Seven years ago, researchers with the Laser Interferometer Gravitational-Wave Observatory (LIGO) reported the first detection of gravitational waves. Now, the list of gravitational wave candidates numbers nearly 100.
And astronomers are confident they can find more of these ripples in the fabric of space-time, which are caused by the acceleration of massive objects — for example, two black holes spiraling toward each other for a cataclysmic merger.
