Why is there a gap between time in the universe and on Earth?

Twin Paradox Problem.

A specious problem in special relativity about time retardation. According to the special theory of relativity, it is the nature of time that the moving clock moves slowly, and all time-related processes are slowed down by motion, and the effect of slowing down is relative. So some people imagine a hypothetical space voyage, in which Twin A travels to a distant space in a high-speed spacecraft, and Twin B stays on Earth and returns to Earth after a few years.

According to B on the earth, A is in motion, and A's life process is slow, so A is younger than B; According to A on the spaceship, B is athletic, so B is younger. Returning to the comparison of encounters, the result should be unique, and it seems that special relativity has encountered insurmountable difficulties.

In fact, the twin paradox does not exist. Special relativity is a theory of space-time between inertial frames. The frame of reference in which A and B are located is not both inertial frames, B is an approximate inertial frame, and B is correct to infer that A is younger; A is a non-inertial frame, special relativity does not apply, and A cannot infer that B is relatively young.

In fact, according to the general theory of relativity, or even without the general theory of relativity, imagine a special process in which A moves relative to B at variable speed: very fast acceleration - uniform speed - rapid deceleration and then reverse rapid acceleration - uniform speed - very fast deceleration, according to the special theory of relativity, carefully considering the relativity of time delay and simultaneity, it can be concluded that no matter from the analysis of A or B, the conclusion is the same, that A on the spacecraft is younger than B. In 1966, a twin-like experiment was carried out with sons, in which they moved along a circle with a diameter of 14 meters and then returned to the starting point, and the results showed that moving sons did live longer than stationary sons.

Read the theory of relativity to understand.

The fact that A lives longer than B does not mean that A is younger at the same time.

The twin paradox problem is the result of the difference in the bells of the two inertial frames.

From the point of view of special relativity (actually, special relativity does not explain this problem, but general relativity is too complex for me to figure it out myself). A high-speed moving object, viewed from an inertial frame, slows down in time and shortens in length. But the problem is that two frames of reference at uniform or rest can observe each other, so when it comes to general relativity, only the brother who has undergone acceleration (i.e., the change in velocity) is younger.

Time and space are both forms of existence of moving matter, which are inseparable. There is no space without time, and there is no time without space. In terms of time alone, both time on earth and time in space are the same as a whole, and both have one-dimensionality, that is, irreversibility.

However, there is a difference between the way time on Earth is measured differently than in space. The time on Earth is measured in terms of one rotation of the Earth, one revolution of the Moon around the Earth, and one revolution of the Earth around the Sun, which are 12 months of a year, 365 days, 24 hours of a day, 1 hour and 60 minutes, and 1 minute and 60 seconds. However, this method of measurement is not suitable for space, where time is measured in terms of starting point and frame of reference.

The Milky Way has the measurement of the Milky Way, and the outer galaxy has the measurement of the Outer Galaxy. And the speed of its operation after entering space will also affect the calculation of time, the so-called one day in the sky, one year on the earth, or one day in the sky, and a thousand years on the earth are all correct, the key is to see what to use as a reference to measure time. Therefore, time on Earth and time in space are the same as the whole, but the concept of time is different due to the different units of measurement and measurement methods!

Time in space is the same as time on Earth. The traditional structure of time will not change after going into space. Because the traditional time structure is based on the rotation of the earth, the moon revolves around the earth, and the earth revolves around the sun as the unit of measurement, and secondly, the movement of celestial bodies in space is regular, and on the whole, time in space and time on the earth are the same.

The difference between time in space and time on Earth is that time correction in space is controlled by a timer on Earth. So there is a very small difference between time on Earth and time in space.

According to the theory of relativity, unless the speed of a spacecraft in space exceeds its speed, the time will be significantly different from that on Earth.

The time experienced by astronauts is not the same as the time we experience on Earth, but in general, the gap is not very large。We all know that the emergence of modern science has a significant impact on human civilization.

In terms of the development process, it has the same significance as a milestone. Can we say that it is not the politicians who have made great influence behind the scenes and behind the scenes to push the entire human race forward;

Rather, it is those scholars who have worked tirelessly and devoted their lives to scientific work, scientists. In particular, the rapid development of aerospace science and technology has made many people see that human beings finally have their own place in the vast universe.

Since there is no concept of time in the universe, astronauts want to see time, so they still use the Earth as a benchmark, and here are the specific reasons:

First of all, it takes eight minutes for the sun's rays to hit the earth back and forth, and in the universe, the astronaut can't feel it, the universe is dark and invisible, and the astronaut wants the light, so he has to go back to the cockpit, and when communicating with the earth at this time, he will ask the time of the earth in turn, because he can't judge himself;

Secondly, since the time of the earth is the standard, it is natural to time according to the time of the earth, so after entering the space of the scattered nuclear space, the astronauts involuntarily continue to carry out periodic activities according to the time prompted by the earth, so the time in space is still the same as the earth;

Finally, to sum up, when people in ancient times could not tell the time, they could also judge whether it had reached noon according to the height of the sun, but this operation could not be done in the universe;

Because the time correction in space is controlled by a timer on Earth. So there is a very small difference between time on Earth and time in space. According to the theory of relativity, unless the speed of a spacecraft in space exceeds its speed, the time will be significantly different from that on Earth, but this is impossible.

The theory of relativity is a basic theory about space-time and gravity, mainly founded by Albert Einstein, and is divided into special relativity and general relativity according to the different objects of study. The basic assumption of relativity is the principle of relativity, that is, the laws of physics have nothing to do with the choice of frame of reference. The difference between special relativity and general relativity is that the former deals with the laws of physics between frames of reference (inertial frame of reference) that move in a uniform linear manner, while the latter generalizes to frames of reference with acceleration (non-inertial frames) and is widely used in gravitational fields under the assumption of the principle of equivalence.

The theory of relativity has greatly changed mankind's "common-sense" concept of the universe and nature, and has put forward new concepts such as "simultaneous relativity", "four-dimensional space-time", and "curved space-time". It developed Newtonian mechanics and propelled physics to a new level.

The one upstairs was boring. First of all, tell the landlord that if the landlord is very slow in the universe, then you will live in space for 10 years, and the earth will also live for 10 years. If the landlord is flying in space, the speed is close to the speed of light, according to the theory of relativity, then time has slowed down for you (that is, the clock of the spaceship has gone around once, and the clock on Earth has already turned many times), that is, you seem to have only lived for 1 year, while for people on Earth it may be 100 years.

The second floor is very precise, but I have to add:

According to the general theory of relativity, the passage of time is also related to the distortion of space-time around the observer, which is distorted by gravity, and the greater the distortion, the faster the space-time passes. If the observer is not moving at high speeds, but is in a strong gravitational field (such as the edge of a black hole), he or she will also find that time passes faster than the Earth.

This question does not show that no one has lived in space for ten years, to say something with connotation.