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The model is based on general relativity and on simplifying assumptions such as homogeneity and isotropy of space. A version of the model teen web cam chat a cosmological constant Lambda and cold dark matterknown as the Lambda-CDM modelis the simplest model that provides a reasonably good account of various observations about the universe. The Big Bang model accounts for observations such as the correlation of distance and redshift of galaxies, the ratio of the number of hydrogen to helium atoms, and the microwave radiation background.
During the Planck epoch, all types of matter and all types of energy were concentrated into a dense state, and gravity —currently the weakest by far of the four known forces —is believed to have been as strong as the other fundamental forces, and all the forces may have been unified. Objects in space did not physically move; instead the metric that defines space itself changed. Although objects in spacetime teen web cam chat move faster than the speed of lightthis limitation does not apply to the metric teen web cam chat spacetime itself. This initial period of inflation is believed to explain why space appears to be very flat, and much larger than light could travel since the start of the universe.
As the universe continued to teen web cam chat down from its inconceivably hot state, various types of subatomic particles were able to form in short periods of time known as the quark epochthe hadron epochand the lepton epoch. Together, these epochs encompassed less than 10 seconds of time following the Big Bang. These elementary particles associated stably into ever larger combinations, including stable protons and neutronswhich then formed more complex atomic nuclei through nuclear fusion.
This process, known as Big Bang nucleosynthesisonly lasted for about 17 minutes and ended about 20 minutes after the Big Bang, so only the fastest and simplest reactions occurred. Any other element was only formed in very tiny quantities.
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After nucleosynthesis ended, the universe entered a period known as the photon shaturbate. During this period, the universe was still far too hot for matter to form neutral atomsso it contained a hot, dense, foggy plasma of negatively charged electronsneutral neutrinos and positive nuclei. After aboutyears, the universe had cooled enough that electrons and nuclei could form the first stable atoms. This is known as recombination for historical reasons; in fact electrons and nuclei were combining for the first time.
Unlike plasma, neutral atoms are transparent to many wavelengths of light, so for the first time the universe also became transparent. The photons released " decoupled " when these atoms formed can still be teen web cam chat today; teen web cam chat form the cosmic microwave background CMB.
As the universe expands, the energy density of electromagnetic radiation decreases more quickly than does that of matter because the energy of a photon decreases with its wavelength. At around 47, years, the energy density of matter became larger than that of photons and neutrinosand began to dominate the large scale behavior of the universe. This marked the end of the radiation-dominated era and the start of the matter-dominated era. In the earliest stages of the universe, tiny fluctuations within the universe's density led to concentrations of dark matter gradually forming.
Ordinary matter, attracted to these by gravityformed large gas clouds and eventually, stars and galaxies, where the dark matter was most dense, and voids where it was least dense. After around - million years,[ citation needed ] the first stars formed, known as Population III stars.
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Teen web cam chat were probably very massive, luminous, non metallic and short-lived. They were responsible for the gradual reionization of the universe between about million years and 1 billion years, and also for seeding the universe with elements heavier than helium, through stellar nucleosynthesis. After about 9. Physical properties Main articles: Observable universeAge of the Universeand Metric expansion of space Of the four fundamental interactionsgravitation is the dominant at astronomical length scales.
Gravity's effects are cumulative; by contrast, the effects of positive and negative charges tend to cancel one another, making electromagnetism relatively insignificant on astronomical length scales.
The remaining two interactions, the weak and strong nuclear forcesdecline very rapidly with distance; their effects are confined mainly to sub-atomic length scales. The universe appears to have much more matter than antimatteran asymmetry possibly related to the CP violation. These laws are Gauss's law and the non-divergence teen web cam chat the stress-energy-momentum pseudotensor.
The images, labeled along their left edge, increase in size from left to right, then from top to bottom. Size and regions See brendiekira Observational cosmology Television signals broadcast from Earth will never reach the edges of this image.]
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