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Reionization
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== Stages == Theoretical models give a timeline of the reionization process. In the first stage of reionization, each new star is surrounded by neutral hydrogen. Light emitted by the star ionizes gas immediately around the star. Then light can reach further out to ionize gas. The ions can recombine, competing with the ionization process. The ionized gas will be hot and it will expand, clearing out the region around the star. The sphere of ionized gas expands until the amount of light from the star that can cause ionizations balances the recombination, a process that takes hundreds of millions of years. (The time is so long that stars die before the full extent of the reionization completes for that star.) At some point the shell of ionization from each star in a galaxy begin to overlap and the ionization frontier pushes out into the intergalatic medium.<ref name=Wise-2019/>
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