system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:if large atoms are caused by exploding stars in space, how can we find them here?
gpt
Earth has existed for only about a third of the age of the universe.  The two thirds before that was full of stars living, dying, exploding,  and seeding the births of new solar systems, including ours.

The matter that coalesced into our Sun and its planets (and other nearby star systems) was seeded by a supernova from an earlier star generation, and thus has a higher proportion of heavier elements.