During this time, the universe was filled with neutral hydrogen gas, and no stars had yet formed to pierce the cosmic gloom. The Accelerated Expansion and Cosmic Microwave Background In the later stages of its evolution, the universe transitioned to a period of accelerated expansion driven by dark energy.
Big Bang Theory Stages Physical Properties Shift
Galaxies formed within dark matter halos, and stars were born within these galactic nurseries. This framework describes the evolution of the universe from its initial moment of hot, dense expansion to the present day, where galaxies drift apart in a vast, cooling expanse.
Concurrently, the Cosmic Microwave Background (CMB) provides a snapshot of the universe just 380,000 years after the big bang, when temperatures cooled enough for electrons and protons to combine into neutral atoms, releasing the first light that fills the observable universe. The Dark Ages ended with the Epoch of Reionization, where the first stars and galaxies ignited, emitting ultraviolet radiation that ionized the neutral hydrogen and made the universe transparent to light, allowing the Cosmic Microwave Background radiation to travel freely.
Big Bang Theory Stages Physical Properties Shift
Nucleosynthesis and the Formation of Light Elements As the universe continued to expand, it cooled sufficiently for fundamental forces to separate and protons and neutrons to combine. Key Elemental Abundances Element Approximate Abundance Hydrogen ~75% by mass Helium ~25% by mass Lithium & Beryllium <1% by mass The Dark Ages and the First Light Following nucleosynthesis, the universe entered a period known as the Dark Ages, which lasted for millions of years.
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More perspective on Big bang theory stages can make the topic easier to follow by connecting earlier points with a few simple takeaways.
