The very first stars in the universe were made of:
A) hydrogen and helium, 10% heavy elements.
B) hydrogen and helium.
C) hydrogen and helium, 2% heavy elements.
D) hydrogen and helium, 0.1% heavy elements.

Question

Quizplus · Accepted Answer

The very first stars in the universe were formed when clouds of gas consisting of hydrogen and helium cooled and condensed under the gravitational attraction. There were no significant amounts of heavy elements (elements beyond helium) in the early universe, so option A, C, and D are ruled out. Therefore, the best choice is B, as it correctly states that these stars were made of hydrogen and helium.

The Very First Stars in the Universe Were Made Of