When a massive star collapses into a Type II supernova,elements heavier than iron are created.But the amounts of these elements that survive such the collapse are not sufficient to account for the amounts we see in the universe.Where are/were a great many of them probably produced?

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Collisions of neutron stars are thought to be responsible for the production of heavy elements such as gold, platinum, and uranium. These collisions can generate temperatures and pressures high enough to create elements beyond iron. Recent observations of gravitational waves and electromagnetic radiation from neutron star collisions have confirmed this theory.

When a Massive Star Collapses into a Type II Supernova,elements