* Fusion in Stars: Stars like our Sun fuse hydrogen into helium, helium into carbon, and so on, up to iron. This process releases energy, powering the star.
* Iron is the Limit: Iron is the most stable element in the universe. Fusing iron nuclei together *requires* energy instead of releasing it. This means stars can't continue to fuse elements beyond iron to generate energy.
* Supernova: When a massive star runs out of fuel, it collapses under its own gravity, creating a supernova explosion. The intense heat and pressure in the supernova trigger nuclear reactions that create elements heavier than iron, like gold, platinum, and uranium.
So, the answer to your question is: Elements heavier than iron are created in supernova explosions.
