Almost all metals in the universe were produced in stars through nuclear fusion. As stars died, they released these metals into their surrounding environment. These heavy elements were then incorporated into later generations of stars, which eventually exploded as supernovae and released more metals into their surroundings, and so on.
This process is known as the "metallicity cycle".
The metallicity cycle refers to the changes in the abundance of elements heavier than hydrogen and helium in the universe over time. It is driven by the formation and evolution of stars, as well as the interactions between galaxies. The cycle begins with the formation of the first generation of stars, which are typically composed of hydrogen and helium. As these stars burn their fuel, they produce heavier elements through nuclear fusion. These elements are then incorporated into the interstellar
 This process is known as the "metallicity cycle".


The metallicity cycle refers to the changes in the abundance of elements heavier than hydrogen and helium in the universe over time. It is driven by the formation and evolution of stars, as well as the interactions between galaxies. The cycle begins with the formation of the first generation of stars, which are typically composed of hydrogen and helium. As these stars burn their fuel, they produce heavier elements through nuclear fusion. These elements are then incorporated into the interstellar