Astrophysics - How Are Gold, Silver And Bronze Created In The Universe?

Copper, which is the primary component of bronze, is created during supernova explosions at the end of the lives of massive stars, using existing nitrogen as a seed.

- Dr Chiaki Kobayashi

In astronomy, elements heavier than helium are called ‘metals’, including nitrogen. It becomes harder to form copper in ‘metal-poor’ stars that were born much earlier than the Solar System.