What are the TWO MOST abundant elements in the universe?

Question

Quizplus · Accepted Answer

The two most abundant elements in the universe are hydrogen and helium. Research has shown that hydrogen makes up about 75% of the universe, while helium makes up about 25%. Therefore, option C, hydrogen and helium, is the most appropriate answer.

Option A, hydrogen and carbon, is incorrect because carbon is relatively rare in the universe, being formed in only a few astrophysical processes.

Option B, hydrogen and oxygen, is also not correct because oxygen is created mostly in stars and is not abundant in the universe as a whole.

Option D, nitrogen and oxygen, is incorrect because nitrogen is relatively rare in the universe, being produced mainly by the triple-alpha process in stars.

What Are the TWO MOST Abundant Elements in the Universe