Supernovae, either core collapse that that which caused the Crab Nebula (shown) or due to mergers of compact objects such as white dwarfs or neutron stars, are the source of all elements heavier than iron in the universe. #astrophoto
I enjoy all your astro toots. Just recently skimmed Current Status of r-Process Nucleosynthesis, https://arxiv.org/abs/1906.05002 , about this.
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