In a new study, astronomers have found that a small fraction of all the gold on planet Earth was likely formed in a single, catastrophic, and very weird event: The merger of 2 neutron stars. The material blasted out from the ensuing explosion mixed with the stuff that formed the Sun and planets, and, eventually, us. Literally, you and me.
Neutron gold
Neutron star collision may have seeded the solar system with gold