GK
BIG BANG THEORY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following is evidence of cooling temperatures within the universe?
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Hydrogen and helium percentages decrease as other element percentages increase.
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Abundance of hydrogen and helium today
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Cosmic radiation still present
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Weather Channel
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Explanation:
Detailed explanation-1: -Hydrogen and helium account for nearly all the nuclear matter in today’s universe. This is consistent with the standard or “big bang” model. The process of forming the hydrogen and helium and other trace constituents is often called “big bang nucleosynthesis".
Detailed explanation-2: -The early universe (left) was too hot for electrons to remain bound to atoms. The first elements-hydrogen and helium-couldn’t form until the universe had cooled enough to allow their nuclei to capture electrons (right), about 380, 000 years after the Big Bang.
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