What is the universe

The universe as a physical concept

Modern physicists, cosmologists and astronomy physicists call the universe's word on all the outer space of energy and matter, especially the energy that occupies space between different celestial bodies. After the stability of the concept of space-time developed by the German scientist Albert Einstein, modern physics has been able to determine the characteristics of the energy that occupy the space Using the astronomical concepts of the background radiation, the age of the universe was determined precisely from the time of the Great Bang to date, estimated at 13.7 billion years.

Definition of the universe

Astronomy indicates that the universe is the total space objects of stars and planets within the Milky Way galaxy and beyond the other galaxies and the radiation energy emitted on each other, and based on astronomical observations and the work of physicists and chemists of research scientists have developed a model of the emergence of the universe and the emergence of life In it, the model says that the universe began with the great explosion, and then the primary bodies formed of protons and neutrons and then the electrons, and then some protons merged with the neutrons and formed the nuclei of hydrogen atoms and helium, In addition to electrons, hydrogen gas is about 75%, helium is about 23% and very few heavier elements such as lithium are the beginning, and with the big bang time begins.

Theories about the existence of other universes

Scientists can not confirm the shape of space-time, but it is likely to be flat and spacetime extends to infinity. But if space-time continues indefinitely, it must start repeating itself at some point, because there are a certain number of ways in which particles can Time and place. Since the universe that can be seen extends only to the distance that light has been able to reach in 13.7 billion years since the Great Bang, space-time after that distance can be considered a separate universe in itself. In this way, there are many universes Which are next to each other to form a patch A giant of the universes, and according to this logical system, scientists proposed several theories about the existence of these universes, including:

Bubble universes: space pockets resulting from the expansion of time and space.

Parallel universes: by suggesting that there are many more dimensions than the four dimensions that science proves.

Mathematical universes: depending on the existence of other possibilities for each case or mathematical issue in mathematics, and therefore the possibility that there are alternatives to the current universe, which is based on these mathematical possibilities.

from
https://www.ararblog.com/2019/03/what-is-universe.html