The universe is the sum of everything that exists with its corresponding physical laws; this includes time, space, matter, energy, etc. According to scientists, the universe is approximately thirteen billion years old and has a visible extent of ninety-three billion light years.
At the moment, the "Big Bang" theory, first postulated by Georges Lemaître, is the most widely accepted to account for the beginning of the universe. Explained in a vague and succinct way, according to this theory the objects of the universe are continually separating, so they must have been together once. In that beginning, the universe had a great temperature as well as a greater density. Then it began to drop in temperature as its expansion unfolded. The idea of the Big Bang assumes that, if the elements were all together at one point, a strong explosion separated them and they became separate elements that make up the universe: planets, stars, black holes, meteorites, satellites, etc.
Although there is consensus in science about the beginning of the universe, divergences appear when it comes to its end. The two possibilities that are usually considered are: a constant expansion or a contraction. In the first case, the speed with which the expansion of the universe takes place would be reduced, but it would remain constant; the density would become lower, stars would no longer be created and black holes would vanish; as for the temperature, it would decrease until approaching absolute zero. In the second case, which involves a contraction called "Big Crunch", the universe would expand to a maximum and then it would retract, becoming denser and hotter, returning to a state similar to the one it had in its beginning. However, both theories have not yet been able to show exactly what the processes would be to sustain this expansion or contraction, according to each of them.
Man has always been curious to explore the space around him, and the same thing that led Christopher Columbus to navigate the open sea to find possible routes to the Spanish Crown market, is what also led physical scientists to create instruments to observe the cosmos. More recently, that same curiosity led organizations like NASA to launch rockets into space, even with human beings on board, to explore the lands of the Moon, or other planets (only satellites have been sent to these at the moment) . There is no doubt that, if until now man has been able to determine and know with sufficient accuracy characteristics and formations of the galaxy itself, in a few more years it will be able to continue with the study of increasingly distant spaces.
Despite all the proposals that science makes us, the truth is that the Universe is full of enigmas. One of them is its size, since it far exceeds what is possible to be seen; another is related to its shape, being able to be flat or curved. These examples make it clear that the speculations of science will continue their course, and may lead us to analyzes that were unexpected at first.
The immensity of the universe, and all those enigmas and secrets that man cannot yet decipher, but makes an effort to do so, is the object of study not only by physicists, astronomers and mathematicians, but also by minor sciences such as astrology, which studies the stars in relation to people according to their birth, or disciplines such as ashtanga yoga or other forms of meditation, which pose bodily serenity but above all spiritual serenity to achieve harmony and balance with the space that surrounds us, since we are part of the universe.
