More events needed to pin down gravitational waves backstory

Astronomers seek origins of black hole pairs responsible for spacetime ripples

two black holes merging

DUOS’ DANCE   Mergers of two pairs of black holes (illustrated) showcase ability of gravitational waves as a new tool for understanding the universe. LIGO detected gravitational waves from both mergers shown, but at different times and in different parts of the sky. 

A. Simonnet/LIGO

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