How do supernova explosions contribute material to new stars and planets?

Supernova explosions play a critical role in the chemical evolution of the universe by acting as the primary mechanism for returning heavy elements to the interstellar medium.1

Throughout their life cycles, massive stars synthesize heavy elements through successive nuclear fusion reactions, creating a layered internal structure of elements ranging from hydrogen and helium in the outer shells to iron and nickel in the core. When these stars reach the end of their evolution and explode as supernovae, they violently expel this enriched material into space.1

Once released into the interstellar medium, this matter becomes part of the reservoir of gas and dust from which future generations of stars and planets are formed. Consequently, the heavy-element content of younger stars is often greater than that of older stars, reflecting the gradual enrichment of the galaxy over time through these explosive events.1