More events needed to pin down gravitational waves backstory
Astronomers seek origins of black hole pairs responsible for spacetime ripples

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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