How big was the beginning of the universe? How many years was the universe born?

Of all existences, the universe is the largest. Scientists believe it originated between 13.7 billion years ago and was incredibly large. It was an unimaginable energy event, and it would take 12 billion to 15 billion years for light from the edge of the universe to reach Earth.

The large ** emitted matter drifts through space, and the huge galaxies made up of many stars are made of these materials, and our sun is one of these countless stars. Originally, people imagined that the universe would not expand due to gravity, but scientists have discovered that there is a "dark energy" in the universe that produces a repulsive force that accelerates the expansion of the universe.

The expansion process after the big ** is a kind of gravitational force and repulsion force dispute, and the power generated by ** is a kind of repulsion force, which makes the celestial bodies in the universe constantly move away; There is a gravitational attraction between the celestial bodies, which prevents the celestial bodies from moving away and even tries to bring them closer to each other. The magnitude of gravity is related to the mass of the celestial body, so whether the universe will continue to expand or will eventually stop expanding and shrink and shrink in turn depends entirely on the density of matter in the universe.

Theoretically, there is some kind of critical density. If the average density of matter in the universe is less than the critical density, the universe will continue to expand, which is called the open universe; If the average density of matter is greater than the critical density, sooner or later the expansion process will stop and contract with it, which is called a closed universe.

The problem seems simple, but it's not. The theoretically calculated critical density is 5 10 30 g cm3. But it is not so easy to determine the average density of matter in the universe.

There is a vast intergalactic space between galaxies, and if the mass of all the luminescent matter observed so far is spread evenly over the entire universe, then the average density is only 2 10 31 grams cm3, which is far below the critical density mentioned above.

The big ** may be wrong, the universe may have been in a steady state, because the age of the universe produced by the big ** depends on the Hubble constant, and it is now generally believed that the age of the universe is about 15 billion years old, but if this is the case, the universe is younger than the Milky Way, and this contradiction is enough to impact the statement that the universe began with the big **. I suggest you check out Ken Crosswell's book "The Milky Way."

The current accepted date of the birth of the universe is about 13.7 billion years old.

The universe is a general term for the vast expanse of space and the various celestial bodies that exist in it, as well as the diffuse matter. The origin of the universe is an extremely complex issue. The universe is the material world, which is in constant motion and development.

For thousands of years, scientists have been searching for when and how the universe came to be.

Astronomy says

Soon after the Babylonian astronomers began their astronomical research, they proposed an astronomical model of the universe as a flat chassis floating in the ocean, which became the premise of early Greek maps, such as those made by Anaximander and Miliduhecataeus.

Later Greek philosophers observed the motion of celestial bodies, focusing on developing models of the universe more deeply based on empirical evidence. The first coherent model was proposed by Eudoxus of Niudos. According to Aristotle's physical interpretation of the model, celestial bodies orbit permanently in uniform motion around the stationary Earth.

Matter is completely contained in the Earth's sphere.

After abandoning the concentric sphere model, this geocentric model was also improved by Callippus, which was almost identical to Ptolemy's astronomical observations. The success of this model is largely based on the mathematical fact that any function, such as the position of a planet, can be decomposed into a set of circular functions (Fourier mode).

Other Greek scientists were the Pythagoras-school philosopher Philolaus. According to Stobaeus, a compiler of Greek writers' literature, Philolaus postulated that what was at the center of the universe was a lump"Center fire"(central fire), around which the earth, sun, moon, and planets revolve in a uniform circular motion.

The universe was originally a vacuum of nothing。In this case, the time is zero (the positive and negative imaginary times cancel each other out and appear as zero state time); The space is zero (the positive and negative virtual spaces cancel each other out and appear as a zero space); Matter is zero (neither positive nor negative particles are produced); There is zero energy (but there is infinite positive energy and infinite negative energy in it); The information is zero (contains all positive and negative information, but the external appearance is chaotic and informationless); Mental zero (in this case the unconscious state, "unintentionally true").

At this time, it is "Dao", "Wuji", "Zero", "Empty", and "Vacuum". Due to the breaking of positive and negative symmetry in the vacuum, that is, the "breaking of symmetry" in physics, the universe began to give birth to an imaginary point (also known as the "cosmic singularity" of the big ** cosmology). At this time, it is in the state of "Tao gives birth to one", "Wuji gives birth to Taiji", and "emptiness".

The cosmic singularity is large**, and at the same time, it releases positive and negative real-time space, positive and negative (or positive and negative) real particles, and positive and negative information waves, and the universe begins to expand greatly.