GK
BIG BANG THEORY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Due to the way matter formed after the Big Bang, most stars in the universe are composed of approximately ____ and ____
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90% oxygen; 10% helium
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50% helium; 50% hydrogen
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75% hydrogen; 25% helium
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25% hydrogen; 75% oxygen
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Explanation:
Detailed explanation-1: -Approximately 73% of the mass of the visible universe is in the form of hydrogen. Helium makes up about 25% of the mass, and everything else represents only 2%.
Detailed explanation-2: -A: Immediately (much less than a second) after the Big Bang, the universe was both too hot and too dense for elements to form. Hydrogen didn’t appear until the universe had spread out-and subsequently cooled-enough for the first protons and neutrons, and later simple atoms, to form.
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