Origine Of Universe

big bang happens

The Universe is commonly defined as the totality of everything that exists, including all physical matter and energy, the planets, stars, galaxies, and the contents of intergalactic space although this usage may differ with the context . The term Universe may be used in slightly different contextual senses, denoting such concepts as the cosmos the world or nature.Observations of older parts of the universe (which are far away) suggest that the Universe has been governed by the same physical laws and constants throughout most of its extent and history.

big bang theory

Throughout recorded history, several cosmogoni and cosmogonies have been proposed to account for observations of the Universe. The earliest quantitative Geocentric models were developed by the Ancient greek who proposed that the Universe possesses infinite space and has existed eternally, but contains a single set of concentric sphere of finite size – corresponding to the fixed stars, the Sun vations and improved theories of gravity led to copernicus, heliocentric model and the Newton model of the Solar System respectively. Further improvements in astronomy led to the realization that the Solar System is embedded in a glaxy composed of millions of stars, the Milky way, and that other galaxies exist outside it, as far as astronomical instruments can reach. Careful studies of the distribution of these galaxies and their spectral lines have led to much of modern cosmology Discovery of the red shift and cosmic microwave background radiation revealed that the Universe is expanding and apparently had a beginning this high-resolution image of the Hubble ultra  deef fieldshows a diverse range of galaxies, each consisting of billions of stars. The equivalent area of sky that the picture occupies is shown in the lower left corner. The smallest, reddest galaxies, about 100, are some of the most distant galaxies to have been imaged by an optical telescope, existing at the time shortly after the Big Bang.

 According to the prevailing scientific model of the Universe, known as the Big Bang, the Universe expanded from an extremely hot, dense phase called the Planck epoch, in which all the matter and energy of the observable universe was concentrated. Since the Planck epoch, the Universe has been expanding to its present form, possibly with a brief period (less than 10−32 seconds) of cosmic inflation. Several independent experimental measurements support this theoretical expansion and, more generally, the Big Bang theory. Recent observations indicate that this expansion is accelerating because of dark energy, and that most of the matter in the Universe may be in a form which cannot be detected by present instruments, and so is not accounted for in the present models of the universe; this has been named dark matter. The imprecision of current observations has hindered predictions of the ultimate fate of the Universe.

Current interpretations of astronomical observations indicate that the age of the Universe is 13.75 ±0.17 billion years, and that the diameter of the observable universe is at least 93 billion light years, or 8.80  × 1026 metres. According to general relativity, space can expand faster than the speed of light, although we can view only a small portion of the universe due to the limitation imposed by light speed. Since we cannot observe space beyond the limitations of light (or any electromagnetic radiation), it is uncertain whether the size of the Universe is finite or infinite.