Gold mine of kilonova explosions forged by neutron stars crashing together

The gold that comprises the ring on your ring, the jewelry, and the uranium used as fuel in nuclear power plants is believed to come from the violent conditions created when two ultradense dead stars called neutron stars collide. 

This collision between neutron stars also generates ripples in spacetime called gravitational waves, blasts of high-energy radiation called gamma-ray bursts, and a flash of light called a kilonova that can be detected here on Earth. Signatures from just such an event were detected on 17 August 2017.