https://www.scientificamerican.com/article/scientists-trace-neutron-star-crash-that-helped-form-our-solar-system/

Astronomers are on the hunt for the remnants of the neutron-star collision that gave Earth its precious metals.

When neutron stars merge, they spew a wealth of short-lived elements into their surroundings, and these materials become part of later-forming solar systems. Now scientists are trying to close in on the merger that seeded our solar system by tracing the elements produced by the original decaying material. From that work, they believe the responsible merger occurred 100 million years before and 1,000 light-years away from the birth of our solar system.