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staedtler staedtler
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7 years ago
Where was most of the helium in the universe created?
A)   By nuclear reactions in the cores of stars, and was then thrown out into space by supernovae
B)   By high-energy processes during the collapse of pregalactic clouds during the formation of galaxies
C)   By nuclear reactions during the first three minutes following the Big Bang
D)   By the collision of cosmic rays with hydrogen nuclei in interstellar gas clouds
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Discovering the Universe

Discovering the Universe


Edition: 7th
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papachulopapachulo
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7 years ago
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staedtler Author
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7 years ago
On behalf of my study group and I, thank you
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