Scientists discovered that stars in the universe are mostly composed of hydrogen and helium. The correct option is A.
What are stars?
A star is made up of gases like hydrogen and helium. They are spherical and shine from the sky. The nearest star is the sun. All other stars are very far away from the planets, that is why they seem small.
They are celestial bodies made up of hydrogen and helium, and they produce heat and energy.
Thus, the correct option is A. hydrogen and helium.
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