Nobody knows how the universe was formed. Neither one knows that would it continue the same way nor when would it end. Astronomers construct hypotheses called cosmological models that try to find the answer. There are two types of models: Big Bang and steady State. However, through many observational evidences, the Big Bang theory can best explain the creation of the universe.
In 1948 the Russian-American physicist George Gamow modified Lemaitre’s theory of the primaeval atom. Gamow proposed that the universe was created in a gigantic explosion and that the various elements observed today were produced within the first few minutes after the Big Bang, when the extremely high temperature and density of the universe would fuse subatomic particles into the chemical elements. More recent calculations indicate that hydrogen and helium would have been the primary products of the Big Bang, with heavier elements being produced only later, within stars. Gamow’s theory, however, provided a basis for understanding the earliest stages of the universe and its subsequent evolution. Because of its extremely high density, the matter existing in the earliest moments of the universe would expend rapidly. As it expanded, the hydrogen and helium would cool and condense into stars and galaxies. This explains the expansion of the universe and the physical basis of Hubble’s law.
As the universe expanded, the residual radiation from the Big Bang would continue to cool, until now it should be at a temperature of about 3K. Today the universe is still expanding, as astronomers have observed. The Steady State model says that the universe does not evolve or change in time. There was no beginning in the past, nor there change in the future. This model assumes the perfect cosmological principle. This principle says that the universe is the same everywhere on the large scale, at all times. It maintains the same average density of matter forever.
There are observational evidences found that can prove the Big Bang model is more reasonable than the Steady State model. First, the red shifts of distant galaxies. Red shift is a Doppler effect which states that if a galaxy is moving away, the pectral line of that galaxy observed will have shifted to the red end. The faster the galaxy moves, the more shifts it has. If the galaxy is moving closer, the spectral line will show a blue shift. If the galaxy is not moving, there is no shift at all.
However, as astronomers observed, the more distance a galaxy is located from Earth, the more red shift it shows on the spectrum. This means the future a galaxy is, the faster it moves. Therefore, the universe is expanding, and the Big Bang model seems more reasonable than the Steady State model. The second observational evidence is the radiation produced by the Big Bang. The Big Bang model predicts that the universe should still be filled with a small remnant of radiation left over from the original violent explosion of the primeval fireball in the past. The primeval fireball would have sent strong shortwave radiation in all directions into space. In time, that radiation would spread out, cool, and fill the expanding universe uniformly. By now it would strike Earth as microwave radiation.
In 1965 physicists Arno Penzias and Robert Wilson detected microwave radiation coming equally from all directions in the sky, day and night, all the year round. And so it appears that astronomers have detected the fireball radiation that was produced by the Big Bang. This casts serious doubt on the Steady State model. The Steady State could not explain the existence of this radiation, so the model cannot best explain the beginning of the universe. Since the Big Bang model is the better model, the existence and the future of the universe can also be explained. Around 15 to 20 billion years ago, time began. The points that were to become the universe exploded in the primeval fireball called the Big Bang. The exact nature of this explosion may never be known. However, recent theoretical breakthroughs, based on the principles of quantum theory, have suggested that space, and the matter within it, masks an infinitesimal realm of utter chaos, where events happen randomly, in a state called quantum weirdness.
Before the universe began, this chaos was all there. At some time, a portion of this randomness happened to form a bubble, with a temperature in excess of 10 to the power of 34 degrees Kelvin. Being that hot, naturally it expanded. For an extremely brief and short period, billionths of billionths of a second, it inflated. At the end of the period of inflation, the universe may have a diameter of a few centimeters. The temperature had cooled enough for particles of matter and antimatter to form, and they instantly destroy each other, producing fire and a thin haze of matter – apparently because slightly more matter than anti-matter was formed. The fireball, and the smoke of its burning, was the universe at an age of trillionth of a second.
The temperature of the expanding fireball dropped rapidly, cooling to a few billion degrees in few minutes. Matter continued to condense out of energy, first protons and neutrons, then electrons, and finally neutrinos. After about an hour, the temperature had dropped below a billion degrees, and protons and neutrons combined and formed hydrogen, deuterium, and helium. In a billion years, this cloud of energy, atoms, and neutrinos had cooled enough for galaxies to form. The expanding cloud cooled still further until today, its temperature is a couple of degrees above absolute zero. In the future, the universe may end up in two possible situations. From the initial Big Bang, the universe attained a speed of expansion. If that speed is greater than the universe’s own escape velocity, then the universe will not stop its expansion.
Such a universe is said to be open. If the velocity of expansion is slower than the escape velocity, the universe will eventually reach the limit of its outward thrust, just like a ball thrown in the air comes to the top of its arc, slows, stops, and starts to fall. The crash of the long fall may be the Big Bang to the beginning of another universe, as the fireball formed at the end of the contraction leaps outward in another great expansion. 6 Such a universe is said to be closed, and pulsating. If the universe has achieved escape velocity, it will continue to expand forever. The stars will redden and die, the universe will be like a limitless empty haze, expanding infinitely into the darkness. This space will become even emptier, as the fundamental particles of matter age, and decay through time. As the years stretch on into infinity, nothing will remain. A few primitive atoms such as positrons and electrons will be orbiting each other at distances of hundreds of astronomical units.
These particles will spiral slowly toward each other until touching, and they will vanish in the last flash o light. After all, the Big Bang model is only an assumption. No one knows for sure that exactly how the universe began and how it will end. However, the Big bang model is the most logical and reasonable theory to explain the universe in modern science.