Why is the age of the universe 13 billion years old, and we lack to see anything 47 billion light ye

Observable Universe: See Wikipedia.

Let me briefly transcribe a few sentences: the diameter of the universe is generally thought to be 29 billion parsecs, or about 93 billion light-years;

The "observable universe" includes all galaxies and other matter that humans can observe on Earth today. The meaning of the term "observable" means that it does not rely on the detection capabilities of modern technology, but only represents the theoretical possibility of light or other signals from an object to the observer.

Because light and other signals have to go through a long time after the expansion of the universe has begun, in fact, we can only observe photon decoupling (photon escape) at the time of the recombination epoch, when the particle can emit photons that are not reabsorbed by other particles for the first time. Before that, the universe was a plasma opaque to photons. At this moment, the particles are just far enough apart that photons can be emitted from the "last scattering surface" and can be accepted by us today.

The age of the universe is calculated to be 100 million years, but due to the expansion of the universe, we now observe some objects that were very close at first but are now considered to be far farther than 100 million light-years away (according to the intrinsic distance of the universe, which is equivalent to the co-moving distance at the same time). The diameter of the observable universe is about 28 billion parsecs, about 93 billion light-years, and the radius of the observable universe is about 460 to 47 billion light-years.

Normally, people often think of 13.7 billion light-years as the size of the universe, and people take it for granted that since there is no matter in the universe that is faster than light, it makes sense to think that 13.7 billion light-years is the size of the universe. However, this fails to take into account that the universe is not smooth, static, and conforms to Minkowski's special theory of relativity of space-time. In fact, cosmic space-time becomes bent due to expansion, and as Hubble's law reveals, the speed of light multiplied by the cosmic time interval has no real physical meaning.

I guess it's a miscalculation.

The age of the universe is about 13 billion years, which is well known, but the farthest celestial object ever observed by mankind is 46 billion light-years away. Why in a space with an age of 13 billion yearsHowever, it can observe celestial objects 46 billion light-years away. Isn't the speed of light unsurpassable?

Why the hell is that!?

If you think so, then you have made a conceptual mistake, you have confused the time and space of the universe, and what we call a light year is a unit of distanceScientists say that they have observed 46.5 billion light-years away, not that they have really seen objects 46.5 billion light-years away, to be precise, 13.8 billion years ago have been expanded, and to 46.5 billion light-years away, this is the co-movement distance caused by the expansion of the entire universe.

Speaking of which, you should also understand, simply put, 13.8 billion years is a unit of time, and the farthest light that reaches the earth is 13.8 billion years ago, but the celestial bodies that emitted these lights did not moveIt's been expanding, it's always moving away from us, and 46.5 billion light-years is the distance after expansion.

The so-called speed of light barrier means that the speed of light moving in a vacuum is the highest speed in our world, the limit of the speed of light, and no matter can exceed the speed of lightOtherwise, the world would not be like this. The speed of light propagating in a straight line in a vacuum is 299792458 meters per second, and the value is generally 300,000 kilometers. Anything that our human eyes see is transmitted by light, so if there is a substance that is faster than the speed of light, it will appear that we have not yet seen, and this thing has passed through our body, and what the world will become, you can think about it for yourself.

But when Einstein said that the speed of light should not be exceeded, he meant that matter with static mass, and one electron and one proton have tiny static mass. Einstein's special theory of relativity states that the greater the speed of motion, the greater the energy required for an object to increase the speed of any objectWork must be done on it so that the energy of the object increases, and when the object approaches the speed of light, the energy tends to infinity.

Current theories suggest that the observable radius of the universe is about 46.5 billion light-years, and it is not yet known how large the unobservable extent of the universe is. In addition to the expansion of the universe itself, which is not limited by the speed of light, there are several things in this world that are not limited by the speed of light, including wormhole traversal, space-time folding, quantum entanglement, etc., which are not part of the transmission of material information with static mass.

Because we have very high-tech equipment, and there are a lot of human observation methods at present, and the observation angle is very good, we can only observe places for a long time.

A light-year is a unit of distance, and the celestial body that emits light is not moving, but is always expanding, always moving away from us, so 46.5 billion light-years is the distance after expansion.

Because the light-year is a unit of length and distance, and the age of the universe is 13 billion years, the universe is very large, and with our current science and technology, we can observe a planet 46.5 billion light-years away.

It's normal for people to have these questions. Because human vision is only light-second, the distance beyond light-second depends on technology and inference. It is impossible to actually observe reality in a three-dimensional fantasy world. Like the frog in the well guessing the earth and the sky, it is a doctrine of inference.

Science is the use of the scientific method to explore and understand things. We summarize the laws based on the existing known phenomena, deduce larger laws, and then use new observations to verify whether the deduced theories are correct. After repeated arguments, we will come to a conclusion that is getting closer and closer to the real objective law.

This conclusion does not need to be in line with our daily experience, as long as it is in line with every aspect of scientific reasoning, then this conclusion is correct.

<> based on our observations, we get the age of the universe at 13.8 billion years, and this number may be revised with the same precision, but not much of a change. And based on the age of the universe, we can calculate the observable extent of the universe. Yes, the range of 93 billion light-years is calculated, and with our current level of observation, we can't see that far, but it's the maximum range we can theoretically see, because beyond that, with the observational techniques we know, we can't see it.

At present, most of the measurement methods for the speed of light are defective, mainly by measuring the light that the moving object is not the light of the light source, but the static light source and the secondary light source relative to the measuring device (the mirror and lens in the measuring device are both secondary light sources, if the speed of light is the same relative to the measuring device, of course), the natural relative velocity measurement device is constant; I devised a method to directly measure the true velocity of the incident light produced by light sources in different states of motion. Measurements are made using the baseline method of two geostationary satellites communicating with each other in different states of motion relative to the light source (the sun and other celestial bodies).

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The age of the universe is 13.8 billion years, but the observable diameter of the universe is 92 billion light-years because the previous universe was infinitely dense.

1.In space exploration, our average car is too slow. If we launch an artificial satellite, we need to overcome the gravity of the Earth, and then we need to reach the first cosmic speed, that is, kilometers per second.

If we want to fly out of the Earth, completely free from the gravity of the Earth, we need to achieve a second cosmic velocity, that is, more than kilometers per second. If you want to get rid of the gravitational force of the solar system, you need to achieve the third cosmic velocity, that is, kilometers per second.

2.In the early days of the universe, there was no light, or no free photons to propagate, until 380,000 years later, when the first free photons were born with the advent of atoms (these photons formed what we now call microwave background radiation). However, we should not forget that the universe is always expanding, and the light source matter that emits these photons is always expanding with the expansion of cosmic space.

3.The theory about the origin of the universe is a big ** theory, and Hubble identified the expansion of the universe before it became the mainstream theory. In Einstein's theory of relativity, the speed of light in a vacuum is the limit of the speed of motion of an object in the universe.

Any static object does not exceed the speed of light, but there is no limit to space itself, so the rate of expansion of space does not violate the theory of relativity. Our universe has been expanding at the speed of light, and the observable diameter of the universe is related to the age of the universe and the expansion of space.

4.You know, the speed engine in science fiction is achieved by compressing and colliding time and space. Simply put, it is a cosmic scope that can be observed with the observer in mind.

Of course, by measuring the observable extent of the universe, this data is calculated. Scientists can calculate the observable radius of the universe by measuring the red movement of the microwave radiation particles in the universe. The above is the answer to the question of why the diameter of the observable universe is 92 billion light years when the age of the universe is 13.8 billion years.

This is because the universe is expanding, so the observable diameter of the universe is getting larger and larger over time, mainly because of the expansion of the universe, but in fact the age of the universe is indeed 13.8 billion years.

Because if the universe has been in a steady state since its birth, then the age of the universe is 13.8 billion years, and if the universe has been expanding, the space between light and the earth has been expanding, but the speed of light is constant, so the observable radius must be greater than this number.

Because the current technology is limited, and the expansion rate of the universe itself is relatively fast, greater than the propagation speed of light, there may be some deviations in the measurement.

There is a way to determine the age of the universe. It is based on the age of the player. The earliest globular nebulae are estimated to be about 11.5 billion years old.

The second is to use the Hubble constant for extrapolation. Current science believes that the universe, driven by the big **, continues to expand. According to the observations of American astronomer Edward Harb, galaxies are leaving us at a faster rate, proportional to the speed at which our galaxy is receding, and this proportion constant is called the Hubble constant.

With an understanding of the Hubble constant, we can deduce the time it took for the universe to develop to its current state, i.e., the age of the universe.

The age of the universe inferred from the Hubble constant measured by the Hubble constant is about 9 billion years, and the celestial bodies used to determine the Hubble constant are not only wealth-making centers, but also supernovae, planetary nebulae, quasars, and so on. In December 1998, a joint research team of the Japan Institute of Cosmology and Australia announced that their measurement of the age of the universe was based on the distance and receding velocity of the Earth from the Earth to the PKS1830-211 star. In September 1998, researchers at the National Astronomical Observatories of Japan announced that globular clusters were 15 billion years old, while another measured 24 billion years old using a measurement method that is independent of the Hubble constant.

Recently, German scientists have determined that the age of the universe is 34 billion years, and our current universe is still expanding due to the drive of big **, among which the observation team dominated by American scientists has been studying the expansion rate of the universe. The team compared the rate of regression of ancient supernovae with the rate of regression of recent new supernovae and found that the universe is expanding at an accelerating rate. If we go back in time and assume that the universe is slowly expanding, the universe would be as large as it is today, which would be a longer expansion time than the universe inferred from the Hubble constant, and the rate of expansion of the universe is closely related to the age of the universe.

Therefore, there will be more complex influencing factors for measuring the macroage of the universe.

All in all, the age of the universe measured by different measurement methods is not the same, and it varies greatly.

There is still no correct explanation for how the universe came into being and how it evolved. Whether it is 9 billion, 11.5 billion, 15 billion, or a different statement, the debate around the age of the universe is still inconclusive.

The universe is vast and infinite, and some of the observations of the universe have not yet reached a comprehensive level according to our current scientific and technological leakage techniques. So we should continue to understand and study in depth.

This is because of technology, our level of technology is not particularly high, and we can only observe so far away.