Back Reïonisasie Afrikaans عودة التأين Arabic পুনরায়নীকরণ Bengali/Bangla Reionisierungsepoche German Επανιονισμός Greek Reionización Spanish بازیونیدهشدن Persian Réionisation French Reionisasi ID Reionizzazione Italian
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In the fields of Big Bang theory and cosmology, reionization is the process that caused electrically neutral atoms in the universe to reionize after the lapse of the "dark ages". Detecting and studying the reionization process is challenging but multiple avenues have been pursued. This reionization was driven by the formation of the first stars and galaxies.