4. According to modern studies of star (and planetary system) formation, which of the following best explains why the vast majority of the mass of our solar system consists of hydrogen and helium gas?
a. Hydrogen and helium are the most common elements throughout the universe, because they were the only elements present when the universe was young
b. Hydrogen and helium are produced in stars by nuclear fusion
c. All the other elements escaped from the solar nebula before the Sun and planets formed
d. All the other elements were swept out of the solar system by the solar wind
a. Hydrogen and helium are the most common elements throughout the universe, because they were the only elements present when the universe was young
b. Hydrogen and helium are produced in stars by nuclear fusion
c. All the other elements escaped from the solar nebula before the Sun and planets formed
d. All the other elements were swept out of the solar system by the solar wind
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Answer:
A.
Explanation:
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