Most of the elements that fill up the universe (and our periodic table) come from extreme cosmic explosions. One such kablooey, the “kilonova,” yields many of the elements heavier than iron, including much of the universe’s gold. Triggering a kilonova, though, takes a specific scenario: the collision of two neutron stars, the ultradense leftovers from stars that died in supernovae. What are these collisions’ origin stories?
In a first, a study in the journal Nature has shown that a star system within the Milky Way is doomed to end in a kilonova. The system, known as CPD-29 2176, is 11,000 light-years from us in the Milky Way’s outskirts. It consists of a neutron star with a circular 60-day orbit around a hot, spinning star 18 times more massive than our…
