the Big Bang definition: 1. the large explosion that many scientists believe created the universe 2. the large explosion…. Cette théorie indique que l’univers est né il y a 13,8 milliards d’années, se développant grâce à l’explosion en question. L'idée remonte cependant aux années 1930 : on la doit au physicien belge Georges Lemaître (1894-1966), sous l'appellation originelle d'« atome primitif ».L'expansion de l Lemaître called this initial state the "The Big Bang theory, built upon the equations of classical general relativity, indicates a singularity at the origin of cosmic time, and such an infinite energy density may be a physical impossibility. Big Bang synonyms, Big Bang pronunciation, Big Bang translation, English dictionary definition of Big Bang. Nous vous proposons de découvrir la théorie du Big bang et les preuves qui appuient cette théorie. Selon la théorie, après l’expansion, l’univers a commencé à se refroidir et donc la formation des […] This universal expansion was predicted from general relativity by Friedmann in 1922That space is undergoing metric expansion is shown by direct observational evidence of the cosmological principle and the Copernican principle, which together with Hubble's law have no other explanation.

For example, the It is not yet understood why the universe has more matter than antimatter.Dark energy, though speculative, solves numerous problems. Extrapolation of the expansion of the universe backwards in time using general relativity yields an This primordial singularity is itself sometimes called "the Big Bang",Despite being extremely dense at this time—far denser than is usually required to form a The earliest phases of the Big Bang are subject to much speculation, since astronomical data about them are not available. Big Bang synonyms, Big Bang pronunciation, Big Bang translation, English dictionary definition of Big Bang. n. The beginning of space, time, matter, energy, and of the expansion of the universe according to the Big Bang theory. n. The beginning of space, time, matter, energy, and of the expansion of the universe according to the Big Bang theory. Ces mesures leur ont permis de déduire que le temps et l’espace avaient un commencement fini et résultent de l’origine de l’énergie et de la matière.

The Big Bang theory is a cosmological model of the observable universe from the earliest known periods through its subsequent large-scale evolution. "For an annotated list of textbooks and monographs, see Detailed information of and references for tests of general relativity are given in the article There is no consensus about how long the Big Bang phase lasted. Big Bang theory n. A scientific theory describing the origin of all space, time, matter, and energy approximately 13.7 billion years ago from the violent expansion of a singular point of extremely high density and temperature. Usually, at least the first few minutes (during which helium is synthesized) are said to occur "during the Big Bang".It is commonly reported that Hoyle intended this to be pejorative. Astronomical redshifts are extremely isotropic and Measurements of the effects of the cosmic microwave background radiation on the dynamics of distant astrophysical systems in 2000 proved the Copernican principle, that, on a cosmological scale, the Earth is not in a central position.During the following decade, CMB anisotropies were further investigated by a large number of ground-based and balloon experiments. The Big Bang is a scientific theory about how the universe started, and then made the stars and galaxies we see today. Cela pourrait être dû à ce qu’on appelle l’énergie noire. The flatness problem (also known as the oldness problem) is an observational problem associated with a FLRW.The problem is that any small departure from the critical density grows with time, and yet the universe today remains very close to flat.Before observations of dark energy, cosmologists considered two scenarios for the future of the universe. Measurements of the cosmic microwave background indicate that the universe is very nearly spatially flat, and therefore according to general relativity the universe must have almost exactly the The dark energy component of the universe has been explained by theorists using a variety of competing theories including Einstein's cosmological constant but also extending to more exotic forms of During the 1970s and the 1980s, various observations showed that there is not sufficient visible matter in the universe to account for the apparent strength of gravitational forces within and between galaxies. Hubble's law describes velocity that results from expansion Astronomers often refer to the cosmological redshift as a Doppler shift which can lead to a misconception.The Big Bang explains the evolution of the universe from a density and temperature that is well beyond humanity's capability to replicate, so extrapolations to most extreme conditions and earliest times are necessarily more speculative. Big bang et expansion de l'Univers Consulter aussi dans le dictionnaire : big bang. A few minutes into the expansion, when the temperature was about a billion Over a long period of time, the slightly denser regions of the uniformly distributed matter gravitationally attracted nearby matter and thus grew even denser, forming gas clouds, stars, galaxies, and the other astronomical structures observable today.Independent lines of evidence from Type Ia supernovae and the CMB imply that the universe today is dominated by a mysterious form of energy known as Dark energy in its simplest formulation takes the form of the It is popularly reported that Hoyle, who favored an alternative "The Big Bang theory developed from observations of the structure of the universe and from theoretical considerations. For some writers, this denotes only the initial singularity, for others the whole history of the universe. Before this discovery, all other astronomical objects have been observed to contain heavy elements that are formed in stars. While dark matter has always been controversial, it is inferred by various observations: the anisotropies in the CMB, galaxy cluster velocity dispersions, large-scale structure distributions, gravitational lensing studies, and Indirect evidence for dark matter comes from its gravitational influence on other matter, as no dark matter particles have been observed in laboratories.

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