Big Bang Nucleosynthesis: Visualisation

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Origin, Evolution and Composition of Universe 04 Jul, 2026
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Big Bang Nucleosynthesis

Slide to cool the universe and watch the first atomic nuclei form.

Cooling the Universe ЁЯМбя╕П Extremely Hot

1. The Starting Particles
Protons (+) 28 (High amount)
Neutrons (0) 4 (Limited amount)
In the beginning, there were many more protons than neutrons (ratio was roughly 7:1). Because the universe is too hot, they are bouncing around randomly and cannot stick together.
ЁЯТб UPSC Logic: If bricks are many but cement is limited, the wall will be small. Here, protons are many, but limited neutrons will restrict how much Helium can form.

 

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