First Cosmic Event Observed in Both Gravitational Waves and Light

About 130 million years ago, in a galaxy far away, two neutron stars collided. The cataclysmic crash produced gravitational waves, ripples in the fabric of space and time. This event is now the 5th observation of gravitational waves by the Laser Interferometer Gravitational wave Observatory (LIGO) and Virgo collaboration, and the first detected that was not caused by the collision of two black holes.

But this event — called a kilonova — produced something else too: light, across multiple wavelengths.

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