The Big Bang did not happen at a place, it happened everywhere in a - as far as we know - infinite universe. This process of particles pairing up is called "Recombination" and it occurred approximately 240,000 to 300,000 years after the Big Bang. [] ~ rate coefficients of Be-like neon p. 829 I. Orban, S. Böhm, S. D. Loch and R. Schuch It is the inverse process to ionization. Recombination was the stage during which simple atoms, e.g.


(b) At about 300,000 years after the Big Bang, the plasma of free electrons and nuclei condensed to form a neutral gas, in a process called recombination. Light had formerly been stopped from traveling freely because it would frequently scatter off the free electrons. Decoupling means that the photons stopped scattering off electrons, which become bound to neutral atoms during this epoch. Before decoupling electrons, protons are not presented in the atom and after decoupling the electrons, and protons are presented in the atom. This is equivalent to a redshift of around z = 1090.
Different distortion signals. [citation needed] At that time, however, matter had been diffused by the expansion of the universe, and the scattering interactions of photons and electrons were much less frequent than before electron-proton recombination.

Recombination (a) The capture of an electron by a positive ion. The “fingerprint” from the recombination era is produced some 260,000 years (hydrogen), 130,000 years (neutral helium), and 18,000 years (ionized helium) after the Big Bang ().Today these lines are redshifted by more than a factor of 1000 and are visible in the CMB. As did recombination, a (nearly) uniformly dense plasma stretching in all directions for infinity and then it started - everywhere in the infinity - to undergo a phase transition to hydrogen atoms and light was set free from all places of the infinite space. The cosmic microwave background radiation is an emission of uniform, black body thermal energy coming from all parts of the sky. This occurred between 150 million and one billion years after the Big Bang (at a redshift 6 < z < 20). Diffusion damping took place about 13.8 billion years ago, during the stage of the early universe called recombination or matter-radiation decoupling.This period occurred about 320,000 years after the Big Bang. The radiation is isotropic to roughly one part in 100,000: the root mean square variations are only 18 µK, after subtracting out a dipole anisotropy from the Doppler shift of the background radiation. At recombination, Universe became transparent to electromagnetic radiation after universe expanded enough to cool down to form neutral atoms. If we declare that light is constituted of photons , also photons are emitted from radiative recombination , impossible that photons from the sun (continuous …

The Universe went from being opaque to transparent at this point.

Before that, the matter plasma was effectively opaque to electromagnetic radiation due to Thomson scattering by free electrons, as the mean free path each photon could travel before encountering an electron was very short.

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