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Evidence

Explanation
Abundance of hydrogen in the Universe
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Answered by GPT-4o mini
**Evidence**: Abundance of hydrogen in the Universe

**Explanation**: Hydrogen is the most abundant element in the Universe, constituting about 75% of its elemental mass. This abundance can be observed in various celestial bodies and phenomena, such as stars, where hydrogen undergoes nuclear fusion to produce helium and energy. The prevalence of hydrogen supports theories of Big Bang nucleosynthesis, indicating that the early Universe was predominantly composed of hydrogen and helium shortly after its formation. Furthermore, the distribution of hydrogen in galaxies and interstellar space aligns with models of cosmic evolution, illustrating the role of hydrogen in the formation of stars and the subsequent development of complex structures in the Universe.

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