What is created in a supernova explosion?

• A. Elements heavier than iron
• B. Only hydrogen gas
• C. Only helium gas
• D. Light elements only

Answer: (A)

In a supernova, nuclei are built under extreme heat, pressure, and a flood of neutrons, allowing nucleosynthesis to push beyond what happens in normal stellar burning. The rapid neutron-capture process creates new nuclei heavier than iron, and those newly formed heavy elements are ejected into space by the explosion. This is how fresh heavy elements—like nickel, copper, silver, gold, and many others—are forged and dispersed into the interstellar medium for future stars and planets to incorporate. Lighter elements such as hydrogen and helium are already present from earlier stages of the star’s life or from earlier epochs of the universe, so the defining production during a supernova is the creation of heavy elements beyond iron, not just the buildup of light gases.