The most metal-poor stars are living fossils from the beginning of the universe

The most metal-poor stars are living fossils from the beginning of the universe

Our sun, like all stars, is made mostly of hydrogen and helium. They are by far the most abundant elements, formed in the early moments of the universe. But our star is also rich in other elements astronomers call metals: carbon, nitrogen, iron, gold, and more. These elements were created through astrophysical processes, such as supernovas and neutron star collisions.