What is the primary mechanism responsible for spreading heavy elements, like gold and uranium, into the cosmos?

Answer

The supernova blast ejecting material enriched by explosive events

The supernova blast is the crucial mechanism for spreading heavy elements created during the star's life and during the explosion itself (via the r-process) out into the interstellar medium.

What is the primary mechanism responsible for spreading heavy elements, like gold and uranium, into the cosmos?

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How Stars Die - YouTube

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