The result is that 23 of the mass in ordinary matter

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Unformatted text preview: gy photons would immediately break any nucleus apart. After 3 minutes, nucleosynthesis began, forming deuterium followed by Helium 3 and Helium 4. Approximately a half ­hour later, the universe cooled enough so that nuclei could no longer come together to fuse. The result is that 23% of the mass in ordinary matter went into Helium 4, nearly all the rest went into helium, with trace amounts of Lithium and other isotopes of Hydrog...
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