If we look back to the first generation of stars made when the Galaxy was first forming, how do they differ from stars being formed today?

Question

Quizplus · Accepted Answer

The first generation of stars were formed when the universe was young and contained only light elements such as hydrogen, helium, and a small amount of lithium. These stars did not have elements heavier than helium in their composition because those elements had not yet been formed in nucleosynthesis processes in earlier stars. Therefore, the first generation stars were made only of hydrogen and helium, and did not have the heavier elements necessary to form planets.

If We Look Back to the First Generation of Stars