Acrobatic-Secret374 t1_iyji4zp wrote
Reply to comment by KnoWanUKnow2 in Do we have any compounds or materials on Earth that compared to the rest of the universe is incredibly rare? by SwordArtOnlineIsGood
To expand on this... Virtually everything heavier than iron must be formed by stellar explosions.
Either the star explodes, or two stars collide and explode (like neutron dwarf star collisions (NS-NS) )
Iron uses more energy to fuse than it makes in fusion. So, once a star starts to make iron, it is already dying. Supernova only make a small fraction of stuff heavier than iron (5%) the rest is NS-NS collisions.
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