There’s gold in them thar neutron stars! That’s right, astronomers claim Earth’s gold, the stuff of wedding bands and pricey speaker wires, originated in cataclysmic collisions of exotic stars. The gold glinting on your wedding band was likely born in a cataclysmic merger of two exceedingly exotic stars, astronomers report Wednesday.
Dying stars billions of years ago cooked up most of the lighter elements in the universe, the oxygen in the air and calcium of our bones, and blasted it across the cosmos in their final explosive moments. We are stardust, as the singer Joni Mitchell put it.
But some of the heaviest atoms, including gold, defied this explanation, requiring an even more exotic origin.
A team led by Harvard astronomer Edo Berger now reports that gold is likely created as an aftereffect of the collision of two “neutron” stars. Neutron stars are themselves the collapsed remains of imploded stars, incredibly dense stellar objects that weigh at least 1.4 times as much as the sun but which are thought to be less than 10 miles wide.
While ordinary stars explode about once every century in our galaxy, Berger says, explosive collisions of two neutron stars happen only about once every 10,000 years. And it appears they spew out gold and other heavy elements in the week after their merger.