Scientific evidence suggests that magnesium is formed by stars during the process of nuclear fusion.

Here's a breakdown:

* Stellar Nucleosynthesis: Stars generate energy through nuclear fusion, which is the process of combining lighter atomic nuclei to form heavier ones.

* Magnesium Formation: Magnesium is formed in stars through a series of fusion reactions, starting with the fusion of helium nuclei.

* Helium Burning: Stars fuse helium nuclei into carbon.

* Carbon Burning: Stars fuse carbon nuclei into heavier elements, including oxygen and magnesium.

* Supernovae: When massive stars reach the end of their lives, they explode as supernovae. These explosions release huge amounts of energy and scatter the newly formed elements, including magnesium, throughout the universe.

So, magnesium, like many other elements heavier than helium, is a product of stellar evolution.