After the explosion, those few gold atoms are cast deep into the universe where they sit in empty space for eons. Eventually, some of the atoms may join a cloud. That cloud may condense into a planet.
Once inside a planet, some of the atoms may make it near the surface where we can come and dig them up.
So every atom of gold in your wedding ring was forged in a collapsing star, and then traveled across the universe to get to your finger. All the gold we wear and all the gold we give has made this same journey.
So how many miles and how many years are represented in a ring?
Calculating the path from several supernovae around our galaxy back to our solar system, Tyson concludes, all told, it's a journey of 3 million light years.