For centuries man has been questioning the origin of the universe, trying to find an answer, on both religious and scientific grounds. In the latter field, diverse theories compete with one another. Among them, the most famous is the Big Bang theory, which is officially accepted by the scientific community. Despite this, there are other schools of thought about the subject, whose theories have their supporters as well.
For instance, one of the most popular theories is that of Cosmic Inflation. According to this, many explosions followed the primordial one. Instead of rejecting the Big Bang theory, the Inflation theory confirms it and takes into consideration a second phase. This consists of a series of minor explosions, along with a sequence of expansions; thus, little pieces of the universe have been put together, resulting in what is seen today. Another theory is that of the Big Bounce. This one assumes the existence of a previous universe which, being subjected to contractions, would have become amazingly tiny. Nevertheless, gravity would have prevented it from collapsing, causing a kick-starting effect instead, making it bounce and expand. The Inflation theory is sometimes seen as more interconnected to this one than to the Big Bang theory, due to their similarities. A different school of thought suggests the occurrence of what is known as the Tunnel effect. This involves a phenomenon in which a particle can overcome a barrier whilst releasing energy. Applied to the origin of the universe, and according to the quantum mechanics, such a phenomenon occurred without further input of energy. The universe would thus have originated from nothing. To conclude, a rather interesting theory is that of the emerging universe. According to the Emerging universe theory, there was a time where a steady and fixed universe existed in a very small size. Such a situation would have always existed, until this tiny universe became unstable. This school of thought thus matches the Steady-state model and the Inflation theory. So, like the Big Bang theory, it accepts the idea of an expanding universe. Nevertheless, the big difference lies in that while this latter theory also takes into consideration the idea of a long-lasting stable universe, the Big Bang theory does not. In fact, its assumptions are based on the fact that everything originated from an explosion, after which the resulting universe would have been subjected to a continuous expansion. What’s more, the Big Bang theory, although universally accepted, does not provide any answers about ‘what’ would have exploded. This proves the weaknesses of this theory, in spite of the fact that almost all of its assumptions have been scientifically proven.
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