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g.lemaitre
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This is from Harland's the Big Bang:
Regarding the words in bold, why is that the case that if the early Universe had not been dominated by the radiation of a fireball, all of the superdense hydrogen would have been fused into helium?Peebles presented a summary of his results in a seminar at Johns Hopkins University in Baltimore, saying: (a) if the early Universe had not been dominated by the radiation of a fireball, all of the superdense hydrogen would have been fused into helium; (b) the helium abundance was a measure of the energy density at the time that the fireball ceased to be dominated by radiation: and (c) the ‘relic’ of this field should be visible as an isotropic background.@