courses:ast100:2
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| courses:ast100:2 [2026/02/23 23:17] – [2. Description] asad | courses:ast100:2 [2026/02/24 06:34] (current) – asad | ||
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| ====== 2. Galactic age ====== | ====== 2. Galactic age ====== | ||
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| Following the epochs of recombination and decoupling at the end of the Particle Age, the universe became electrically neutral and transparent as electrons and protons combined to form hydrogen and helium atoms. However, this transition ushered in a prolonged **Dark Ages** spanning hundreds of millions of years. During this era, the primordial fireball had dimmed and the first luminous stars had yet to ignite, leaving the cosmos in absolute darkness even as it continued its rapid expansion. Simultaneously, | Following the epochs of recombination and decoupling at the end of the Particle Age, the universe became electrically neutral and transparent as electrons and protons combined to form hydrogen and helium atoms. However, this transition ushered in a prolonged **Dark Ages** spanning hundreds of millions of years. During this era, the primordial fireball had dimmed and the first luminous stars had yet to ignite, leaving the cosmos in absolute darkness even as it continued its rapid expansion. Simultaneously, | ||
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