The composition of matter in the universe can be summarized by which statement?
A) All but 2% of the mass of the universe is hydrogen and helium.
B) All but 2% of the mass of the universe is hydrogen.
C) Two percent of the mass of the universe is hydrogen and helium. The rest is of heavier elements.
D) About half of the mass of the universe is in the form of rocks, molecules, and planetary material.

Question

Quizplus · Accepted Answer

The composition of the universe is predominantly hydrogen and helium, making up roughly 98% of its mass. The remaining 2% consists of heavier elements.

The Composition of Matter in the Universe Can Be Summarized