Where Does Gold Come From? The Kilonova Answer
Every gold atom on Earth was forged when two neutron stars collided before our solar system formed. The 2017 kilonova GW170817 proved it.
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Journal
The Day the Universe Rang Like a Bell
On September 14, 2015, LIGO detected a ripple in spacetime from two black holes colliding 1.3 billion years ago. The story of how we learned...
Dead Stars That Tick Like Clocks and Outlast Civilizations
A collapsed star the size of a city, spinning hundreds of times per second, keeping time more precisely than atomic clocks. How pulsars work.
391 Black Hole Collisions Found — And One Is Moving the Wrong Way
LIGO's new catalog doubled gravitational-wave detections. Among them: the first black hole–neutron star merger on an elliptical orbit.