How old is the universe ?

The universe is a mystery to humanity, and its age is one of the greatest. Since, it is very difficult to estimate a time of life to that vast outer space where everything is millions of light years. Current theories indicate that the universe is expanding after its birth in the Big Bang. Therefore, it is also in cooling after said event. Now, the calculated age comes from the speed with which the universe expands. It can be something complex to understand, but then we will explain a little more.

Expansions:

One of the theories used to calculate the life of the universe is based on the events of the Big Bang. Where it is stated that after that great explosion the universe is in motion and in constant expansion. Therefore, all celestial bodies have a speed and relative movement with respect to other bodies. This being the main data that allows you to calculate or estimate an age to the universe.It has also raised the possibility that the universe has experienced not only a great expansion. But it has lived through continuous expansions that have kept the universe in constant movement. Obviously, the relative movements between galaxies are also used to define the age of the universe. However, it is a theory that maintains a lesser role and acceptance by modern science. Some astrophysicists say that the cosmos was born at least 15,000 million years ago, and others believe that its age does not exceed 8,000 million. The reason for this dance of figures lies mainly in the value, still to be determined with exactitude, of a cosmological constant known as the Hubble constant (Ho), formulated by Edwin Hubble in 1929. According to this, galaxies move away from the our - the Milky Way - at a speed directly proportional to the distance of the observer. For Allan Sandage, of the Carnegie Observatories in the United States, the value of the constant is 57 kilometers per second and megaparsec (one megaparsec equals 3,260,000 light years), then the age of the universe would be 15,000 million years. This data contrasts with that presented recently by the American researcher Wendy Freedman, which grants a value for Ho of 80 kilometers per second and megaparsec, which shows an age of 8,000 million years. The debate is served.There are other studies that indicate that the universe could be 15,000 million years old because the CNO cycle is twice as slow as previously thought.However, for Wendy Freedman the constant has a value of 80 kilometers per second and megapersec. Defining the age of the universe in about 8,000 million years. According to the authors of the study, the fact that this single event of gravitational waves allows to determine an age for the Universe is remarkable, and it is not possible with each detection of gravitational waves. In this case, there was an optical identification of the source (so that a speed could be measured), which was also not too distant or too weak. With a large statistical sample of gravitational wave events of all types, the current range of values ??for the antiquity of the Cosmos will be reduced. The new result is intriguing for another reason. Although both CMBR and galaxy measurements are fairly accurate, they appear to be at odds with each other at approximately the ten percent level. This disagreement could be just an observation error, but some astronomers suspect that it could be a real difference that reflects something that is currently missing in our image of the process of cosmic expansion, perhaps related to the fact that the CMBR arises from a time of the Cosmic time very different from that of the galaxy's data. This third method, that of gravitational waves, can help solve the puzzle.

Stationary Universe:

Another theory put forward for age the universe says that the universe is not in motion, but is stationary. Therefore, they establish that the life of the universe determined as "infinite." However, this theory is not well regarded by the current scientific community but by more orthodox scientists. For now, the age of the universe is still under study and will continue for a few years. However, every day technological advances are advancing rapidly and in a few decades they will be able to define this value. Therefore, it is only a matter of time to solve this important cosmic mystery.