at high speeds, the spatial scale would change, so that the velocities could not be added directly, but a factor should be introduced, which was the result of the Lorentz transformation.

At the same time, he also proposed the kinetic theory, which states that the mass of matter increases with velocity. So for an object with a non-zero mass at rest, the energy required to accelerate it to the speed of light is infinite. Whereas, a substance with zero mass at rest will have a non-zero mass when moving at the speed of light.

Summary. The special theory of relativity is a theory that is only applicable in the inertial frame, where the spacecraft and the earth are not actually inertial frames, but the earth is approximate to the inertial frame, and the people on the earth can push out the people on the spaceship and the time slows down, and the spacecraft is not an inertial frame, because the people on the spaceship have to compare time with the people on the earth and experience turns and speeds, otherwise it is impossible to fly out and return to the earth, so the spacecraft is not an inertial frame, so the people on the spacecraft cannot push out the people on the earth and the time slows down. It is important to remember that special relativity only works in inertial frames.

The answer to why the two frames of reference are not the same is that the faster an object moves, the slower its time passes relative to a stationary object. This is what the theory of relativity is about.

Because the speed of light cannot escape the gravitational pull of a black hole, there is no velocity in a black hole, so it may be because of this that "a black hole can even suck time in".

The special theory of relativity is a theory that is only applicable in the inertial frame, where the spacecraft and the earth are not actually inertial frames, but the earth is approximate to the inertial frame, and the people on the earth can push out the people on the spaceship and the time slows down, and the spacecraft is not an inertial frame, because the people on the spaceship have to compare time with the people on the earth and experience turns and speeds, otherwise it is impossible to fly out and return to the earth, so the spacecraft is not an inertial frame, so the people on the spacecraft cannot push out the people on the earth and the time slows down. It is important to remember that special relativity only works in inertial frames.