Stellar compositions refer to the chemical makeup of stars, primarily determined by the elements they contain. Most stars, including our Sun, are primarily composed of hydrogen and helium, which were formed during the Big Bang. Over time, stars undergo nuclear fusion, converting hydrogen into heavier elements like carbon, oxygen, and iron. The study of stellar compositions helps astronomers understand the life cycles of stars and the evolution of galaxies. By analyzing the light emitted from stars, scientists can identify specific elements and their abundances, providing insights into the formation of the universe and the processes that govern stellar development.